Comparison of the MIPS technique versus linear incision with tissue preservation in osseointegrated implants in the Ponto model®.

BACKGROUND AND OBJECTIVES: The surgery of osseointegrated implants has undergone different modifications over the years with the aim of achieving better results and facilitating the surgical technique. Today the most commonly used technique is the linear incision with tissue preservation and placement of the abutment and implant. The long-term success of this technique has served as the basis for the development of the so-called minimally invasive surgical approach (MIPS). This study compares the short-, medium- and long-term results between the classic linear incision technique and the MIPS technique. MATERIAL AND METHODS: A prospective study was conducted on patients who had an osseointegrated implant placed between February 2016 and February 2020. A total of 59 surgeries were performed, 32 surgeries according to the linear incision technique with tissue preservation and 27 with MIPS technique. Outcomes were evaluated at one week, one month and one year. RESULTS: Statistically significant differences were achieved between the 2 groups at one week after surgery. Eighty per cent of the MIPS patients had Holgers grades 0-1 compared to 35% of the linear technique patients (p = 0.001). No statistically significant differences were observed at one month (p = 0.457) and one year (p = 0.228). One case with grade 4 was recorded which resulted in implant extrusion one month after surgery with the MIPS technique. A new osseointegrated implant was placed 2 months after the fall using the same MIPS technique with good results. We were also able to verify that the duration of surgery was much shorter with the MIPS technique and better tolerated in terms of postoperative discomfort by the patient. CONCLUSIONS: In our experience, the MIPS technique is the technique of choice for surgery of osseointegrated Ponto model implants as it is simpler, faster and presents fewer problems in the immediate postoperative period, with similar long-term postoperative results.

C1–C2 intraarticular distraction with anterior cervical cages for basilar invagination realignment: Operative technique nuances and review of literature

Neurosurgical management of basilar invagination (BI) has traditionally been aimed at direct cervicomedullary decompression through transoral dens resection or suboccipital decompression with supplemental instrumented fixation. Dr. Goel introduced chronic atlantoaxial dislocation (AAD) as the etiology in most cases of BI and described a technique for distracting the C1–C2 joint with interfacet spacers to achieve reduction and anatomic realignment. We present our modification to Goel’s surgical technique, in which we utilize anterior cervical discectomy (ACD) cages as C1–C2 interfacet implants. A young adult male presented to our institution with BI, cervicomedullary compression, occipitalization of C1, and Chiari 1 malformation. There was AAD of C1 over the C2 lateral masses. This reduced some with preoperative traction. He underwent successful C1–C2 interfacet joint reduction and arthrodesis with anterior cervical discectomy (ACD) cages and concomittant occiput to C2 instrumented fusion. BI can be effectively treated through reduction of AAD and by utilizing ACD cages as interfacet spacers. (AU)

El tratamiento neuroquirúrgico tradicional para la impresión basilar es principalmente a través de un abordaje trans-oral para la resección del proceso odontoide, seguido de una descompresión suboccipital con instrumentación posterior cervical. Dr. Goel presenta la dislocación atlanto-axial (AA) como una de las etiologías principales en los casos de impresión basilar. A su vez, describió la técnica quirúrgica que incluye la distracción de la articulación AA con cajas para fusión permitiendo la reducción y reajuste anatómico cervical. En este artículo presentamos una variación a la técnica quirúrgica del Dr. Goel en el cual utilizamos implantes utilizados en la discectomía y fusión cervical anterior (DFCA) para la articulación facetaria de C1–C2. Presentamos un paciente adulto masculino que evaluamos en nuestra institución con impresión basilar, compresión cérvico-medular, fusión occipital con el atlas y malformación de Chiari tipo 1. En adición, el paciente tenía evidencia radiográfica de dislocación AA. Se logro obtener reducción mínima de la impresión basilar con tracción cervical pre-operatoria. Luego, se sometió al tratamiento quirúrgico que consistió en el uso de implantes cervicales para la reducción y fusión de la articulación facetaria de C1–C2 complementado por instrumentación y fusión craneocervical. Esta técnica presentada sugiere que la reducción y reajuste anatómico cervical de la dislocación AA con implantes utilizados para DFCA puede ser efectivo para el tratamiento de impresión basilar. (AU)

Acute mastoiditis in cochlear implanted children: A single-centre experience / La mastoiditis aguda en niños con implante coclear: experiencia de un solo centro

Background Acute mastoiditis (AM) is the most common complication of acute otitis media and primarily affects children under the age of two; current data on its prevalence in paediatric patients with cochlear implant (CI) are still scant. Proper management of AM in CI children is crucial in order to avoid the implications (financial and emotional) of an explant. Aim of this paper is to describe the cases of AM occurred among young patients with CI in follow up at our department, also in order to evaluate its prevalence, potential predisposing factors, clinical course and therapeutic strategies. Patients and methods Retrospective study. Medical records of all paediatric patients with CI, who had at least one year of follow-up, were searched aiming to identify those who developed AM, from January 1st 2002 to January 31st 2022. The following data were collected and analysed: demographic features, implant type and side, interval between CI surgery and AM, treatment, laboratory tests, clinical course, vaccination history, associated diseases. Results AM was developed by six (1.3%) of the 439 children with CI (541 implanted ears). In total, 9 episodes (2.05 %) were recorded, as three patients reported two consecutive infections. Average time interval between CI surgery, to the first or only AM diagnosis, was 13.8 months (range 3–30 months). Furthermore, 3/6 of patients had a history of recurrent acute otitis media; 2/6 an autism spectrum disorder, associated to a combined immune deficiency in one case. All patients were hospitalized and promptly treated by intravenous antibiotic therapy; 4/6 also underwent a mastoidectomy. CI was not explanted in any cases of this series. Conclusions Over a 20-year period, AM rate in CI children was 1.3%, which is consistent with the current literature rates of 1–4.7%. All cases were successfully treated, preserving the integrity of the device. ... (AU)

Introducción La mastoiditis aguda (MA) es la complicación más común de la otitis media aguda y afecta principalmente los niños menores de dos años; los datos actuales sobre su prevalencia en pacientes pediátricos con implante coclear (IC) son aún escasos. El manejo adecuado de la MA en los niños con IC es crucial para evitar las implicaciones (económicas y emocionales) de un explante. El objetivo de este articulo es describir los casos de MA ocurridos en pacientes jóvenes con IC en seguimiento en nuestro servicio, también para evaluar su prevalencia, posibles factores predisponentes, curso clínico y estrategias terapéuticas. Pacientes y métodos Estudio retrospectivo. Se realizaron búsquedas en las historias clínicas de todos los pacientes pediátricos con IC, que tenían al menos un año de seguimiento, con el objetivo de identificar a aquellos que desarrollaron la MA, desde el 1 de enero de 2002 hasta el 31 de enero de 2022. Se recopilaron y analizaron los siguientes datos: características demográficas, tipo de implante y lado, intervalo entre cirugia del IC y MA, tratamiento, exámenes de laboratorio, evolución clínica, antecedentes vacunales, enfermedades asociadas. Resultados La MA fue desarrollada por seis (1,3%) de los 439 niños con IC (541 oídos implantados). En total se registraron 9 episodios (2,05 %), ya que tres pacientes reportaron dos infecciones consecutivas. El intervalo de tiempo promedio entre la cirugía del IC y el primer o único diagnóstico de la MA fue de 13,8 meses (rango 3-30 meses). Además, 3/6 de los pacientes tenían antecedentes de otitis media aguda recurrente; 2/6 un trastorno del espectro autista, asociado a una inmunodeficiencia combinada en un caso. Todos los pacientes fueron hospitalizados y tratados de inmediato con terapia antibiótica intravenosa; 4/6 también se sometieron a una mastoidectomía. El IC no fue explantado en ningún caso de esta serie. Conclusiones ... (AU)

