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1.
Wiad Lek ; 74(5): 1164-1168, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34090284

RESUMO

OBJECTIVE: The aim: Determination of the factors complications occurrence in prosthetics with metal-ceramic prostheses. PATIENTS AND METHODS: Materials andmethods: Clinical, cytological, cytochemical methods and methods of statistical processing of the received data are applied. RESULTS: Results: A number of factors with different degrees of significance have been identified, which in the dynamics of clinical observations of the percentage of absorbed dispersion are decisive in the development of changes in the gums. At the stage of odontopreparation - the 1 factor, with the percentage of absorbed dispersion (12,3%) - preparation. The 2 factor - (11,9%) - traumatic. The 3 factor, periodontal, was slightly less significant (9,8%). In the dynamics of clinical observations for 45 days in the first place was the dissecting factor - (14%). The second most important factor was the vitality of the teeth - (11,5%). The 3 factor remained relatively stable - periodontal (8,5%). In the dynamics of clinical observations after 1 year, a redistribution of significance was noted. The largest percentage of absorbed dispersion covered periodontal factor - (15%). Vitality factor - (11%). Slightly lower, but clinically significant, of (8%) absorbed dispersion, was the preparation factor. CONCLUSION: Conclusions: Statistical analysis of the studied parameters made it possible to determine the key factors for predicting their development and diagnostics, it is important for organizing an increase in the effectiveness of orthopedic prophylactic therapeutic measures at the stages of restoration of dental hard tissues.


Assuntos
Membros Artificiais , Prótese Parcial Fixa , Cerâmica , Planejamento de Dentadura , Implantação de Prótese
2.
Bull Tokyo Dent Coll ; 62(2): 119-125, 2021 Jun 04.
Artigo em Inglês | MEDLINE | ID: mdl-33994423

RESUMO

We report a case of fixed prosthetic treatment for poor esthetics due to the position of the maxillary left lateral incisor in a 43-year-old woman. Initial examination revealed no carious lesions, but the tooth axis of the maxillary right canine showed mesial inclination of approximately 15°. Orthodontic treatment was first proposed but was declined by the patient as they did not wish to undergo a prolonged period of therapy. Therefore, recovery by extraction of the maxillary right lateral incisor and prosthetic treatment was proposed as an alternative. The method to be used for application of a 3-unit fixed partial denture and implant treatment was explained to the patient. She refused to give consent to this plan as well, however, due to concerns regarding the need to cut a lot from a non-problematic tooth and the length of time such treatment would require. Therefore, the problem was finally treated by application of a cantilever single-retainer fixed partial denture while giving sufficient consideration to extraction and occlusal contact. Lithium disilicate was used for the material of the prothesis. At 1 year after completion of treatment, no problem was observed with either the prosthetic appliance or the abutment teeth.


Assuntos
Planejamento de Dentadura , Estética Dentária , Adulto , Porcelana Dentária , Prótese Parcial Fixa , Feminino , Humanos
3.
BMC Oral Health ; 21(1): 171, 2021 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-33794841

RESUMO

BACKGROUND: This study assessed retrospectively the clinical outcomes of single implant-supported crowns and implant-supported fixed dental prostheses (FDPs). METHODS: This case series compared biological and technical complications in single implant-supported crowns and implant-supported bridges in a time framed sample of all patients who received dental implants between 2009 and 2016 in Dubai Health Authority. Only 3-unit implant-supported prostheses (FDPs) with one intervening pontic and an implant each end were included for comparison to single crown supported implants. Cantilevered implants, implant-supported dentures and cases involving bone grafts or sinus lifts were excluded. The primary outcome measure was marginal bone loss, measured on digital radiographs taken after prosthesis placement at baseline and one year after implant loading, whilst peri-implantitis and technical complications were secondary outcomes. Mixed regression models adjusted for clustering of implants within patients was used for patient and implant factor associations. RESULTS: A total of 454 patients (152 males; 302 females) had 1673 implants. The mean age of males (53.7 years, SD 14.6) was significantly greater than females (49.3 years, SD 12.9, p < 0.001). Mean mesial bone loss on the FDPs was significantly greater at 1 year (1.14 mm, SD 0.63) compared with the mesial surface of single implant-supported crowns (0.30 mm, SD 0.43, p < 0.001). Mean distal bone loss was also significantly greater at 1 year on the distal surfaces of implants supporting bridgework (1.29 mm, SD 0.71) compared with distal surfaces on single implant-supported crowns (0.36 mm, SD 0.54, p < 0.001). Mean marginal bone loss mesially and distally around implants placed in the lower anterior sextant was significantly greater compared to all other sites (p < 0.001). Bone loss by gender, patient's age and medical condition was not different between the 2 implant groups. Screw loosening was the main technical complication (11.5%) whilst peri-implantitis occurred rarely (0.5%). The 66 cement retained implants had significantly more complications compared to the 1607 screw retained implants (p < 0.001). CONCLUSIONS: Mean marginal bone loss around the supporting implants of FDPs (3-unit fixed bridgework) was greater than on single implant-supported crowns at one year after implant loading. Position in the mouth was associated with bone loss. Biological and technical complications occurred rarely.


