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1.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 38(1): 101-103, 2020 Feb 01.
Artigo em Chinês | MEDLINE | ID: mdl-32037775

RESUMO

This article reports a case of an orthodontic adolescent patient without a right inferior incisor. The right lower canine was used as the abutment. The single-retainer all-ceramic resin-bonded fixed partial denture was used to restore the complete dentition. Thus, the missing space was filled, and the function and aesthetics were restored.


Assuntos
Prótese Adesiva , Adolescente , Cerâmica , Planejamento de Dentadura , Prótese Parcial Fixa , Estética Dentária , Humanos , Incisivo
2.
Am J Orthod Dentofacial Orthop ; 157(1): 128-131, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31901270

RESUMO

Preservation of the maxillary lateral incisor space after orthodontic treatment in an adolescent patient traditionally requires the use of a retainer with a lateral pontic, commonly referred to as a "flipper," which is minimally effective in the long term. This article illustrates a technique for chairside fabrication of a Maryland bridge retainer for semi-permanent retention. A stainless steel braided palatal wire is bonded to the anterior teeth. A pontic is then built intraorally with flowable composite, using the palatal wire as scaffolding. The retainer is maintained until the patient is of age for a more permanent restoration.


Assuntos
Prótese Adesiva , Adolescente , Humanos , Desenho de Aparelho Ortodôntico , Contenções Ortodônticas , Fios Ortodônticos
3.
Compend Contin Educ Dent ; 40(10): 660-667, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31730365

RESUMO

For the replacement of missing teeth, resin-bonded fixed partial dentures (RBFPDs) are a routine, minimally invasive option clinicians can use on patients who either cannot or will not move forward with surgical interventions. Advances in materials and design have greatly improved the longevity and prognoses for these prostheses. In some patients, however, debonding remains a clinical problem. In this clinical report, novel RBFPD designs are presented with the aim of improving retention and esthetics while offering short treatment time and minimal preparation without the need for local anesthesia.


Assuntos
Colagem Dentária , Prótese Adesiva , Falha de Restauração Dentária , Planejamento de Dentadura , Retenção de Dentadura , Estética Dentária , Humanos
4.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 37(3): 285-289, 2019 Jun 01.
Artigo em Chinês | MEDLINE | ID: mdl-31218863

RESUMO

OBJECTIVE: This study aims to investigate the fracture resistance and short-term restorative effects of resin-bonded fixed partial dentures (RBFPDs) made from heat-pressed lithium-disilicate-based glass-ceramic (IPS e.max press) and zirconia ceramic (WIELAND) and retained by all-ceramic guiding plates when used to restore missing mandibular second premolars. METHODS: A total of 64 human mandibular first premolars and first molars were prepared as abutments, then were randomly divided into 4 groups (n=8): E0, heat-pressed ceramic RBFPDs, no cyclic loading; E1, heat-pressed ceramic RBFPDs exposed to 300 000 cycles of dynamic loading; W0, zirconia ceramic RBFPDs, no cyclic loading; and W1, zirconia ceramic RBFPDs exposed to 300 000 cycles of dynamic loading. Fracture strength was tested in a universal testing machine. RESULTS: The medians of fracture strength were 1 242.85 N±260.11 N (E0), 1 650.85 N±206.77 N (W0), 1 062.60 N±179.98 N (E1), and 1 167.61 N±265.50 N (W1). Statistical analysis showed that all the groups exhibited significantly higher fracture strength compared with the maximum bite force in the premolar region (360 N; P<0.001). The W0 group had significantly higher fracture strength than the E0 group (P<0.05). Meanwhile, no significant difference in fracture strength was observed between the E1 and W1 groups (P>0.05). Significant statistical differences were found between the zirconia ceramic groups (W0 and W1, P<0.05) but not between the glassceramic groups (E0 and E1, P>0.05) after dynamic loading. CONCLUSIONS: The RBFPDs retained by all-ceramic guiding plates exhibited promising fracture properties and optimal short-term restorative effects when used to restore missing mandibular second premolars.