Variación de la impedancia eléctrica a lo largo de cinco años postimplantación y relación con el umbral de confort máximo (MCL) en adultos portadores de implante coclear / Variation of electrical impedance over 5 years post-implantation and relationship with the maximum comfort level (MCL) in adults with cochlear implants

Introducción El umbral de confort máximo o maximum comfort level (MCL), umbral eléctrico o threshold level (THR) e impedancia eléctrica cambian en el postoperatorio del implante coclear durante meses hasta estabilizarse. El objetivo de este artículo es establecer la variación durante cinco años posquirúrgicos de la impedancia, y su relación con MCL en adultos implantados unilateralmente. Métodos Estudio retrospectivo a cinco años, con 78 pacientes adultos implantados con MED-EL en un hospital terciario desde el año 2000 hasta 2015. Se analizó la variación de impedancia, MCL y relación entre ellos, en electrodos basales (9-12), medios (5-8) y apicales (1-4), realizando análisis inferencial ANOVA de medidas repetidas con comparaciones entre tiempos consecutivos, corregidas con criterio Bonferroni. Resultados Treinta y tres hombres (42,3%) y 45 mujeres (57,7%), con edad media 52,7 ± 14,6 años. Se consideró «estabilidad» el momento del seguimiento sin diferencias estadísticamente significativas entre una visita y la siguiente. Los cambios en la impedancia en electrodos medios dejaron de ser estadísticamente significativos a los tres meses, y en apicales a los seis meses, con valores medios de 5,84 y 6,43 kohms. MCL se estabilizó a los dos años en electrodos basales y apicales, y a los tres años en medios, con valores medios de 24,9, 22,7 y 25,6 qu. Hubo correlación entre MCL e impedancia en electrodos medios hasta 3 meses y en apicales hasta un año. Conclusiones La impedancia eléctrica desciende significativamente en electrodos medios y apicales hasta tres y seis meses. El MCL aumenta significativamente hasta dos años. La impedancia se relaciona con MCL hasta seis meses. (AU)

Introduction The maximum comfort level (MCL), threshold level (THR) and electrical impedance change in the postoperative period of the cochlear implant for months until they stabilize. The objective of this article is to establish the variation during 5 post-surgical years of impedance, and its relationship with MCL in unilaterally implanted adults. Methods Retrospective study over 5 years, with 78 adult patients implanted with MED-EL in a tertiary hospital from the year 2000 to 2015. The variation in impedance, MCL and the relationship between them were analyzed in basal (9-12), medial (5-8) and apical electrodes (1-4), performing an inferential ANOVA analysis of repeated measures with comparisons between consecutive times, corrected with Bonferroni criteria. Results 33 men (42.3%) and 45 women (57.7%), with a mean age of 52.7 ± 14.6 years. “Stability” was considered the time of follow-up without statistically significant differences between one visit and the next. Changes in impedance in medial electrodes ceased to be statistically significant at 3 months, and in apicals at 6 months, with mean values of 5.84 and 6.43 kohms. MCL stabilized at 2 years in basal and apical electrodes, and at 3 years in medial, with mean values of 24.9, 22.7, and 25.6 qu. There was a correlation between MCL and impedance in medium electrodes up to 3 months and in apical ones up to one year. Conclusions Electrical impedance drops significantly in medial and apical electrodes up to 3 and 6 months. MCL increases significantly up to two years. Impedance is related to MCL up to 6 months. (AU)

Carbohydrate antigen 125-guided pre-TAVI medical optimization: impact on quality of life and clinical outcomes.

INTRODUCTION AND OBJECTIVES: Carbohydrate antigen 125 (CA125), a biomarker associated with fluid overload, has proven useful in managing diuretic therapy in heart failure. We aimed to evaluate the impact of diuretic optimization guided by CA125 before transcatheter aortic valve implantation (TAVI) on outcomes. METHODS: This prospective interventional study enrolled patients scheduled for TAVI, in whom baseline CA125 was measured 2 weeks before TAVI. Patients with CA125 ≥ 20 U/mL underwent diuretic up-titration before TAVI. Three groups were included: group I) baseline CA125 <20 U/mL; IIa) CA125 ≥ 20 U/mL that decreased after treatment, and IIb) CA125 ≥ 20 U/mL that did not decrease. The primary outcome was changes in the Kansas City Cardiomyopathy Questionnaire at 3 and 12 months. The secondary endpoint was clinical events. RESULTS: The study included 184 patients (115 group I, 46 IIa, and 23 IIb). Groups I and IIa exhibited early and sustained improvements in the Kansas City Cardiomyopathy Questionnaire (group I: 18.9 points [95%CI, 15.7-22.1; P <.001] at 90 days, and 18.1 [95%CI, 14.9-21.4, P <.001] at 1 year; group IIa: 21.1 points [95%CI, 15.4-26.7; P <.001] and 19.5 [95%CI, 13.9-25.1; P <.001] respectively). In contrast, in group IIb there was no significant improvement at 90 days (P=.12), with improvement being significant only at 1 year (17.8 points, 95%CI, 5.9-29.6; P=.003). Over a median follow-up of 20.7 months, there were 63 (27.83%) deaths or heart failure admissions. Multivariate analysis showed a lower risk of events in group I vs IIb (HR, 0.28; 95%CI, 0.14-0.58; P <.001), and IIa vs IIb (HR, 0.24; 95%CI, 0.11-0.55; P <.001). CONCLUSIONS: Patients with persistently high CA125 despite diuretic therapy pre-TAVI showed slower functional recovery and poorer clinical outcomes after TAVI.

Clinical experience with the Nurotron™ cochlear implant in a Spanish-speaking postlingual population: Clinical safety and audiological results.