Assuntos
Perda do Osso Alveolar , Implantes Dentários , Perda do Osso Alveolar/diagnóstico por imagem , Perda do Osso Alveolar/etiologia , Coroas , Planejamento de Prótese Dentária , Prótese Dentária Fixada por Implante , Falha de Restauração Dentária , Prótese Parcial Fixa , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
4.
Stomatologiia (Mosk) ; 100(2): 60-63, 2021.
Artigo em Russo | MEDLINE | ID: mdl-33874663

RESUMO

OBJECTIVE: To study the effect of morphological parameters of natural teeth and fixed partial dentures supported by dental implants on the time of occlusion. MATERIAL AND METHODS: The study of the morphological parameters of the first right upper and lower molars of natural teeth and fixed partial dentures supported by dental implants in the positions of the first molars of the upper and lower jaws, followed by determination of the relationship between the obtained data and the occlusion time using mathematical and statistical analysis. RESULTS: The study of the morphology of the occlusal surface of natural teeth and fixed partial dentures supported by dental implants did not reveal significant differences in the results of measuring the distances between the cusps of the upper and lower first molars, both natural teeth and fixed partial dentures supported by dental implants. However, the angles of the slopes of the cusps and the angles between cusps in natural teeth are sharper than those of artificial crowns. CONCLUSION: According to the correlation analysis in both groups, the relationship between the occlusion time and the morphological parameters of the lower molars was determined; the relationship between the morphological parameters of the upper molars and the occlusion time was not revealed.


Assuntos
Implantes Dentários , Boca Edêntula , Oclusão Dentária , Prótese Dentária Fixada por Implante , Prótese Parcial Fixa , Humanos
5.
Int J Oral Maxillofac Implants ; 36(1): 55-58, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33600523

RESUMO

PURPOSE: The purpose of this in vitro study was to evaluate the load-to-fracture values of cement-, screw-, and multiscrew-retained abutments for implant-supported fixed partial dentures (FPDs). MATERIALS AND METHODS: Thirty-six implants with a diameter and length of 4.5 and 13 mm, respectively, were used to prepare 18 samples of FPDs. Based upon the variations on abutment design, the FPDs were divided into three categories as follows: cement-retained, screw-retained, and multiunit screw-retained abutments. Using a chewing simulator, cyclic loads of 1,250,000 load cycles with a load of 70 N were applied on all samples to simulate 5 years of human functional chewing. The samples were loaded until failure using an electromechanical test machine. Sample-size estimation was done, and fracture-load values were recorded as means and corresponding standard deviations; group comparisons were done using one-way analysis of variance and Tukey post hoc tests. A P value < .01 was considered as an indicator of statistical significance. RESULTS: The fracture-load values for cement-, screw-, and multiunit screw-retained abutments were 2,109.2 ± 139.6 N, 3,888.8 ± 70 N, and 3,319.4 ± 218.9 N, respectively. The load-to-fracture values were significantly higher in screw-retained abutments (3,888.8 ± 70 N; P < .001) than in cement-retained (2,109.2 ± 139.6 N) and multiunit screw-retained abutments (3,319.4 ± 218.9 N). CONCLUSION: Screw-retained implant-supported FPDs withstand higher occlusal forces compared with cement- and multiunit screw-based retention techniques. However, the results should be cautiously interpreted, as they were based on a relatively small sample size.


