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1.
Braz Oral Res ; 34: e003, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32022222

RESUMEN

This retrospective study evaluated facial profile pleasantness determined by two protocols of Class II treatment. The sample comprised facial profile silhouettes obtained retrospectively from the pretreatment (T1) and posttreatment (T2) cephalograms of 60 patients (42 males and 18 females) divided into two groups. One group of 30 patients (mean age of 12.84 years) was treated with the extraction of maxillary first premolars (mean treatment time of 2.7 years), and the other group of 30 patients (mean age of 12.81 years) was treated with a mandibular advancement appliance (Forsus) (mean treatment time of 2.49 years). The facial profile silhouettes (T1 and T2) were randomly distributed in an album containing one patient per sheet. The examiners consisted of 60 orthodontists and 60 lay individuals, who analyzed the profiles in regard to facial pleasantness, using the Likert scale. A comparison between stages T1 and T2 of the two treatment protocols and between the examiners was performed by mixed-design analysis of variance at a significance level of 5%. The results demonstrated a significant difference between T1 and T2 (greater scores for T2 compared to T1), and between lay individuals and orthodontists (orthodontists assigned higher scores), but with no significant difference between the treatment protocols. Both protocols produced positive effects on the facial profile esthetics, from the standpoint of lay individuals and orthodontists.


Asunto(s)
Estética Dental , Cara/patología , Maloclusión de Angle Clase II/patología , Maloclusión de Angle Clase II/terapia , Extracción Dental/métodos , Adolescente , Análisis de Varianza , Diente Premolar/cirugía , Cefalometría , Niño , Femenino , Humanos , Masculino , Variaciones Dependientes del Observador , Aparatos Ortodóncicos Fijos , Ortodoncia Correctiva/métodos , Ortodoncistas , Percepción , Estudios Retrospectivos , Estadísticas no Paramétricas , Resultado del Tratamiento
2.
J Endod ; 46(1): 29-33, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-31735361

RESUMEN

INTRODUCTION: Altered sensation is a rare but disturbing adverse event after mandibular premolar and molar periapical surgery procedures, and its incidence is not known. The aim of this study was to determine the incidence of altered sensation after periapical surgery procedures in mandibular premolars and molars. METHODS: This retrospective study includes patients who received periapical surgery in endodontic clinics of a university hospital in the United States. Data were obtained by review of the records for patients who met the inclusion criteria, and statistical analysis of possible predictive factors was performed using the 2-tailed Fisher exact test (α = 0.05). RESULTS: Sixty-two patients (63 teeth, 13 premolars and 50 molars) met the inclusion and exclusion criteria and were analyzed in the study. The first follow-up visit occurred 3 to 37 days after surgery. Altered sensation was observed in 9 patients. Observation of altered sensation was significantly higher (odds ratio = 7.19) after premolar surgeries (5/13) compared with molar surgeries (4/50). CONCLUSIONS: Despite the limited size and retrospective nature of this study, it was concluded that the incidence of altered sensation after periapical surgery appears to be relatively high (14%), with a higher incidence found in premolars compared with molars.


Asunto(s)
Diente Premolar , Mandíbula , Diente Molar , Trastornos de la Sensación , Diente Premolar/cirugía , Humanos , Incidencia , Mandíbula/cirugía , Diente Molar/cirugía , Estudios Retrospectivos , Sensación , Trastornos de la Sensación/etiología
3.
Niger J Clin Pract ; 22(11): 1530-1538, 2019 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-31719274

RESUMEN

Background: Bimaxillary protrusion is a common dentofacial condition associated with proclination of maxillary and mandibular incisors in relation to the dental and cranial bases resulting in soft tissue procumbency. The present retrospective study aimed to investigate dental and soft tissue profile changes using cephalometric analysis to evaluate bimaxillary protrusion patients after extraction of the first four premolars and subsequent retraction of the anterior teeth. Materials and Methods: Pre-treatment and post-treatment cephalometric radiographs of 46 Saudi patients (16 males and 30 females), 18-30 years of age with bimaxillary protrusion, were selected based on inclusion criteria. Dental and soft tissue landmarks were traced using the Dolphin® imaging software and statistically analyzed with SPSS® 21 software. Results: The upper and lower incisors retroclined by a mean value of 9.6° and 9.65°, respectively, and an average distance of 4.1 mm. The level of maxillary incisor exposure was reduced by approximately 1.1 mm after treatment. A mean increase of 6.6° in the nasolabial angle was also observed. Multiple regression analysis showed that retraction of both upper and lower incisors by 1 mm would result in a 0.44 mm retraction of the upper and lower lips. Conclusion: A statistically significant increase in the nasolabial angle and upper lip length was found in relation to upper and lower incisor retraction and retroclination. A significant reduction was also evident in the post treatment upper incisor exposure, facial convexity angle and mentolabial sulcus depth.