OBJECTIVE: to assess clinical safety and postoperative audiological outcomes in postlingual deafness Spanish speaking patients, who underwent surgery with Nurotron™ cochlear implant. MATERIAL AND METHODS: Retrospective descriptive case series study. We performed follow-up of complications and audiological measurements before and after cochlear implantation. Patients with bilateral severe to profound sensorineural hearing loss or patients with unilateral deafness with/without tinnitus were included. Repeated-measures within-subjects for assess pure tone thresholds and speech performance (bilingual test) with a detailed monitoring to establish security or adverse effects were performed. Analysis of variance tests, repetitive measures, were used for statistical analysis. RESULTS: 31 patients were included, 17 (54.8%) men and 14 (45.2%) women. Mean age at the time of surgery was 49.82 ±â€¯18.8 years. The mean follow-up of the group was 31.56 ±â€¯9.57 months (minimum = 19.6 months and maximum = 52.50 months). As major complication one patient (3.23%) had a hard failure that required removal and re-implantation. 25.8% of the patients presented minor complications, the most frequent being vertigo/unsteadiness in 22.6%. The mean of language discrimination (free field at 65 dB SPL) was 62.19% ±â€¯16.66; being 69.82% ±â€¯7.35 in the group of severe to profound bilateral sensorineural hearing loss. A statistically significant reduction was observed in patients with tinnitus, assessed using the visual analogue scale, preoperative = 7.2 ±â€¯1,6 vs postoperative (18months postoperative) = 1.7 ±â€¯1.3 (p < .001). CONCLUSIONS: The Nurotron™ cochlear implant shows satisfactory audiological results, in accordance with what has been reported in the literature. Minor complications were similar to previous studies, but the percentage of hard failure should continue to be observed, which was higher than other reports with comparable follow-up.

Variation of electrical impedance over 5 years post-implantation and relationship with the maximum comfort level (MCL) in adults with cochlear implants.

INTRODUCTION: The maximum comfort level (MCL), threshold level (THR) and electrical impedance change in the postoperative period of the cochlear implant for months until they stabilize. The objective of this article is to establish the variation during 5 post-surgical years of impedance, and its relationship with MCL in unilaterally implanted adults. METHODS: Retrospective study over 5 years, with 78 adult patients implanted with MED-EL in a tertiary hospital from the year 2000 to 2015. The variation in impedance, MCL and the relationship between them were analyzed in basal (9-12), medial (5-8) and apical electrodes (1-4), performing an inferential ANOVA analysis of repeated measures with comparisons between consecutive times, corrected with Bonferroni criteria. RESULTS: 33 men (42.3%) and 45 women (57.7%), with a mean age of 52.7±14.6 years. "Stability" was considered the time of follow-up without statistically significant differences between one visit and the next. Changes in impedance in medial electrodes ceased to be statistically significant at 3 months, and in apicals at 6 months, with mean values of 5.84 and 6.43kΩ. MCL stabilized at 2 years in basal and apical electrodes, and at 3 years in medial, with mean values of 24.9, 22.7, and 25.6qu. There was a correlation between MCL and impedance in medium electrodes up to 3 months and in apical ones up to one year. CONCLUSIONS: Electrical impedance drops significantly in medial and apical electrodes up to 3 and 6 months. MCL increases significantly up to two years. Impedance is related to MCL up to 6 months.

C1-C2 intraarticular distraction with anterior cervical cages for basilar invagination realignment: Operative technique nuances and review of literature.

Neurosurgical management of basilar invagination (BI) has traditionally been aimed at direct cervicomedullary decompression through transoral dens resection or suboccipital decompression with supplemental instrumented fixation. Dr. Goel introduced chronic atlantoaxial dislocation (AAD) as the etiology in most cases of BI and described a technique for distracting the C1-C2 joint with interfacet spacers to achieve reduction and anatomic realignment. We present our modification to Goel's surgical technique, in which we utilize anterior cervical discectomy (ACD) cages as C1-C2 interfacet implants. A young adult male presented to our institution with BI, cervicomedullary compression, occipitalization of C1, and Chiari 1 malformation. There was AAD of C1 over the C2 lateral masses. This reduced some with preoperative traction. He underwent successful C1-C2 interfacet joint reduction and arthrodesis with anterior cervical discectomy (ACD) cages and concomittant occiput to C2 instrumented fusion. BI can be effectively treated through reduction of AAD and by utilizing ACD cages as interfacet spacers.

Self-expanding TAVI using the cusp overlap technique versus the traditional technique: electrocardiogram changes and 1-year cardiovascular outcomes.

INTRODUCTION AND OBJECTIVES: Transcatheter aortic valve implantation (TAVI) using the cusp overlap technique (COT) has shown a lower pacemaker implantation rate at 30 days. The objective of this study was to compare electrocardiogram changes and clinical outcomes between COT and the traditional technique (TT) at 1 year of follow-up. METHODS: Observational, retrospective, nonrandomized study of consecutive patients undergoing TAVI between January 2015 and January 2021. Patients were matched using a propensity score and the TT was compared with COT. The primary endpoints were electrocardiogram changes and a combined endpoint including pacemaker implantation, hospitalization, or cardiovascular death at 1 year. RESULTS: We included 254 patients. After propensity score matching, 184 patients (92 per group) remained. There were no statistically significant differences in baseline characteristics. At 1 year, COT patients showed a significant reduction in new onset left bundle branch block (49% vs 27%, P=.002) and less P wave (13.1±21.0 msec vs 5.47±12.5 msec; P=.003) and QRS prolongation (29.77±27.0 msec vs 16.38±25.4 msec, P <.001). COT was associated with a significant reduction in the occurrence of the primary endpoint (SHR, 0.39 [IC95%, 0.21-0.76]; P=.005). CONCLUSIONS: At 1 year of follow-up, COT reduced the incidence of new onset left bundle branch block and diminished QRS and P wave widening compared with the TT. COT was also associated with a statistically significant reduction in the occurrence of the combined primary cardiovascular endpoint.

Acute mastoiditis in cochlear implanted children: A single-centre experience.

BACKGROUND: Acute mastoiditis (AM) is the most common complication of acute otitis media and primarily affects children under the age of two; current data on its prevalence in paediatric patients with cochlear implant (CI) are still scant. Proper management of AM in CI children is crucial in order to avoid the implications (financial and emotional) of an explant. Aim of this paper is to describe the cases of AM occurred among young patients with CI in follow up at our department, also in order to evaluate its prevalence, potential predisposing factors, clinical course and therapeutic strategies. PATIENTS AND METHODS: Retrospective study. Medical records of all paediatric patients with CI, who had at least one year of follow-up, were searched aiming to identify those who developed AM, from January 1st 2002 to January 31st 2022. The following data were collected and analysed: demographic features, implant type and side, interval between CI surgery and AM, treatment, laboratory tests, clinical course, vaccination history, associated diseases. RESULTS: AM was developed by six (1.3%) of the 439 children with CI (541 implanted ears). In total, 9 episodes (2.05 %) were recorded, as three patients reported two consecutive infections. Average time interval between CI surgery, to the first or only AM diagnosis, was 13.8 months (range 3-30 months). Furthermore, 3/6 of patients had a history of recurrent acute otitis media; 2/6 an autism spectrum disorder, associated to a combined immune deficiency in one case. All patients were hospitalized and promptly treated by intravenous antibiotic therapy; 4/6 also underwent a mastoidectomy. CI was not explanted in any cases of this series. CONCLUSIONS: Over a 20-year period, AM rate in CI children was 1.3%, which is consistent with the current literature rates of 1-4.7%. All cases were successfully treated, preserving the integrity of the device. In our experience, the early parenteral antibiotic therapy and, when necessary, surgical treatment were adequate to eradicate the infection.