Assuntos
Implantes Dentários , Falha de Restauração Dentária , Parafusos Ósseos , Dente Suporte , Prótese Dentária Fixada por Implante , Análise do Estresse Dentário , Prótese Parcial Fixa , Humanos , Teste de Materiais
6.
Biomed Res Int ; 2021: 6692939, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33628810

RESUMO

The digital workflow and the application of Computer-Aided Manufacturing (CAM) to prosthodontics present the clinician with the possibility of adopting new materials that confer several advantages. Especially in the case of zirconia, these innovations have profoundly changed daily practice. This paper compares the satisfaction and perception of patients who received implant-supported single crowns (SC) and fixed partial dentures (FPD) made from zirconia, either monolithic or partially veneered, after 3 years of follow-up; the success and survival rate of these restorations were also measured. Forty patients, who had been previously treated with implant-supported SC or FPD, either monolithic or partially veneered, and submitted to a yearly maintenance program, were recalled 3 years after their treatment and requested to complete an 8-question questionnaire regarding their perceptions of the treatment. Any mechanical or biological complication that had occurred from the time of delivery was also recorded. Patients that experienced ≥1 complication were less likely to be prone to repeat the treatment. The 3-year success rate was 92.6% for monolithic restoration and 92.3% for partially veneered restoration, while the survival rate was 100% for both restorations. The 3-year follow-up found that monolithic and partially veneered zirconia restorations are both well-accepted treatment options, and patients preferred the veneered restorations (0.76, p < 0.05) from an aesthetic point of view. According to our results, monolithic and veneered zirconia restorations are both reliable treatment options and are both equally accepted by patients.


Assuntos
Coroas , Porcelana Dentária , Planejamento de Prótese Dentária , Prótese Parcial Fixa , Satisfação do Paciente , Inquéritos e Questionários , Zircônio , Estética , Feminino , Humanos , Masculino
7.
Int J Prosthodont ; 34(1): 37-46, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33570518

RESUMO

PURPOSE: To evaluate the 2-year performance of definitive implant- or tooth-supported three-unit fixed dental prostheses made of zirconia-reinforced lithium silicate placed to restore premolars and molars in clinical cases of partial edentulism. MATERIALS AND METHODS: All patients received a three-unit fixed restoration made of monolithic, hot-pressed, zirconia-reinforced lithium silicate glass-ceramic. The restoration was cemented to two natural teeth or attached to two 3.5- or 4.5-mm-diameter square threaded, grit-blasted, acid-etched integrated implants with a Morse taper connection. Peri-implant pocket depth and bone and soft tissue remodeling were recorded for 2 years at each follow-up visit. Esthetic, functional, and biologic United States Public Health Services (USPHS) parameters modified by the World Dental Federation study design were assessed yearly until the final follow-up appointment. At the time of placement of the definitive restorations and at the 2-year follow-up visit, the opposing dentitions were identified by type of restoration and supporting structures. RESULTS: A total of 100 patients were consecutively enrolled in the period between June 2016 and July 2017, and 50 patients each received an implant-supported restoration (Group A) or a tooth-supported restoration (Group B). One (2%) of the 50 implant-supported prostheses fractured after 21 months of function. None of the other prostheses failed or became loose or detached. No significant differences involving probing levels or bone and soft tissue remodeling were found between the follow-up times. No cases of inflammation or infection of the mucosal cuff around the neck of the implants were recorded. The most common issue occurred immediately after placement of the prosthesis, when 3 patients (6%) from Group A and 4 patients (8%) from Group B asked for a modification of tooth shade. CONCLUSION: Implant-supported or tooth-supported three-unit fixed dental prostheses made of zirconia-reinforced lithium silicate can be used to successfully restore cases of posterior partial edentulism. The 2-year results of this report will be studied more in depth in ongoing long-term research.