Asunto(s)
Cefalometría/métodos , Cara/anatomía & histología , Incisivo/anomalías , Maloclusión/terapia , Extracción Dental , Adolescente , Adulto , Diente Premolar/cirugía , Femenino , Humanos , Incisivo/diagnóstico por imagen , Labio/anatomía & histología , Masculino , Maloclusión/etnología , Maxilar , Aparatos Ortodóncicos , Radiografía , Estudios Retrospectivos , Adulto Joven
4.
Am J Orthod Dentofacial Orthop ; 156(1): 137-147, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31256827

RESUMEN

A 16-year-old patient sought orthodontic correction for profile improvement and labially inclined maxillary incisors. She had Class II malocclusion, protrusive maxillary and mandibular incisors, and increased overjet and overbite with an American Board of Orthodontics discrepancy index value of 25. She was treated with maxillary premolar extractions and miniscrew-supported en masse retraction assisted with piezoincisions. Extraction spaces (7.5 mm per side) were closed with maximum anchorage in 10 months. Total treatment time was 23 months. Twenty-seven months after debonding, a pink spot was noted at the buccocervial region of the left central incisor. Radiographic evaluation on cone-beam computed tomographic scans revealed a severe case of invasive cervical resorption on both central incisors, around which the piezosurgical cuts had been made. Treatment proceeded with a nonintervention approach and the affected teeth were reinforced with a lingual retainer.


Asunto(s)
Maloclusión de Angle Clase II/terapia , Ortodoncia Correctiva/métodos , Sobremordida/terapia , Piezocirugía/efectos adversos , Adolescente , Diente Premolar/cirugía , Tornillos Óseos , Cefalometría , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Incisivo/diagnóstico por imagen , Incisivo/patología , Incisivo/cirugía , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/cirugía , Mandíbula , Maxilar/diagnóstico por imagen , Maxilar/patología , Maxilar/cirugía , Métodos de Anclaje en Ortodoncia/instrumentación , Métodos de Anclaje en Ortodoncia/métodos , Diseño de Aparato Ortodóncico , Aparatos Ortodóncicos , Soportes Ortodóncicos , Alambres para Ortodoncia , Sobremordida/diagnóstico por imagen , Sobremordida/cirugía , Radiografía Panorámica , Resorción Radicular/etiología , Técnicas de Movimiento Dental/métodos , Resultado del Tratamiento , Dimensión Vertical
5.
Am J Orthod Dentofacial Orthop ; 155(5): 681-692, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-31053284

RESUMEN

PURPOSE: The purpose of this study was to determine how micro-osteoperforations (MOPs) affect tooth movements, bone turnover, bone density, and bone volume. METHODS: A split-mouth experimental design with 7 beagle dogs was used to evaluate bone surrounding maxillary second premolars that had been retracted for 7 weeks. One month after the maxillary third premolars were extracted, 8 MOPs (1.5 mm wide and 7 mm deep) were created without flaps with the use of the Propel device (6 were placed 3 mm distal to the second premolar and 2 were placed in the premolar furcation) on one randomly chosen side. The maxillary second premolars were retracted bilaterally with the use of 200 g nickel-titanium closed coil springs. Tooth movements were measured intraorally and radiographically. Microscopic computed tomography was used to evaluate the material density and volume fraction of bone distal to the premolars. Hematoxylin and eosin-stained and fluorescent sections were used to examine the bone remodeling. RESULTS: Neither the intraoral (P = 0.866) nor radiographic (P = 0.528) measures showed statistically significant side differences in tooth movements. There also were no statistically significant differences in the density (P = 0.237) or volume fraction (P = 0.398) of bone through which the premolars were being moved. Fluorescent and histologic evaluations showed no apparent differences in osteoblasts, osteoclasts, or mineralization of bone near the teeth being moved. Bone healing was evident in and near the MOP sites, which had nearly but not completely healed after 7 weeks. Regions of acellular bone were evident extending ∼0.8 mm from the MOP sites. CONCLUSIONS: MOPs placed 3 mm away from teeth do not increase tooth movements and have limited and transitory effect on bone.