Complexos polieletrólitos de quitosana e xantana carregados com ativos naturais e sintéticos: estudo físico/químico e microbiológico para aplicação de drug delivery / Polyelectrolyte complexes of chitosan and xanthan loaded with natural and synthetic actives: physicochemical and microbiological study for drug delivery application

A eficácia dos implantes osseointegrados é amplamente reconhecida na literatura científica. Contudo, infiltrações bacterianas na junção implante-pilar podem desencadear inflamação nos tecidos circundantes, contribuindo para a evolução de condições mais sérias, como a peri-implantite. O objetivo desse estudo foi produzir complexos polieletrólitos (PECs) de quitosana (Q) e xantana (X) em forma de membranas, carregá-las com ativos naturais e sintéticos antimicrobianos, caracterizálas estruturalmente e avaliá-las frente a degradação enzimática, cinética de liberação e ações antimicrobianas com finalidade de aplicação para drug delivery. Membranas de QX a 1% (m/v) foram produzidas em três proporções, totalizando doze grupos experimentais: QX (1:1); QX (1:2), QX (2:1), QX-P (com própolis) (1:1); QX-P (1:2); QX-P (2:1); QX-C (com canela) (1:1); QX-C (1:2); QX-C (2:1) e CLX (com clorexidina 0,2%) (1:1); CLX (1:2); CLX (2:1). Para os estudos de caracterização foram feitas análises da espessura em estado seco; análises morfológicas superficial e transversal em Microscopia Eletrônica de Varredura (MEV); análise estrutural de espectroscopia de infravermelho por transformada de Fourier (FTIR); análise de degradação por perda de massa sob ação da enzima lisozima; e análise da cinética de liberação dos ativos em saliva artificial. Para os testes microbiológicos, análises de verificação de halo de inibição e ação antibiofilme foram feitas contra cepas de Staphylococcus aureus (S. aureus) e Escherichia coli (E. coli). Os resultados demonstraram que a espessura das membranas variou conforme a proporção, sendo que o grupo QX (1:2) apresentou a maior média de 1,022 mm ± 0,2, seguida respectivamente do QX (1:1) com 0,641 mm ± 0,1 e QX (2:1) com 0,249 mm ± 0,1. Nas imagens de MEV é possível observar uma maior presença de fibras, rugosidade e porosidade nos grupos QX (1:2) e QX (1:1) respectivamente, e, no QX (2:1) uma superfície mais lisa, uniforme e fina. No FTIR foram confirmados os picos característicos dos materiais isoladamente, além de observar as ligações iônicas que ocorreram para formação dos PECs. Na análise de degradação, os grupos com ativos naturais adicionados tiveram melhores taxas de sobrevida do que os grupos QX. No teste de liberação, os grupos QX-P tiveram uma cinética mais lenta que os QX-C, cuja liberação acumulada de 100% foi feita em 24 h. Já nos testes do halo inibitório, somente os grupos CLX tiveram ação sobre as duas cepas, e os QX-P tiveram sobre S. aureus. Nas análises antibiofilme, os grupos CLX apresentaram as maiores taxas de redução metabólica nas duas cepas (± 79%); os grupos QX-P apresentaram taxas de redução similares em ambas as cepas, porém com percentual um pouco maior para E. coli (60- 80%) e os grupos QX-C tiveram grande discrepância entre as duas cepas: de 35 a 70% para S. aureus e 14 a 19% para E. coli. Pode-se concluir que, frente as análises feitas, o comportamento do material foi afetado diretamente pelos ativos adicionados a matriz polimérica. As proporções de Q ou X afetaram somente a espessura final. Quanto a aplicação proposta de drug delivery, os dispositivos apresentaram grande potencial, principalmente os grupos CLX e QX-P. (AU)

The effectiveness of osseointegrated implants is widely recognized in scientific literature. However, bacterial infiltrations at the implant-abutment interface may trigger inflammation in surrounding tissues, contributing to the development of more serious conditions, such as peri-implantitis. The aim of this study was to produce chitosan (Q) and xanthan (X) polyelectrolyte complexes (PECs) in the form of membranes, load and evaluate them for enzymatic degradation, release kinetics, and antimicrobial actions for drug delivery applications. QX membranes at 1% (w/v) were produced in three proportions, totaling twelve experimental groups: QX (1:1), QX (1:2), QX (2:1), QX-P (with propolis) (1:1), QX-P (1:2), QX-P (2:1), QX-C (with cinnamon) (1:1), QX-C (1:2), QX-C (2:1), and CLX (with 0.2% chlorhexidine) (1:1), CLX (1:2), CLX (2:1). Characterization studies included analyses of dry state thickness, surface and crosssectional morphology using Scanning Electron Microscopy (SEM), structural analysis by Fourier Transform Infrared (FTIR) spectroscopy, mass loss degradation analysis under lysozyme action, and active release kinetics analysis in artificial saliva. Microbiological tests included verification analyses of inhibition halos and antibiofilm action against strains of Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). Results showed that membrane thickness varied according to proportion, with group QX (1:2) presenting the highest average of 1.022 mm ± 0.2, followed by QX (1:1) with 0.641 mm ± 0.1, and QX (2:1) with 0.249 mm ± 0.1. SEM images showed greater presence of fibers, roughness, and porosity in groups QX (1:2) and QX (1:1) respectively, while QX (2:1) exhibited a smoother, more uniform, and thinner surface. FTIR confirmed characteristic peaks of the materials individually, besides showing ionic bonds formed for PECs. Degradation analysis revealed that groups with added natural actives had better survival rates than QX groups. In release tests, QX-P groups exhibited slower kinetics than QX-C, with 100% cumulative release achieved in 24 h. inhibitory halo tests, only CLX groups exhibited action against both strains, while QX-P acted against S. aureus. Antibiofilm analyses showed CLX groups with the highest metabolic reduction rates in both strains (± 79%); QX-P groups showed similar reduction rates in both strains, slightly higher for E. coli (60-80%), and QX-C groups had a significant discrepancy between strains: 35-70% for S. aureus and 14-19% for E. coli. In conclusion, material behavior was directly affected by added actives to the polymeric matrix. Proportions of Q or X only affected final thickness. Regarding proposed drug delivery applications, the devices showed great potential, especially CLX and QX-P groups.(AU)

Stress distribution in peri-implant bone, implants, and prostheses: 3D-FEA of marginal bone loss and prosthetic design / Distribuição de estresse no osso peri-implantar, implantes e próteses: análise 3D-FEA de perda óssea marginal e design protético