Assuntos
Implantes Dentários , Lítio , Planejamento de Prótese Dentária , Prótese Dentária Fixada por Implante , Falha de Restauração Dentária , Prótese Parcial Fixa , Seguimentos , Humanos , Silicatos , Zircônio
8.
Artigo em Inglês | MEDLINE | ID: mdl-33572988

RESUMO

Background: Implant dentistry has evolved over time, resulting in better treatment outcomes for both patients and clinicians. The aim of this trial was to test whether the immediate loading of implants with a platform-switching design influences the marginal bone level, compared to four-week loading, after one year of follow-up. Moreover, a comparison of clinical data regarding implant survival, implant stability, and patient-reported outcome measures (PROMs) was conducted. Methods: Klockner® VEGA® implants with a ContacTi® surface were placed in partially edentulous patients in the posterior areas. Group A received an immediately loaded prosthesis (one week) and Group B received an early-loaded prosthesis (four weeks). All abutments were placed at the time of surgery. Radiographic and clinical data were recorded. Results: Twenty-one patients were treated (35 implants). No implants were lost during the study. The final marginal bone level did not show differences between groups. The bone loss at 12 months at the implant level was 0.00 mm for both groups (median). The final implant quotient stability (ISQ) values did not differ between groups (median 73 and 70.25), nor did the other clinical parameters or PROMs. Conclusions: The results suggest that neither of the loading protocols with the implants used influenced the marginal bone level-not the osseointegration rate, clinical conditions, or PROMs.


Assuntos
Perda do Osso Alveolar , Perda do Osso Alveolar/diagnóstico por imagem , Falha de Restauração Dentária , Prótese Parcial Fixa , Seguimentos , Humanos , Osseointegração , Próteses e Implantes , Resultado do Tratamento
9.
Stomatologiia (Mosk) ; 100(1): 52-54, 2021.
Artigo em Russo | MEDLINE | ID: mdl-33528956

RESUMO

THE AIM OF THE STUDY: Was to assess the hemodynamics in the pulp of supporting teeth before and after their preparation for ceramic and metal-ceramic crowns. MATERIALS AND METHODS: The study comprised 40 patients treated with ceramic and metal-ceramic fixed dentures. Pulp hemodynamics was assessed by bipolar reodentography 1, 5, 10 and 20 days after the preparation. RESULTS: At 10 days after dental preparation visual examination of the reodentogram configurations showed their approximation to the original data, which indicates the possibility of using vital teeth as supports for fixed dentures when following the rules of their preparation. CONCLUSION: Supporting teeth vitality in cases of their preparation for ceramic and metal-ceramic crowns may be maintained by the strict adhesion to preparation protocol.


Assuntos
Coroas , Ligas Metalo-Cerâmicas , Cerâmica , Porcelana Dentária , Polpa Dentária , Prótese Parcial Fixa , Dentaduras , Humanos
10.
Niger J Clin Pract ; 24(2): 220-224, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33605912

RESUMO

Objective: The objective was to in-vitro evaluate the mode of failure of abutments supporting fixed partial dentures (FPDs) via different retention techniques. Materials and Methods: Thirty-six implants with diameter and length of 4.5 and 13 mm, respectively, were used to prepare 18 samples of FPDs. Based on the variations on abutment's design, the FPDs were divided into three groups: Group A is cement-based retention; Group B is screw-based retention; and Group C is multiunit screw-based retention. Using a chewing simulator, cyclic loads of 1,250,000 load cycles with the load of 70N were applied on all samples to simulate 5 years of human functional chewing. The samples were loaded until failure using an electromechanical test machine. Sample-size estimation was done and fracture-load values were recorded as means and corresponding standard deviations; and group comparisons were done using one-way analysis of variance and Tukey's post hoc tests. A P value below 0.01 was nominated as an indicator of statistical significance. Results: In total, 36 samples (12 implant-abutment connections per group) were assessed. Abutment bending was observed in 6 (50%), 6 (50%) and 6 (50%) samples in groups A, B and C, respectively. De-attachment of the FPD form the abutment occurred in 5 (41.7%) and 5 (41.7%) samples in groups A and C, respectively. Screw fracture and fracture of FPD at the connector side occurred in 1 (8.3%) and 1 (8.3%) sample in groups A and C, correspondingly. Failure of the FPD was more often encountered in groups A (100%) and C (100%), compared to group B (50%). Conclusion: All abutments underwent failures under cyclic loading with abutment bending being the most common failure mode. Cement- and multi-screw-supported abutments fail more often than screw-supported abutments.