Asunto(s)
Prótesis Dental , Técnicas de Movimiento Dental/instrumentación , Animales , Diente Premolar/cirugía , Densidad Ósea/fisiología , Remodelación Ósea/fisiología , Diseño de Prótesis Dental , Perros , Maxilar/patología , Microtomografía por Rayos X
7.
Eur J Orthod ; 41(2): 180-187, 2019 03 29.
Artículo en Inglés | MEDLINE | ID: mdl-30668660

RESUMEN

OBJECTIVE: To analyse cost-effectiveness of anchorage reinforcement with buccal miniscrews and with molar blocks. We hypothesized that anchorage with miniscrews is more cost-effective than anchorage with molar blocks. TRIAL DESIGN: A single-centre, two-arm parallel-group randomized controlled trial. METHODS: Adolescents (age 11-19 years) in need of treatment with fixed appliance, premolar extractions, and en masse retraction were recruited from one Public Dental Health specialist centre. The intervention arm received anchorage reinforcement with buccal miniscrews during space closure. The active comparator received anchorage reinforcement with molar blocks during levelling/alignment and space closure. The primary outcome measure was societal costs defined as the sum of direct and indirect costs. Randomization was conducted as simple randomization stratified on gender. The patients, caregivers, and outcome assessors were not blinded. RESULTS: Eighty patients were randomized into two groups. The trial is completed. All patients were included in the intention-to-treat analysis. The median societal costs for the miniscrew group were €4681 and for the molar block group were €3609. The median of the difference was €825 (95% confidence interval (CI) 431-1267). This difference was mainly caused by significantly higher direct costs consisting of material and chair time costs. Differences in chair time costs were related to longer treatment duration. No serious harms were detected, one screw fractured during insertion and three screws were lost during treatment. GENERALIZABILITY AND LIMITATIONS: The monetary variables are calculated based on a number of local factors and assumptions and cannot necessarily be transferred to other countries. Variables such as chair time, number of appointments, and treatment duration are generalizable. Owing to the study protocol, the benefit of miniscrews as a stable anchorage has not been fully utilized. CONCLUSIONS: When only moderate anchorage reinforcement is needed, miniscrews are less cost-effective than molar blocks. The initial hypothesis was rejected. Miniscrews provide better anchorage reinforcement at a higher price. They should be used in cases where anchorage loss cannot be accepted. TRIAL REGISTRATION: NCT02644811.


Asunto(s)
Tornillos Óseos/economía , Métodos de Anclaje en Ortodoncia/economía , Métodos de Anclaje en Ortodoncia/instrumentación , Técnicas de Movimiento Dental/economía , Técnicas de Movimiento Dental/instrumentación , Adolescente , Citas y Horarios , Diente Premolar/cirugía , Tornillos Óseos/efectos adversos , Costo de Enfermedad , Análisis Costo-Beneficio , Femenino , Costos de la Atención en Salud/estadística & datos numéricos , Humanos , Masculino , Diente Molar , Suecia , Factores de Tiempo , Extracción Dental , Técnicas de Movimiento Dental/efectos adversos , Técnicas de Movimiento Dental/métodos , Adulto Joven
8.
J Int Med Res ; 47(1): 84-95, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30200801

RESUMEN

OBJECTIVES: The goal of this study was to analyze skeletal, dental, and soft tissue changes of patients treated with customized lingual systems and to evaluate the clinical effectiveness of miniscrew anchorage. METHODS: Nine upper first premolar extraction patients who were treated with customized lingual appliances were included in this study. Miniscrews were used for reinforcement of molar anchorage. Cephalometric films and study models were obtained before treatment (T1), after alignment (T2), and after treatment (T3). Treatment effects were analyzed by cephalometric radiographs and study models. RESULTS: The upper anterior teeth were retracted significantly at T2 and T3 (4.41 ± 4.14 mm and 5.51 ± 2.48 mm, respectively). During space closure, the upper first molars showed slight mesial movement (1.50 ± 1.97 mm). The intercanine width of the upper arch increased at T2 (1.59 ± 1.81 mm), but decreased at T3 (0.11 ± 1.00 mm). The sella-nasion-A, A-nasion-B, and mandibular plane angles were not significantly changed at T3. The upper lip showed continuous retraction at both T2 and T3 (1.40 ± 1.46 mm and 2.32 ± 2.48 mm, respectively). CONCLUSIONS: By using miniscrew anchorage for lingual orthodontics, patients' dental and soft tissue changes considerably improved and molar anchorage was reinforced.