Objective: In response to the demand for dental implants, extensive research has been conducted on methods for transferring load to the surrounding bone. This study aimed to evaluate the stresses on the peripheral bone, implants, and prostheses under scenarios involving of the following variables: prosthesis designs, vertical bone heights, load angles, and restorative materials. Material and Methods: Three implants were inserted in the premolar and molar regions (5-6-7) of the two mandibular models. Model 1 represented 0 mm marginal bone loss and Model 2 simulated 3 mm bone loss. CAD/CAM-supported materials, hybrid ceramic (HC), resin-nano ceramic (RNC), lithium disilicate (LiSi), zirconia (Zr), and two prosthesis designs (splinted and non-splinted) were used for the implant-supported crowns. Forces were applied vertically (90°) to the central fossa and buccal cusps and obliquely (30°) to the buccal cusps only. The stresses were evaluated using a three-dimensional Finite Element Analysis. Results: Oblique loading resulted in the highest stress values. Of the four materials, RNC showed the low stress in the restoration, particularly in the marginal area. The use of different restorative materials did not affect stress distribution in the surrounding bone. The splinted prostheses generated lower stress magnitude on the bone, and while more stress on the implants were observed. Conclusion: In terms of the stress distribution on the peri-implant bone and implants, the use of different restorative materials is not important. Oblique loading resulted in higher stress values, and the splinted prosthesis design resulted in lower stress (AU)

Objetivo: Em resposta à demanda por implantes dentários, extensa pesquisa foi realizada sobre métodos para transferir carga ao osso circundante. Este estudo buscou avaliar os estresses no osso periférico, implantes e próteses em cenários que envolvem as seguintes variáveis: designs de próteses, alturas ósseas verticais, ângulos de carga e materiais restauradores. Material e Métodos: Três implantes foram inseridos nas regiões dos pré-molares e molares (5-6-7) de dois modelos de mandíbula. O Modelo 1 representou perda óssea marginal de 0 mm e o Modelo 2 simulou perda óssea de 3 mm. Materiais suportados por CAD/CAM, cerâmica híbrida (HC), cerâmica nano-resina (RNC), dissilicato de lítio (LiSi), zircônia (Zr) e dois designs de próteses (sintetizadas e não-sintetizadas) foram utilizados para as coroas suportadas por implantes. Forças foram aplicadas verticalmente (90°) à fossa central e cúspides bucais e obliquamente (30°) apenas às cúspides bucais. Os estresses foram avaliados usando Análise de Elementos Finitos tridimensional. Resultados: Cargas oblíquas resultaram nos valores mais altos de estresse. Entre os quatro materiais, RNC mostrou baixo estresse na restauração, especialmente na área marginal. O uso de diferentes materiais restauradores não afetou a distribuição de estresse no osso circundante. Próteses sintetizadas geraram menor magnitude de estresse no osso, enquanto mais estresse nos implantes foi observado. Conclusão: Em termos de distribuição de estresse no osso peri-implantar e implantes, o uso de diferentes materiais restauradores não é crucial. Cargas oblíquas resultaram em valores mais altos de estresse, e o design de prótese sintetizada resultou em menor estresse. (AU)

Tecnologia auditiva assistiva em usuários de implante coclear em ambientes reverberantes com múltiplas fontes de ruído / Assistive listening technology in cochlear implant users in reverberant environments with multiple noise sources

RESUMO Objetivo Avaliar a contribuição da tecnologia de escuta assistida em usuários de implante coclear (IC) em situações de reverberação e ruído. Métodos Estudo transversal prospectivo aprovado pelo Comitê de Ética Institucional (CAAE 8 3031418.4.0000.0068). Foram selecionados adolescentes e adultos usuários de IC com surdez pré ou pós-lingual. Para usuários bilaterais, cada orelha foi avaliada separadamente. O reconhecimento de fala foi avaliado por meio de listas gravadas de palavras dissílabas apresentadas a 65 dBA a 0° azimute com e sem o Mini Microfone2 (Cochlear™) conectado ao processador de fala Nucleus®6. A reverberação da sala foi medida como 550 ms. Para avaliar a contribuição do dispositivo de escuta assistida (DEA) em ambiente reverberante, o reconhecimento de fala foi avaliado no silêncio. Para avaliar a contribuição do DEA em reverberação e ruído, o reconhecimento de fala foi apresentado a 0° azimute com o ruído proveniente de 8 alto-falantes dispostos simetricamente a 2 metros de distância do centro com ruído de múltiplos falantes usando relação sinal-ruído de +10dB. Para evitar viés de aprendizado ou fadiga, a ordem dos testes foi randomizada. A comparação das médias foi analisada pelo teste t para amostras pareadas, adotando-se nível de significância de p<0,005. Resultados Dezessete pacientes com idade média de 40 anos foram convidados e concordaram em participar, sendo 2 participantes bilaterais, totalizando 19 orelhas. Houve contribuição positiva significante do Mini Mic2 na reverberação e ruído+reverberação (p<0,001). Conclusão DEA foi capaz de melhorar o reconhecimento de fala de usuários de IC tanto em situações de reverberação quanto ruidosas.

ABSTRACT Purpose This study aimed to evaluate the contribution of assistive listening technology with wireless connectivity in cochlear implant (CI) users in reverberating and noise situations. Methods Prospective cross-sectional study approved by the Institutional Ethics Committee (CAAE 8 3031418.4.0000.0068). Adolescents and adults CI users with pre- or post-lingual deafness were selected. For bilateral users, each ear was assessed separately. Speech recognition was assessed using recorded lists of disyllabic words presented at 65 dBA at 0° azimuth with and without the Wireless Mini Microphone 2 (Cochlear™) connected to the Nucleus®6 speech processor. Room reverberation was measured as 550 ms. To assess the contribution of the assistive listening device (ALD) in a reverberating environment, speech recognition was assessed in quiet. To assess the contribution of the ALD in reverberation and noise, speech recognition was presented at 0° azimuth along with the noise coming from 8 loudspeakers symmetrically arranged 2 meters away from the center with multi-talker babble noise using signal to noise ratio of +10dB. To avoid learning bias or fatigue, the order of the tests was randomized. Comparison of means was analyzed by t test for paired samples, adopting significance level of p <0.005. Results Seventeen patients with a mean age of 40 years were invited and agreed to participate, with 2 bilateral participants, totaling 19 ears assessed. There was a significant positive contribution from the Mini Mic2 in reverberation, and noise+reverberation (p <0.001). Conclusion ALD was able to improve speech recognition of CI users in both reverberation and noisy situations.