Assuntos
Prótese Parcial Fixa , Dente , Dente Suporte , Prótese Dentária Fixada por Implante , Falha de Restauração Dentária , Análise do Estresse Dentário , Humanos , Mastigação , Teste de Materiais
11.
Quintessence Int ; 0(0): 292-298, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33491389

RESUMO

Objectives: Recent data show that teeth prepared with horizontal finishing lines supporting crowns and fixed partial dentures present more periodontal disorders than untreated control teeth. Several studies have shown that NitrAdine (bonyf) induces a significant reduction of dental biofilm. The aim of this study was to demonstrate that 10-day use of PerioTabs (bonyf), a NitrAdine-based gingiva brushing solution, is effective in treating gingival inflammation of prosthodontic patients. Method and materials: Forty-nine subjects were instructed to brush their teeth, gingivae, and prostheses with the PerioTabs solution for 10 days (treatment group) and 49 with any toothpaste (control group). The initial and 11-day Plaque Index and Bleeding Index were recorded. A five-point Likert scale was used to evaluate the level of patient satisfaction. The Shapiro-Wilk statistical test was used to compare the results for the two groups. Results: Highly significant differences between the treatment and control group (P < .001) for the Plaque Index and Bleeding Index resulted. The treatment group patients' satisfaction was high: 31 (63.3%) reported the highest level, 5, on the Likert scale, and 18 (36.7%) declared they were satisfied (level 4). Conclusions: The use of a NitrAdine-based gingiva brushing solution (PerioTabs) was effective in reducing the gingival inflammation in periodontally affected patients treated with fixed partial dentures. Clinical relevance: The NitrAdine-based gingiva brushing solution (PerioTabs) was highly accepted by the patients and seems to be a promising alternative to the solutions widely used.


Assuntos
Gengiva , Gengivite , Índice de Placa Dentária , Prótese Parcial Fixa , Humanos , Escovação Dentária
12.
Eur J Prosthodont Restor Dent ; 29(2): 112-118, 2021 May 28.
Artigo em Inglês | MEDLINE | ID: mdl-33393740

RESUMO

PURPOSE: If bacteria penetrate through the implant-abutment connection, they may initiate inflammatory reactions in the peri-implant tissue. It seems that the type of connection plays a key role in the development of peri-implantitis. The aim of the present in vitro study was to compare the microleakage of implant-supported fixed complete arch bridges at the levels of abutment and implant. METHODS: Ten identical polyurethane model bases containing six implants each were produced using an edentulous model of the upper jaw. These models were prepared with two types of implant-supported complete arch prostheses. Five specimens were fixed at implant level and five at abutment level. The inner parts implants were inoculated with Escherichia coli (E.coli). Each implant was surrounded with closed bacteria-proof vessels to observe bacterial migration from the inner parts of implants to the nutrient solution. Samples of nutrient solution were taken at different time points up to 2 to 10 days and colony forming units were determined. RESULTS: The bacterial accumulation in the implant-supported bridges at the implant level was significantly lower than at the abutment-level (p=0.00953). CONCLUSION: For implant-supported fixed complete arch prostheses, bacterial accumulation was lower at the implant level than at the abutment-level.


Assuntos
Implantes Dentários , Peri-Implantite , Dente Suporte , Prótese Dentária Fixada por Implante , Prótese Parcial Fixa , Humanos
13.
Dent Mater J ; 40(3): 584-591, 2021 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-33328396

RESUMO

This study aimed to investigate the effect of various framework designs on the failure of posterior fiber reinforced composite (FRC) bridges and assess the post crack performances of the repaired prostheses. Thirty samples were prepared into three different groups of framework designs: cuspal support (CS), anatomic features (AF) and circular reinforcement (CR). All specimens were subjected to static loading test and acoustic emission analysis. Significant differences were found in the load and time of initial failures among the three groups (p<0.001). CS was identified as the optimum framework design. Samples with composite delamination at the pontic site were selected and repaired with a clinically simplified protocol. Significant differences were also observed between the repaired and original FRC bridges (p=0.01). The performance of these prostheses was highly dependent on the framework design and the perspective of repairing FRC bridges may warrant future investigations.