Asunto(s)
Tornillos Óseos , Maloclusión/cirugía , Aparatos Ortodóncicos , Ortodoncia/métodos , Tratamiento de Tejidos Blandos/instrumentación , Adolescente , Adulto , Diente Premolar/cirugía , Cefalometría/métodos , Niño , Modelos Dentales , Femenino , Humanos , Masculino , Maloclusión/patología , Mandíbula/anatomía & histología , Mandíbula/cirugía , Maxilar/anatomía & histología , Maxilar/cirugía , Ortodoncia/instrumentación , Tratamiento de Tejidos Blandos/métodos , Extracción Dental
9.
Eur J Orthod ; 41(2): 188-195, 2019 03 29.
Artículo en Inglés | MEDLINE | ID: mdl-29931294

RESUMEN

BACKGROUND: No randomized controlled trial (RCT) has compared flapless piezocision-assisted corticotomy in the extraction-based orthodontic decrowding of lower anterior teeth with the conventional treatment. OBJECTIVE: To evaluate the effectiveness of flapless piezocision-assisted corticotomies in accelerating lower anterior teeth alignment. TRIAL DESIGN: A parallel-group RCT was conducted. MATERIALS AND METHODS: Thirty-six patients (mean age 20.32 ± 1.96 years) in need of orthodontic treatment with a fixed orthodontic appliance were enrolled and randomly allocated to either the experimental or the control group. Following first premolar extraction, five radiographic-guided micro incisions and localized piezoelectric corticotomies were performed on the labial surfaces of the alveolar bone between the six anterior teeth in order to accelerate alignment for patients in the experimental group, whereas those in the control group received traditional orthodontic treatment. The overall alignment time (OAT) required to complete anterior alignment of the mandibular dental arch (OAT) was measured. Little's Irregularity Index (LII) was also calculated at monthly intervals. Randomization was performed using a software-generated list of random numbers; the recruited patients were divided into two parallel groups with a 1:1 allocation ratio. Assessor blinding was employed. RESULTS: One hundred and eight severe dental crowding patients were evaluated for eligibility, 40 of them fulfilled the inclusion criteria. Thirty-six participants were allocated to the treatment groups randomly. One female patient was lost to follow-up from the control group, and another female patient was excluded from analysis for the experimental group. Accordingly, the results of 34 patients were statistically analyzed. OAT was reduced by 59% in the experimental group compared to the control group, with a statistically significant difference between the two groups (P < 0.001). No harms were encountered. CONCLUSION: Flapless piezocision technique was very effective in accelerating orthodontic tooth movement. TRIAL REGISTRATION: This trial was registered at Clinical Trials.gov (Identifier: NCT02977221).


Asunto(s)
Maloclusión/terapia , Aparatos Ortodóncicos Fijos , Piezocirugía/métodos , Técnicas de Movimiento Dental/métodos , Adolescente , Adulto , Diente Premolar/cirugía , Arco Dental/patología , Femenino , Humanos , Masculino , Maloclusión/patología , Mandíbula/cirugía , Osteotomía/métodos , Extracción Dental , Técnicas de Movimiento Dental/instrumentación , Adulto Joven
10.
J Int Med Res ; 47(1): 470-480, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30514145

RESUMEN

OBJECTIVE: The purpose of this study was to evaluate the effect of immediate and delayed post space preparation on the sealing ability of two root canal obturation techniques by using micro-computed tomography imaging and a push-out test. METHODS: The root canals of 40 human maxillary premolar teeth were instrumented and divided into four groups: (A) single cone (SC) followed by immediate post space preparation, (B) continuous wave of condensation (CWC) followed by immediate post space preparation, (C) SC followed by delayed post space preparation, and (D) CWC followed by delayed post space preparation. Micro-CT scans were performed for volumetric analysis of voids and filling materials in the apical 4-mm portion. A push-out test was performed, and failure modes (adhesive, cohesive, or mixed) were assessed. Data were analyzed using the Kruskal-Wallis test and one-way analysis of variance. RESULTS: No significant differences were observed among the four groups in terms of the percentage volume of voids of the apical 4 mm or the bond strength of apical gutta-percha. CONCLUSIONS: The percentage volume of voids and bond strength of apical gutta-percha were similar and were not significantly influenced by the timing of post space preparation or the obturation technique.