Análise mecânica comparativa do destorque de parafusos de minipilar com um novo componente protético, juntamente com avaliação microbiológica do vedamento para implantes de plataforma Cone Morse / Comparative mechanical analysis of the untorsion of miniabutment screws with a new prosthetic component, together with microbiological evaluation of the seal for Cone Morse platform implants

A interface implante pilar (IAI) por se constituir de duas peças inevitavelmente apresentam micro lacuna (GAP), na qual pode ocorrer infiltração bacteriana, permitindo a penetração de microorganismos que colonizam na parte interna do implante levando ao acúmulo de biofilme e, podendo levar ao desenvolvimento da periimplantite. O desgaste da conexão interna do implante é algo que ocorre com frequência, muitas vezes pela fratura do parafuso e/ou, pela perda da rosca interna do implante. A ausência de informações prévias também pode gerar a necessidade da remoção do implante, devido a estas intercorrências, surge a possibilidade da criação de um novo componente para implantes para possibilitar a reabilitação protética, sem ter que passar por uma nova cirurgia de remoção e instalação do implante. O objetivo do trabalho foi mensurar o nível de afrouxamento do parafuso do pilar protético e do minipilar comparando com novo componente protéticos, na tentativa de simular o comportamento do conjunto implante/pilar/prótese. Foram utilizados vinte implantes de plataforma cone morse (CM) da DSP® com seus respectivos mini pilares, na qual foram distribuídos em 2 grupos(n=10): Grupo 1 - implante CM + mini pilar FlexCone® DSP + coroa simplificada pirâmide invertida carga aplicada 3 mm do centro da coroa. E Grupo 2 - implante CM + mini pilar novo + coroa simplificada pirâmide invertida carga aplicada 3 mm do centro da coroa. Foram realizados ciclagem mecânica com carga 133 N, durante 2x106 ciclos, com frequência 2 Hz e temperatura de 37ºC em ambos grupos. Um torquímetro digital foi usado para medir os valores de torque reverso do parafuso protético da coroa e também do pilar protético, antes e após o carregamento. Os resultados do modelo de regressão demonstraram diferenças estatisticamente significativas em função do envelhecimento comparando os grupos da coroa sobre o pilar protético (p = 0.020) e entre os grupos do pilar sobre o implante (p = 0.048), indicando que após o envelhecimento de 2.000.000 de ciclos ao longo do tempo está associado de maneira significativa a essas variáveis no contexto deste estudo. O segundo objetivo deste estudo foi avaliar in vitro a taxa de infiltração bacteriana através da IAI, entre o novo componente protético e a superfície interna do implante, juntamente foi analisado a permeabilidade do IAI para colonização bacteriana. Um total de oitenta implantes foram testados. As estruturas montadas para grupo 1 foi torqueado com 20 N/cm e do G2 foram torqueados com 45 N, ambos imersos em microtubos contendo 200 µl de saliva humana. Após 14 dias de incubação da amostra de bactéria nos implantes, foi realizada uma análise qPCR (reação da cadeia da polimerase em tempo real). O teste revelou que não houve diferenças estatisticamente significativas no crescimento bacteriana entre os grupos em qualquer um dos pontos temporais analisados. Conclui-se que o novo componente testado apresentou um destoque menor do que comparado ao mini pilar FlexCone DSP® e apresentou infiltração bacteriana no GAP da conexão implante-pilar semelhante comparado ao mini pilar original da empresa (AU)

The abutment implant interface (IAI), as it consists of two pieces, inevitably presents a micro gap (GAP), in which bacterial infiltration can occur, allowing the penetration of microorganisms that colonize in the internal part of the implant, leading to the accumulation of biofilm and, which can lead to development of peri-implantitis. Wear of the implant's internal connection is something that occurs frequently, often due to screw fracture and/or loss of the implant's internal thread. The lack of prior information can also generate the need to remove the implant, due to these complications, the possibility arises of creating a new component for implants to enable prosthetic rehabilitation, without having to undergo a new surgery to remove and install the implant. implant. The objective of the work was to measure the level of screw loosening of the prosthetic abutment and the mini-abutment compared with the new prosthetic component, in an attempt to simulate the behavior of the implant/ abutment/prosthesis set. Twenty DSP® morse cone (CM) platform implants were used with their respective mini pillars, which were distributed into 2 groups (n=10): Group 1 - CM implant + FlexCone® DSP mini pillar + simplified crown inverted pyramid load applied 3 mm from the center of the crown. And Group 2 - CM implant + new mini abutment + simplified crown inverted pyramid load applied 3 mm from the center of the crown. Mechanical cycling was carried out with a load of 133 N, for 2x106 cycles, with a frequency of 2 Hz and a temperature of 37ºC in both groups. A digital torque wrench was used to measure the reverse torque values of the prosthetic crown screw and also the prosthetic abutment, before and after loading. The results of the regression model demonstrated statistically significant differences as a function of aging comparing the crown-on-prosthetic abutment groups (p =0.020) and between the abutment-on-implant groups (p = 0.048), indicating that after aging 2,000 ,000 cycles over time is significantly associated with these variables in the context of this study. The second objective of this study was to evaluate in vitro the rate of bacterial infiltration through the IAI, between the new prosthetic component and the internal surface of the implant, together with the permeability of the IAI for bacterial colonization. A total of eighty implants were tested. The assembled structures for group 1 were torqued with 20 N/cm and G2 were torqued with 45 N, both immersed in microtubes containing 200 µl of human saliva. After 14 days of incubation of the bacteria sample in the implants, a qPCR (real-time polymerase chain reaction) analysis was performed. The test revealed that there were no statistically significant differences in bacterial growth between groups at any of the time points analyzed. It is concluded that the new component tested presented a lower impact compared to the FlexCone DSP® mini abutment and presented bacterial infiltration in the GAP of the implant-abutment connection similar to the company's original mini abutment.(AU)

Como a judicialização da cirurgia de implante coclear impacta o Sistema Único de Saúde / How the judicialization of cochlear implant surgery impacts the Unified Health System

RESUMO Objetivo Descrever o impacto da judicialização na realização da cirurgia de implante coclear no Sistema Único de Saúde do Brasil, incluindo o serviço público e a saúde suplementar. Métodos Foi realizado um levantamento documental de acórdãos de todos os tribunais nacionais e a jurisprudência dominante, voltados à cirurgia do implante coclear no Sistema Único de Saúde, no período de 2007 a 2019, por meio da Plataforma Jusbrasil, utilizando o termo "implante coclear" para realização da busca. Também foi realizado um levantamento na plataforma DATASUS (Departamento de Informação do Sistema Único de Saúde) sobre quantos procedimentos de implante coclear unilateral e bilateral foram realizados no mesmo período. Resultados De acordo com o DATASUS, no período de 2008 a 2019 foram realizados 8.857 procedimentos de cirurgia de implante coclear pelos entes públicos ou pelas operadoras dos planos de saúde no país. Com relação à judicialização para solicitação da cirurgia do implante coclear, unilateral ou bilateral, foram encontrados 216 processos, representando 2,43% dos casos. Conclusão A judicialização da saúde, quando se considera a cirurgia do implante coclear, tem representado uma parcela mínima dos casos, o que demonstra baixo impacto no orçamento público e não tem expressiva ação na organização do Sistema Único de Saúde.