Assuntos
Resinas Compostas , Prótese Parcial Fixa , Materiais Dentários , Análise do Estresse Dentário , Vidro
14.
Evid Based Dent ; 21(4): 138-139, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33339976

RESUMO

Source of funding This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectorsType of study/design Randomised controlled trial (RCT) with parallel design.Subjects This RCT was conducted at the Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Centre of Dental Medicine, University of Zurich, Zurich, Switzerland. Ten patients, six women and four men, with a mean age of 62 years and an age range of 49-77 years, requiring posterior tooth-supported 3-unit fixed partial dentures (FPDs) were included in this RCT. The abutment teeth were six molars and six premolars in the maxilla and five molars and three premolars in the mandible. The patients fulfilled the following inclusion criteria: they all were >18 years, with a full mouth plaque score <25% and a full mouth bleeding score <25%. They all needed a posterior tooth-supported FPD, in which the third molar was not an abutment tooth. Only abutments with no extensive pretreatment were eligible. Adjacent and opposing teeth should be healthy or adequately restored.Treatment Three intraoral digital scanning systems (Lava C.O.S.; 3M [Lava], iTero; Align Technology Inc [iTero], Cerec Bluecam; Dentsply Sirona [Cerec]) and conventional light/regular body polyether impression in a stock tray were made on each of the included participants by the same clinician. The opposing arch impression was made in alginate. The sequence of the four techniques was computer generated and concealed in opaque sealed envelopes. Three calibrated experienced clinicians were involved in the treatment. They followed the published guidelines for preparing abutments that receive CAD/CAM ceramic FPDs. After interim prosthesis removal and double retraction cord application, the digital or the conventional impression procedure was started as dictated by the random sequence. Scans were done according to the manufacturer's guidelines, whereby Lava and Cerec required powdering of the teeth by titanium oxide and iTero did not.Main outcome Time needed for obtaining a scan or an impression was calculated. For digital scans it consisted of the time required for powdering, scanning and occlusal registration, while in conventional impression it started from the beginning of impression mixing till tray removal. The number of impression or scan remakes required until results fulfilling the quality criteria were obtained was also recorded. Visual analogue scale (VAS) was used to rate the perception of both, clinicians and patients for the procedures. Patients were asked to rate their comfort with the procedure, while clinicians rated both difficulty and comfort, where 0 indicated uncomfortable and simple and 100 difficult and comfortable. Subjective assessment of the time as judged by the clinicians and the patients was also reported.Main results Generally speaking, conventional impression was better than the three complete arch digital scans, regarding time required in seconds, difficulty for clinicians, comfort and time perception of both patients and clinicians. Number of remakes were highest in iTero (7), followed by Lava, conventional impression and finally Cerec (0). The time required for each technique differed significantly Polyether = 658 (95%CI 528-782) Cerec = 1776 (95%CI 804-2386) iTero = 1107 (785 - 2091). A significant difference was found neither among the three digital impressions, nor between the conventional impression and Lava (µ = 1091, 95%CI [717-1465]). The same findings were reported regarding difficulty for the clinicians. A significant difference was reported between conventional impression (µ = 15, 95%CI [7-24]) and both Cerec (µ = 67, 95%CI [58-77]) and iTero (µ = 43, 95%CI [25-62]). No significant difference was reported among the studied techniques regarding patients' comfort and time perceptions of both clinicians and patients except for a difference in the patients' time perception of Cerec and conventional impression, where P = .035. Regarding the clinicians' comfort a significant difference was only found between conventional impression (µ = 82, 95%CI [69-94]) and Cerec (µ = 32, 95%CI [18-46]).Conclusion Within the limitations of this RCT, it can be concluded that complete arch conventional impression is objectively less time consuming and subjectively preferred by both clinicians and patients when compared to digital scanning. Digital scanning techniques, requiring powdering, are more difficult for the clinicians than powderless ones and conventional impression.