Asunto(s)
Diente Premolar/cirugía , Cavidad Pulpar/cirugía , Gutapercha/química , Obturación del Conducto Radicular/métodos , Análisis de Varianza , Diente Premolar/patología , Cavidad Pulpar/diagnóstico por imagen , Cavidad Pulpar/patología , Análisis de Falla de Equipo/métodos , Humanos , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Obturación del Conducto Radicular/instrumentación , Factores de Tiempo , Extracción Dental , Microtomografía por Rayos X
11.
Microsc Res Tech ; 82(4): 394-401, 2019 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-30575196

RESUMEN

The aim of this in vitro study was to compare the efficacies of two different fiber post-removal systems. Thirty extracted single-rooted mandibular premolar teeth were used. After RelyX fiber posts were cemented, the teeth were divided into two groups with regard to the post removal techniques: ultrasonic vibration and D.T. Light-Post removal kit. Residual material, tooth volume changes, working time and micro-crack formation were assessed using micro-computed tomography. All data were analyzed using Wilcoxon signed-rank and Mann-Whitney U tests. There was significantly more tooth root volume change in the ultrasonic group than removal kit group (p < .05). Fiber post removal time for the ultrasonic group was significantly longer than the removal kit group (p < .01).


Asunto(s)
Diente Premolar/cirugía , Tratamiento del Conducto Radicular/métodos , Raíz del Diente/cirugía , Análisis del Estrés Dental , Humanos , Mandíbula , Ultrasonido , Microtomografía por Rayos X
12.
J Prosthodont ; 28(1): e304-e309, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-29323779

RESUMEN

PURPOSE: To see whether applying four different liners under short fiber-reinforced composite (SFRC), everX Posterior, compared to conventional composite resin, Z250, affected their strengthening property in premolar MOD cavities. MATERIALS AND METHODS: Mesio-occluso-distal (MOD) cavities were prepared in 120 sound maxillary premolars divided into 10 groups (n = 12) in terms of two composite resin types and 4 liners or no liner. For each composite resin, in 5 groups no liner, resin-modified glass ionomer (RMGI), conventional flowable composite (COFL), self-adhesive flowable composite resin (SAFL), and self-adhesive resin cement (SARC) were applied prior to restoring incrementally. After water storage and thermocycling, static fracture resistance was tested. Data (in Newtons) were analyzed using two-way ANOVA (α = 0.05). RESULTS: Fracture resistance was significantly affected by composite resin type (p = 0.02), but not by the liner (p > 0.05). The interaction of the two factors was not statistically significant (p > 0.05). SFRC exhibited higher fracture strength (1470 ± 200 N) compared to conventional composite resin (1350 ± 290), irrespective of the application of liners. Application of SARC and SAFL liners led to a higher number of restorable fractures for both composite resins. CONCLUSIONS: The four liners can be used without interfering with the higher efficacy of SFRC, compared to conventional composite resins, to improve the fracture strength of premolar MOD cavities.


Asunto(s)
Diente Premolar/cirugía , Resinas Compuestas/uso terapéutico , Recubrimiento de la Cavidad Dental , Restauración Dental Permanente , Resinas Compuestas/efectos adversos , Recubrimiento de la Cavidad Dental/efectos adversos , Fracaso de la Restauración Dental , Restauración Dental Permanente/efectos adversos , Restauración Dental Permanente/métodos , Análisis del Estrés Dental , Vidrio , Humanos , Polímeros/efectos adversos , Polímeros/uso terapéutico
13.
Dental Press J Orthod ; 23(5): 82-92, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30427497

RESUMEN

The esthetic benefits are among the main goals of orthodontic treatment; therefore, tooth extractions have been avoided as a protocol for orthodontic treatment because they may impair the facial profile. The present article discusses aspects as the magnitude and response of soft tissue profile due to changes in incisor positioning, and the effect of different sequences of premolar extraction. One case report illustrates the subject, with favorable and stable esthetic and occlusal outcomes five years after orthodontic treatment with extraction of second premolars.