ABSTRACT Purpose To describe the impact of Judicialization on the performance of Cochlear Implant (CI) surgery in the Brazilian Unified Health System (SUS), including the public service and supplementary health. Methods A documentary survey of judgments of all National Courts and the Dominant Jurisprudence focused on CI surgery in the SUS from 2007 to 2019 was carried out through the Jusbrasil Platform using the term "cochlear implant" to carry out the search. A survey was also carried out on the DATASUS platform on how many uni and bilateral CI procedures were performed in the same period. Results According to DATASUS, from 2008 to 2019, 8,857 CI surgery procedures were performed by Public Entities or Health Plan Operators in the country. With regard to Judicialization, for requesting unilateral or bilateral CI surgery, a total of 216 processes were found, representing a total of 2.43% of Judicialization of Cochlear Implant (CI) surgery. Conclusion In view of the data, it is possible to perceive that the Judicialization of Health when we consider the CI surgery has represented a small portion of the cases, which does not demonstrate a large impact on the public budget and does not have an impact on the organization of the SUS.

Intracorneal implantation of a misdirected foldable intraocular lens during phacoemulsification surgery: a case report / Implantação intracorneana de uma lente intraocular dobrável direcionada incorretamente durante cirurgia de facoemulsificação: relato de caso

ABSTRACT A 59-year-old man presented with a unilateral blurring of vision in his left eye. His left eye's visual acuity was hand movements level. He underwent phacoemulsification surgery, and an intrastromal posterior chamber intraocular lens was implanted. The intrastromal intraocular lens was extracted and a new intraocular lens was implanted. Usinge the Snellen chart, the final best-corrected visual acuity was 20/40. With this case report, we wish to emphasize that a single stepwise clear corneal incision merged with wound-assisted intraocular lens injections can result in intraocular lens misdirection into the corneal stroma. As a result, while performing a misdirected intraocular lens removal, we recommend that the wound be carefully constructed.

RESUMO Um homem de 59 anos apresentou embaçamento visual unilateral no olho esquerdo. Sua acuidade visual nesse olho era no nível de movimentos da mão. O paciente havia se submetido a uma cirurgia de facoemulsificação em que foi feita a implantação intraestromal de uma lente intraocular de câmara posterior. Foi feita a extração dessa lente intraestromal intraocular e uma nova lente intraocular foi implantada. A melhor acuidade visual corrigida final foi de 20/40 pela tabela de Snellen. Com este relato de caso, os autores desejam apontar que uma incisão de degrau único em córnea clara, quando combinada com a injeção de uma lente ocular através da incisão, pode levar a um direcionamento incorreto da lente intraocular para dentro do estroma corneano. Portanto, recomenda-se uma construção cuidadosa da incisão ao se remover uma lente intraocular direcionada incorretamente.

Guia para a elaboração de relatórios fonoaudiológicos de crianças implantadas: opinião de especialistas / Guide to the preparation of speech reports for implanted children: opinion of specialists

RESUMO Objetivo Desenvolver guia para elaboração de relatórios fonoaudiológicos de crianças implantadas para serem compartilhados entre fonoaudiólogos dos serviços de implante coclear (IC) e reabilitadores. Método O método Delphi foi utilizado para selecionar os itens relevantes e fundamentais que deveriam constar nas duas versões propostas para compor o guia: Guia 1 - Relatórios fonoaudiológicos fornecidos pelo serviço de IC aos reabilitadores, e Guia 2 - Relatórios fonoaudiológicos fornecidos pelos reabilitadores aos serviços de IC. Vinte e um fonoaudiólogos especialistas e com experiência na área de implante coclear e de reabilitação auditiva participaram da discussão e do julgamento dos itens durante as rodadas de seleção. Considerou-se consenso quando o item obteve a concordância igual ou superior a 80% entre os participantes, sendo selecionados para comporem os dois guias. Resultados Após as duas rodadas, 21 itens do Guia 1 obtiveram consenso entre os terapeutas, ou seja, mais de 80% deles concordaram que estes itens deveriam estar presentes no relatório enviado pelo serviço de IC. Para o Guia 2, 22 itens analisados pelos fonoaudiólogos atuantes em serviços de IC setor pós-operatório, foram selecionados na segunda rodada. Conclusão A partir da análise das duas rodadas, foi desenvolvido o "Guia para a elaboração de relatórios fonoaudiológicos: intersecção entre serviço de IC e reabilitadores". Este material pode ser aplicado na rotina de acompanhamento de crianças implantadas, padronizando as informações compartilhadas sobre o dispositivo eletrônico, resultados de avaliações, monitoramento dos resultados e processo terapêutico dessa população.

ABSTRACT Purpose To develop a guide for the preparation of speech-language reports of implanted children to be shared among speech-language pathologists of cochlear implant (CI) services and rehabilitation professionals. Methods The Delphi method was used to select the relevant and fundamental items that should be included in the two versions proposed for the guide: Guide 1 - Speech-language reports provided by the CI services to rehabilitators, and Guide 2 - Speech-language reports provided by the rehabilitators to CI services. Twenty-one speech therapists specialized and with experience in cochlear implants and auditory rehabilitation participated in the discussion and judgment of the items during the selection rounds. Consensus was considered when the item reached agreement equal to or greater than 80% among participants, being selected to compose the two guides. Results After the two rounds, 21 items from Guide 1 reached consensus among therapists, that is, more than 80% of them agreed that these items should be present in the report sent by the CI service. For Guide 2, 22 items analyzed by speech therapists working in CI services in the postoperative sector were selected in the second round. Conclusion Based on the analysis of the two rounds, the "Guide for the preparation of speech-language pathology reports: intersection between CI service and rehabilitators" was developed. This material can be applied in the follow-up of implanted children, standardizing the information shared about the electronic device, evaluation results, monitoring of results and therapeutic process of this population.

Effectiveness of endoscopy in cochlear implantation.

OBJECTIVE: Determine the effectiveness of endoscopy in cochlear implantation as compared to microscopy. METHOD: Study comparing microscopy and endoscopy in cochlear implant placement in 34 patients (23 endoscopic implants and 20 implants via microscopy), between 2014 and 2019, at the Centro Medico Naval, Mexico City. The study was performed under informed consent and according to the Council for International Organizations of Medical Sciences (CIOMS). RESULTS: Of the 34 patients, 12 were children or adolescents and 22 were adults. The visualization of the round window classified via microscopy per St. Thomas Hospital's classification showed that type IIB prevailed in 30.2% of patients, and type III in 41.9%, and when using the endoscope, the round window was observed in full in 82.6% of patients (type I), and type IIA was only observed in 17.4% (four patients). The number of attempts made to place the cochlear implant was greater with the microscope. The time to insertion of the electrode was 1.6 minutes. No differences were observed (p > 0.05) in the number of inpatient days. Cochleostomy was more frequent when using the microscope. CONCLUSIONS: Endoscopy is an effective resource in cochlear implantation for posterior tympanotomy, with no complications observed, offering greater safety in inserting the electrode through the round window.