Assuntos
Materiais para Moldagem Odontológica , Técnica de Moldagem Odontológica , Idoso , Cerâmica , Prótese Parcial Fixa , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Suíça , Fluxo de Trabalho , Zircônio
15.
Rev. Asoc. Odontol. Argent ; 108(3): 129-137, dic. 2020. ilus, tab
Artigo em Espanhol | LILACS | ID: biblio-1147924

RESUMO

Objetivo: Presentar el uso de la cirugía guiada para la resolución quirúrgico-protética de un caso clínico con colocación de implantes de longitud estándar (>7 mm) en un maxilar inferior atrófico, sin regeneración ósea guiada. Caso clínico: Una paciente que requería terapia con implantes en sectores posteroinferiores se presentó en la Cátedra de Odontología Integral Adultos de la Facultad de Odontología de la Universidad de Buenos Aires. Primero se realizó una tomografía computarizada de haz cónico del maxilar inferior para evaluar la disponibilidad ósea. La planificación se efectuó siguiendo un protocolo digital a fin de optimizar la selección de los implantes y su instalación en función de la futura rehabilitación protética y el tejido óseo disponible. Después se escanearon ambos maxilares y el registro intermaxilar; estas imágenes ­junto con las correspondientes a la tomografía (DICOM)­ fueron importadas como archivos (STL) a un software específico de diseño para determinar digitalmente la posición 3D ideal de los implantes y diseñar una guía quirúrgica de precisión. Luego se realizó la cirugía de instalación de los implantes con la guía quirúrgica, y finalmente los implantes fueron rehabilitados por medio de coronas cemento-atornilladas. Conclusión: El uso de la cirugía guiada permitió optimizar el tejido óseo disponible para la instalación de implantes en función de la futura rehabilitación protética (AU)


Aim: To present the use of guided surgery for the prosthetic resolution of a clinical case with placement of implants of standard length (>7 mm) in an atrophic posterior mandible, with no need of bone regeneration. Clinical case: A patient who required implants in the posterior sectors of the mandible attended to the department of Odontología Integral Adultos, Facultad de Odontología, Universidad de Buenos Aires, Argentina. A dental cone beam computed tomography (CBCT scan) of the lower jaw was done to assess bone availability and was decided to perform guided surgery for accurate implant placement. Both maxillaries and intermaxillary occlusal registration were scanned and imported into files (STL) together with those of the CBCT scan (DICOM) into specific design software. Following the digital protocol using a surgical guide the implants were placed and then restored with cemented-screwed crowns. Conclusion: Guided surgery allowed planning implant placement, guided by the final position of the prosthetic restoration, and optimizing the available bone (AU)


Assuntos
Humanos , Feminino , Idoso , Perda do Osso Alveolar/cirurgia , Cirurgia Assistida por Computador , Implantação Dentária Endo-Óssea , Mandíbula , Argentina , Faculdades de Odontologia , Regeneração Óssea , Prótese Parcial Fixa , Tomografia Computadorizada de Feixe Cônico , Reabilitação Bucal
16.
Int J Prosthodont ; 33(5): 503-512, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32956431

RESUMO

PURPOSE: To assess the clinical outcomes of single-retainer resin-bonded fixed dental prostheses (RBFDPs) and the profilometric changes of pontic sites after a mean of 10 years in function. MATERIALS AND METHODS: Ten patients (mean age 32.4 years) who had received an RBFDP replacing a single anterior tooth were recalled after 10 years. Five patients had received a subepithelial connective tissue graft (SCTG) at the pontic site. The clinical assessment comprised the following parameters: probing depth, bleeding on probing, modified plaque control record, gingival recession, measurement of the width of keratinized mucosa, and intraoral photographs and radiographs. The modified criteria of the United States Public Health Services evaluation system were applied. Additionally, patient satisfaction was recorded. Data were analyzed descriptively, and the 10-year RBFDP survival rates were calculated using Kaplan-Meier analysis. RESULTS: The RBFDP survival rate after a mean follow-up of 10.0 years (range 7.4 to 13.3 years) was 100%. Neither technical failures nor biologic complications were observed. All abutment teeth remained vital, and no secondary caries were detected. Between baseline and follow-up examinations, the profilometric changes at the pontic sites were minimal, exhibiting a loss of -0.03 ± 0.10 mm (no SCTG) and 0.00 ± 0.37 mm (SCTG). CONCLUSION: The present study exhibited high survival rates and low complication rates of the restorations, as well as excellent profilometric stability of the pontic sites over 10 years. The use of an RBFDP is a viable long-term treatment option for replacing a single anterior tooth.