Asunto(s)
Diente Premolar/cirugía , Cara/anatomía & histología , Extracción Dental/efectos adversos , Adulto , Diente Premolar/diagnóstico por imagen , Cefalometría , Estética Dental , Femenino , Humanos , Maloclusión de Angle Clase I/cirugía , Fotografía Dental , Radiografía Panorámica
14.
Int Orthod ; 16(4): 665-675, 2018 12.
Artículo en Inglés | MEDLINE | ID: mdl-30385293

RESUMEN

INTRODUCTION: Different treatment protocols have been implemented for management of Class III malocclusion with aim of achieving ideal occlusal goals. The aim of current study was to compare the efficiency of Class III treatment with mandibular 2-premolar extraction and mandibular molar distalization protocol. METHODS: This retrospective cross sectional study was conducted on pre-treatment and post-treatment dental casts of 60 orthodontic patients who had Class III malocclusion and were treated with a mandibular dentition distalization and mandibular 2-premolars extraction protocol. The study was conducted at orthodontic departments of Dental Section, Faisalabad Medical University/Punjab Medical College and de'Montmorency College of Dentistry, Pakistan. The sample was classified into 2 groups. Group A consisted of 30 patients (20 females, 10 males) (mean age, 18.02years) treated with distalization protocol and Group B consisted of 30 patients (18 females, 12 males) (mean age, 18.97years) treated with mandibular 2-premolars extraction protocol. To compare the efficiency of the treatment protocol in each group, the initial and final occlusal results were assessed on dental models using PAR index while treatment efficiency was assessed using a treatment efficiency index (TX). The groups were compared with t and Mann-Whitney tests. RESULTS: There were no significant differences in the initial age, treatment time, treatment efficiency and any occlusal feature between the groups. CONCLUSION: Treatment efficiency of Class III malocclusions with mandibular 2-premolar extractions or mandibular dentition distalization protocol is similar.


Asunto(s)
Diente Premolar/cirugía , Maloclusión de Angle Clase III/terapia , Extracción Dental , Técnicas de Movimiento Dental/métodos , Adolescente , Estudios Transversales , Femenino , Humanos , Masculino , Maloclusión de Angle Clase III/cirugía , Ortodoncia Interceptiva/métodos , Estudios Retrospectivos , Resultado del Tratamiento , Adulto Joven
15.
Head Face Med ; 14(1): 17, 2018 Sep 24.
Artículo en Inglés | MEDLINE | ID: mdl-30249268

RESUMEN

BACKGROUND: Controlled space closure in cases of isolated lower second premolar aplasia (ILSPA) without maxillary counterbalancing extraction is challenging. Anterior anchorage loss may occur during space closure resulting in compromised occlusal results in terms of an absence of proper canine guidance during laterotrusive mandible movements. In order to evaluate the effectiveness of Herbst telescope anchorage in combination with double-cable, pull mechanics and a completely customized lingual appliance for orthodontic space management in cases of ILSPA, we tested the null hypothesis that there is a significant deterioration in the sagittal canine relationship towards an Angle-Class-II occlusion expressed as a loss of anterior anchorage following space closure with molar mesialization. METHODS: Twenty-five consecutively de-bonded subjects (female / male 17 / 8; aged at T0 (start of MB Tx) 12.3 to 20.6 years; mean age 15.0 / SD 1.7 years) were included in this retrospective analysis using the inclusion criteria of least of one lower second premolar aplasia; completed treatment with a totally customized lingual appliance (CCLA) in combination with Herbst telescopes. Exclusion criteria were the absence of counterbalancing maxillary extractions, as well as additional tooth aplasia other than lower second premolars. A total of 33 single, lower premolar aplasia space closures (right / left sided 17 / 16) were assessed using plaster casts and intra-oral photographs scaled to the plaster casts, at bonding (T0), Herbst insertion (T1), following gap closure (T2) and de-bonding (T3). Parallelism of roots was controlled by panoramic x-rays at T3. RESULTS: The mean aplasia space at T0 was 7.5 mm (SD 2.6). Complete space closure was achieved in all 33 situations. The null hypothesis was rejected. There was a significant improvement in the initial canine relationships (mean 3.5 mm distal occlusion at T0) to a mean 0.1 mm at T3. When evaluated against the individual treatment plan, the following amounts of planned improvements were achieved: space closure 100%, canine relationship 97.5%, overjet 93.9%, overbite 96.4%, parallel roots in space closure site 93.9%. CONCLUSION: Herbst telescope anchorage in combination with double-cable pull mechanics and a CCLA for orthodontic space closure can deliver predictable, high-quality treatment results.