OBJETIVO: Determinar la efectividad de la endoscopía en la implantación coclear en comparación con la técnica microscópica. MÉTODO: Se comparó la microscopía frente a la endoscopía en la colocación de implante coclear en 34 pacientes (23 endoscópicos y 20 microscópicos), del año 2014 al año 2019, en el Centro Médico Naval de la Ciudad de México. El estudio se realizó bajo consentimiento informado y apegado a las normas del Council for International Organizations of Medical Sciences. RESULTADOS: De los 34 pacientes, 12 eran niños o adolescentes y 22 eran adultos. La visualización de la ventana redonda fue clasificada con microscopio según la clasificación del St. Thomas Hospital, predominando la tipo IIB (30.2%) y la III (41.9%), y al utilizar el endoscopio se observó completa en el 82.6% (tipo I) y tipo IIA en tan solo el 17.4% (cuatro pacientes). El número de intentos en la colocación del implante coclear fue mayor con el microscopio. El tiempo en el que se insertó el electrodo fue de 1.6 minutos. No hubo diferencias (p > 0.05) en la estancia hospitalaria. Fue más frecuente la cocleostomía cuando se uso el microscopio. CONCLUSIONES: La endoscopía es un instrumento efectivo en la implantación coclear por timpanotomía posterior, sin presentarse complicaciones y dando mayor seguridad para insertar el electrodo por la ventana redonda.

Elevación de seno transcrestal con inserción de implantes ultracortos de 4.5 mm de longitud en zonas maxilares posteriores con hueso residual menor o igual a 3 mm de altura / Transcrestal sinus lift with insertion of 4.5 mm long ultrashort implants in posterior maxillary areas with residual bone less than or equal to 3 mm in height

Introducción: La atrofia posterior del maxilar con la neumatización del seno maxilar es un problema frecuente. Los protocolos para rehabilitar esta zona han ido cambiando desde la elevación de seno convencional, hasta la elevación transcrestal. Aun así, existen casos con un volumen óseo disponible en altura muy disminuido que precisan de nuevos procedimientos como los implantes de 4,5 mm. En la siguiente serie de casos clínicos se muestran pacientes tratados con este procedimiento. Material y métodos: Se presenta un estudio retrospectivo en el que se han evaluado implantes de 4,5 mm de longitud, insertados en sectores posteriores maxilares con una altura ósea residual igual o menor a 3 mm, realizándose al mismo tiempo una elevación de seno transcrestal. Posteriormente, se realiza un seguimiento radiográfico estimándose la pérdida ósea crestal y la supervivencia de los implantes.La variable principal fue la supervivencia del implante y como variables secundarias se registraron la pérdida ósea mesial y distal. Resultados: Fueron reclutados 13 pacientes en los que se insertaron 15 implantes. La media de la altura inicial de la cresta, en el estudio fue de 2,85 mm (+/- 0,20) con un rango entre 2,50 y 3 mm. Los implantes presentaron un seguimiento medio de 13,33 meses tras la carga (+/- 3,09) no encontrándose complicaciones ni fracasos durante este tiempo, por lo que la supervivencia fue del 100%. Conclusiones: Los datos preliminares obtenidos en el presente estudio muestran una alternativa a la elevación de seno mediante ventana lateral con una menor morbilidad para los pacientes. (AU)

Introduction: PPosterior maxillary atrophy with pneumatization of the maxillary sinus is a common problem. The protocols for rehabilitating this area have changed from conventional sinus lift to transcrestal lift. Even so, there are cases with a very low available bone volume in height that require new procedures such as 4.5 mm implants. The following case series shows patients treated with this procedure. Material and methods: A retrospective study is presented in which 4.5 mm long implants inserted in maxillary posterior sectors with a residual bone height equal to or less than 3 mm were evaluated and a transcrestal sinus lift was performed at the same time. Subsequently, a radiographic follow-up was carried out, estimating crestal bone loss and implant survival. The primary variable was implant survival and mesial and distal bone loss were recorded as secondary variables. Results: Thirteen patients were recruited and 15 implants were inserted that met the previously established inclusion criteria. The mean initial ridge height where the implants included in the study were placed was 2.85 mm (+/- 0.20) with a range between 2.50 and 3 mm. No complications related to the surgery were reported in any of the cases. The implants had a mean follow-up of 13.33 months after loading (+/- 3.09) with no complications or failures during this follow-up time, so survival was 100%. Conclusions: Preliminary data obtained in the present study show a predictable alternative to lateral window sinus lift with less morbidity for patients. (AU)

Retratamiento multidisciplinar de una agenesia de un incisivo lateral superior con un implante cerámico monobloque. A propósito de un caso clínico / Multidisciplinary re-treatment of an agenesis of an upper lateral incisor with an one-piece ceramic implant. A clinical report

Introducción: Los implantes dentales de circona son una buena opción terapéutica que surge como alternativa a los implantes dentales convencionales de titanio, dadas sus excelentes propiedades de biocompatibilidad, baja acumulación de placa bacteriana y escaso infiltrado inflamatorio. El objetivo del presente caso clínico es describir la colocación de un implante monobloque de circona para reponer un incisivo lateral superior izquierdo en un paciente de 34 años de edad, para la posterior realización de una corona implantosoportada monolítica de circona. Descripción del caso: Se presenta un paciente varón de 34 años de edad, no fumador y sin antecedentes médico-quirúrgicos de interés (ASA I), que acudió a la consulta demandando una mejora en la estética de su sonrisa. El paciente presentaba una agenesia congénita en el incisivo lateral superior izquierdo que había sido tratada previamente con ortodoncia para cerrar dicho espacio. Tras el examen intraoral del paciente y el estudio radiográfico, se plantea la opción de tratamiento de abrir nuevamente el espacio mediante ortodoncia para rehabilitar la ausencia con un implante de circona, asegurando la estética que demandaba el paciente. Conclusiones: La rehabilitación mediante implantes de circona para el tratamiento de agenesias congénitas en incisivos laterales superiores, es una opción válida y efectiva, obteniendo resultados óptimos a nivel estético y funcional. Sin embargo, se necesitan más estudios clínicos con tamaños muestrales suficientes que comparen implantes de titanio y cerámicos con el fin de tener datos más concluyentes. (AU)

Introduction: Zirconia dental implants are a good therapeutic option emerging as an alternative to conventional titanium dental implants, given their excellent properties of biocompatibility, low bacterial plaque accumulation and low inflammatory infiltrate. The aim of the present clinical case is to describe the placement of a zirconia implant to replace an upper left lateral incisor in a 34-year-old patient, for the subsequent restoration of a monolithic implant-supported zirconia crown. Case description: A clinical case of a 34-year-old man is presented, nonsmoker and with no previous registered medical records (ASA I) who came to the dental clinic demanding an improvement in the aesthetics of his smile. The patient had a congenital agenesis of the left lateral incisor that had previously been treated with orthodontics to close the space. After the radiographic study and intraoral examination of the patient, the treatment option of reopening the space with a new phase of corrective orthodontics to rehabilitate the absence with a zirconia implant was proposed, ensuring the aesthetics demanded by the patient. Conclusions: Restoration using zirconia implants for the treatment of congenital agenesis in upper lateral incisors is a valid and effective option, obtaining optimal aesthetic and functional results. However, more clinical studies with sufficient sample sizes comparing titanium and ceramic implants are needed in order to have more conclusive data. (AU)