Assuntos
Cerâmica , Zircônio , Adulto , Falha de Restauração Dentária , Prótese Parcial Fixa , Humanos , Taxa de Sobrevida
17.
Int J Comput Dent ; 23(3): 293-301, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32789316

RESUMO

AIM: The aim of this case report is to present the minimally invasive replacement of a missing molar in the presence of considerable proximal undercuts of the adjacent abutment teeth. The use of two single-retainer resin-bonded fixed dental prostheses (RBFDPs) made this therapy possible. MATERIALS AND METHODS: A missing mandibular right first molar required replacement. Two single-retainer RBFDPs were digitally designed in the shape of half a molar each and were milled using CAD/CAM from monolithic 3Y-TZP zirconia ceramic. The posterior RBFDP portion retained by the second molar was designed in the pontic contact area to create a common path of insertion for the anterior RBFDP portion with the distal surface of the second premolar. A slight interlocking between the proximal contact surfaces of the two pontics was designed to prevent future migration between the split restorations. Precise placement of the two RBFDPs during adhesive luting was ensured with the aid of a positioning splint. RESULTS: The patient was recalled after 10 months and was very satisfied with the minimally invasive molar replacement. CONCLUSION: Using two single-retainer RBFDPs to replace a molar in a split design enables a minimally invasive posterior tooth replacement despite considerable proximal undercuts of the adjacent abutment teeth.


Assuntos
Colagem Dentária , Prótese Adesiva , Prótese Parcial Fixa , Humanos , Dente Molar , Cimentos de Resina
18.
J Hist Dent ; 68(2): 68-70, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32852268

RESUMO

Historically, many teeth that had been traumatized resulted in extractions and replacements with a fixed partial denture (bridge). However, in rare situations some clinicians provided creative approaches to tooth retention much like what is done today, 125 years later.


Assuntos
Fraturas dos Dentes , Coroas , Prótese Parcial Fixa , História do Século XIX , Humanos , Fraturas dos Dentes/história , Fraturas dos Dentes/terapia
20.
Artigo em Inglês | MEDLINE | ID: mdl-32549291

RESUMO

The aim of this study was to compare the quality of different computer-assisted-design and computer assisted manufacturing systems (CAD-CAM) generated by only one scanner, focusing on vertical fit discrepancies and the mechanical properties. A master model was obtained from a real clinical situation: the replacement of an absent (pontic) tooth, with the construction of a fixed partial denture on natural abutments with three elements. Nine scans were performed by each tested and 36 copies were designed using a dental CAD-CAM software (Exocad). The frameworks were manufactured using three-axis and five-axis, with the same batch of the chrome-cobalt (CrCo) alloy. The frameworks were not cemented. A focus ion beam-high resolution scanning electron microscope (FIB-HRSEM) allowed us to obtain the vertical gap measurements in five points for each specimen. Roughness parameters were measured using white light interferometry (WLI). The samples were mechanically characterized by means of flexural tests. A servo-hydraulic testing machine was used with a cross-head rate of 1 mm/min. One-way ANOVA statistical analysis was performed to determine whether the vertical discrepancies and mechanical properties were significantly different between each group (significance level p < 0.05). The overall mean marginal gap values ranged: from 92.38 ± 19.24 µm to 19.46 ± 10.20 µm, for the samples produced by three-axis and five-axis machines, respectively. Roughness was lower in the five-axis machine than the three-axis one, and as a consequence, the surface quality was better when the five-axis machine was used. These results revealed a statistically significant difference (p < 0.005) in the mean marginal gap between the CAD-CAM systems studied. The flexural strength for these restorations range from 6500 to 7000 N, and does not present any statistical differences' significance between two CAD-CAM systems studied. This contribution suggests that the number of axes improves vertical fit and surface quality due to the lower roughness. These claims show some discrepancies with other studies.


Assuntos
Desenho Assistido por Computador , Planejamento de Dentadura , Prótese Parcial Fixa , Teste de Materiais , Propriedades de Superfície , Zircônio
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