Asunto(s)
Diente Premolar/anomalías , Métodos de Anclaje en Ortodoncia/métodos , Aparatos Ortodóncicos Funcionales , Alambres para Ortodoncia , Anomalías Dentarias/cirugía , Adolescente , Diente Premolar/cirugía , Estudios de Cohortes , Terapia Combinada , Estética Dental , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Mandíbula/cirugía , Maxilar/anomalías , Maxilar/cirugía , Métodos de Anclaje en Ortodoncia/instrumentación , Cierre del Espacio Ortodóncico , Radiografía Panorámica/métodos , Estudios Retrospectivos , Anomalías Dentarias/diagnóstico por imagen , Extracción Dental/métodos , Resultado del Tratamiento , Adulto Joven
16.
J Clin Pediatr Dent ; 42(5): 401-405, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30222510

RESUMEN

An ankylosed primary molar may cause rotation or ectopic impaction of succedaneous premolar. When conventional treatment modalities such as observation, surgical exposure with or without orthodontic traction, and autotransplantation are not possible, the simple surgical relocation method could be an alternative treatment option for a lingually rotated premolar during the tooth germ stage before opting to extraction. In the case reported herein, the lingually rotated permanent mandibular second premolar tooth germ was surgically relocated within its bony crypt. Continued root development and spontaneous eruption were observed without complications during the 3.5-year follow-up period.


Asunto(s)
Diente Premolar/cirugía , Anquilosis del Diente/cirugía , Germen Dentario/cirugía , Preescolar , Femenino , Humanos , Diente Primario
17.
Artículo en Inglés | MEDLINE | ID: mdl-30113605

RESUMEN

The purpose of this study was to evaluate the survival of 525 composite indirect restorations in premolars and molars after a follow-up of 20 years. For each patient, the following variables were recorded and analyzed: age, sex, smoking status, presence of plaque according to O'Leary index, and presence of bruxism. For each restoration, the following variables were collected: restoration class, tooth type (premolar or molar), and restoration material. Mean 20-year survival rate of composite restorations was 57%, ranging from 44% to 75%. The Kaplan-Meier method demonstrated a probability of survival at 10 years of 80% and 90%. Surviving restorations kept their clinical characteristics extremely well, as assessed on the basis of the United States Public Health Service criteria. The results of this study demonstrate the efficacy of indirect composite restorations, confirming their reliability as a posterior prosthetic clinical option.


Asunto(s)
Resinas Compuestas/uso terapéutico , Restauración Dental Permanente/métodos , Diente Premolar/cirugía , Fracaso de la Restauración Dental , Femenino , Estudios de Seguimiento , Humanos , Estimación de Kaplan-Meier , Masculino , Persona de Mediana Edad , Diente Molar/cirugía , Estudios Retrospectivos
18.
Int J Mol Sci ; 19(9)2018 Aug 23.
Artículo en Inglés | MEDLINE | ID: mdl-30142971

RESUMEN

Periodontal disease, a chronic disease caused by bacterial infection, eventually progresses to severe inflammation and bone loss. Regulating excessive inflammation of inflamed periodontal tissues is critical in treating periodontal diseases. The periodontal ligament (PDL) is primarily a connective tissue attachment between the root and alveolar bone. PDL fibroblasts (PDLFs) produce pro-inflammatory cytokines in response to bacterial infection, which could further adversely affect the tissue and cause bone loss. In this study, we determined the ability of Litsea japonica leaf extract (LJLE) to inhibit pro-inflammatory cytokine production in PDLFs in response to various stimulants. First, we found that LJLE treatment reduced lipopolysaccharide (LPS)-induced pro-inflammatory cytokine (interleukin-6 and interleukin-8) mRNA and protein expression in PDLFs without cytotoxicity. Next, we observed the anti-inflammatory effect of LJLE in PDLFs after infection with various oral bacteria, including Fusobacterium nucleatum, Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia. These anti-inflammatory effects of LJLE were dose-dependent, and the extract was effective following both pretreatment and posttreatment. Moreover, we found that LJLE suppressed the effect of interleukin-1 beta-induced pro-inflammatory cytokine production in PDLFs. Taken together, these results indicate that LJLE has anti-inflammatory activity that could be exploited to prevent and treat human periodontitis by controlling inflammation.


Asunto(s)
Antiinflamatorios/farmacología , Fibroblastos/efectos de los fármacos , Interleucina-1beta/antagonistas & inhibidores , Lipopolisacáridos/antagonistas & inhibidores , Litsea/química , Extractos Vegetales/farmacología , Adulto , Antiinflamatorios/química , Diente Premolar/citología , Diente Premolar/cirugía , Supervivencia Celular/efectos de los fármacos , Técnicas de Cocultivo , Fibroblastos/citología , Fibroblastos/inmunología , Fibroblastos/microbiología , Fusobacterium nucleatum/química , Fusobacterium nucleatum/crecimiento & desarrollo , Fusobacterium nucleatum/patogenicidad , Voluntarios Sanos , Humanos , Interleucina-1beta/farmacología , Interleucina-6/antagonistas & inhibidores , Interleucina-6/biosíntesis , Interleucina-6/inmunología , Interleucina-8/antagonistas & inhibidores , Interleucina-8/biosíntesis , Interleucina-8/inmunología , Lipopolisacáridos/farmacología , Diente Molar/citología , Diente Molar/cirugía , Ligamento Periodontal/citología , Ligamento Periodontal/cirugía , Extractos Vegetales/química , Hojas de la Planta/química , Porphyromonas gingivalis/química , Porphyromonas gingivalis/crecimiento & desarrollo , Porphyromonas gingivalis/patogenicidad , Cultivo Primario de Células , Tannerella forsythia/química , Tannerella forsythia/crecimiento & desarrollo , Tannerella forsythia/patogenicidad , Treponema denticola/química , Treponema denticola/crecimiento & desarrollo , Treponema denticola/patogenicidad
19.
Am J Orthod Dentofacial Orthop ; 154(2): 175-187, 2018 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-30075920

RESUMEN

INTRODUCTION: Our aim was to assess the available evidence for the effects of orthodontic treatment with 4 premolar extractions on the skeletal vertical dimension of the face compared with nonextraction treatment. METHODS: Electronic database searches (MEDLINE, EMBASE, Cochrane Oral Health Group's Trials Register, and CENTRAL) of published and unpublished literature and hand searches of eligible studies were performed, with no language or publication date restrictions. Two authors performed data extraction independently and in duplicate. Risk of bias was assessed. RESULTS: After application of the eligibility criteria, 14 studies were included in this systematic review. All were retrospective. Risk of bias ranged from moderate to critical. Ten studies investigated patients with various skeletal vertical patterns and classes of malocclusion and found no difference between extraction (Ex) and nonextraction (Nonex) treatment in regard to the vertical dimension. Only 2 studies found statistically significant increases in the nonextraction groups, one in N-Me (Ex: +1.5 mm; Nonex: +5.5 mm; P <0.05) and one in SN-GoGn (Ex: -0.9°; Nonex: +0.8°; P <0.05), but without a concurrent significant change in other vertical measurements such as FMA. Two other studies showed opposite findings regarding N-Me (Ex: +2.3 mm; Nonex: +0.9 mm; P <0.05) and FMA (Ex: +0.3°; Nonex: -2.0°; P <0.05). CONCLUSIONS: Although the quality of evidence ranged from moderate to low, there was considerable agreement among these studies, suggesting that orthodontic treatment with 4 premolar extractions has no specific effect on the skeletal vertical dimension. Thus, an extraction treatment protocol aiming to reduce or control the vertical dimension does not seem to be an evidence-based clinical approach.


Asunto(s)
Diente Premolar/cirugía , Cara/anatomía & histología , Ortodoncia Correctiva/métodos , Extracción Seriada , Dimensión Vertical , Humanos
20.
Int Orthod ; 16(3): 470-485, 2018 09.
Artículo en Inglés | MEDLINE | ID: mdl-30006082

RESUMEN

The aim of the present study was to comprehensively assess the posttreatment effect of premolar extraction versus non-extraction on the position and development of the lower third molars. The sample consisted of 227 patient's pre- and posttreatment panoramic radiographs (53 with four premolar extractions, 174 without extractions). The position and developmental stage of the lower third molars were evaluated by using Pell-Gregory's, Winter's, modified Miloro-DaBell's and Demirjian's classifications, respectively. Premolar extraction had a considerably positive influence on the position and development of the lower third molars and therefore could provide better prognosis for their eruption.


Asunto(s)
Diente Premolar/cirugía , Tercer Molar , Extracción Dental , Adolescente , Niño , Femenino , Humanos , Masculino , Tercer Molar/crecimiento & desarrollo , Radiografía Panorámica
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