Assuntos
Falha de Restauração Dentária , Prótese Adesiva , Dente Pré-Molar , Cerâmica , Porcelana Dentária , Análise do Estresse Dentário , Planejamento de Dentadura , Prótese Parcial Fixa , Humanos , Teste de Materiais , Zircônio
5.
J Dent ; 86: 118-125, 2019 07.
Artigo em Inglês | MEDLINE | ID: mdl-31181243

RESUMO

OBJECTIVES: Two-unit cantilevered resin-bonded fixed partial dentures (RBFPDs) offer long-term retention for anterior and premolar-sized spans. At this center, molar and longer spans have been restored with fixed-movable (FM) RBFPDs to overcome the lower retention rates of fixed-fixed RBFPDs. This retrospective study aimed to evaluate the long-term longevity and the patient-reported outcomes of posterior FM-RBFPDs. METHODS: Posterior FM-RBFPDs that had been inserted at least five years were reviewed. Survival was "retention of the original prosthesis in mouth" and success was "survival of prosthesis and absence of complications requiring treatment intervention". Prosthesis location, number of units, insertion year, tooth/teeth replaced and operator experience were collected. Patients' acceptance to FM-RBFPDs were assessed using prosthesis satisfaction questionnaire and Oral Health Impact Profile (OHIP-49). Results were analyzed using log-rank and cox-regression tests at significance level α = 0.05. RESULTS: One-hundred-and-one prostheses were examined. The mean observation time was 126.4 ±â€¯32.2 months. Thirty-six (35.6%) and 63 (62.4%) FM-RBFPDs were rated as success and survival respectively. Prostheses inserted after year 2001 (n = 69) experienced 42.0% (n = 29) success and 75.4% (n = 52) survival, and its survival rate was significantly better than those inserted in or before 2001 (p = 0.01). Five- and ten-year cumulative survival probability of FM-RBFPDs inserted after year 2001 were 82.3% and 74.1% respectively. The most frequent complications were debonding among 34 (33.7%) prostheses. Patients' acceptance were high. CONCLUSIONS: More recently inserted prostheses showed improved longevity and patients' acceptance to posterior FM-RBFPDs were high. CLINICAL SIGNIFICANCE: Fix-Movable RBFPDs are a viable tooth replacement option in the posterior region.


Assuntos
Prótese Adesiva , Falha de Restauração Dentária , Planejamento de Dentadura , Retenção de Dentadura , Prótese Parcial Fixa , Humanos , Estudos Retrospectivos
6.
Comput Methods Biomech Biomed Engin ; 22(10): 953-960, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31045456

RESUMO

The mechanical properties of the adhesive cement used in resin-bonded fixed partial dentures (RBFPD) can modify the clinical performance of the rehabilitation. The goal of this study was to evaluate the influence of the elastic modulus of different cements on the stress distribution in RBFPD using finite element analysis. For that an anterior 3-unit prosthesis was modeled based in a stereolithography file. The model was meshed with tetrahedral elements and materials considered isotropic, linearly elastic and homogeneous. The force applied to the palatal area of the lateral incisor (pontic) at 45° was 100 N. The cements used presented 7 different elastic modulus (E): 2, 6, 10, 14, 18, 22 or 26 GPa. The total deformation, von-Mises stress and maximum principal stress criteria were used to calculate the results. The lower tensile stress occurred in the cement layer with E = 2 GPa [25.6 (canine) and 16.32 MPa (incisor)]. For the prosthesis, the model with the lower tensile stress [287 (canine) and 248 MPa (incisor)] occurred when the cement presented E = 26 GPa. In this way, the stress concentration may have its magnitude modified depending on the stiffness of the cement. Since more flexible cements concentrate less tensile stress in its structure, but allow an increased displacement of the prosthesis, which is friable and rigid and ends up concentrating more tensile stress at its connector. In that way the clinician should avoid the use of adhesive cement with lower elastic modulus due to it increases the stress concentration in the ceramic.


Assuntos
Cimentos Dentários/farmacologia , Análise do Estresse Dentário , Prótese Adesiva , Cimentos de Resina/farmacologia , Módulo de Elasticidade , Análise de Elementos Finitos , Humanos , Incisivo , Estresse Mecânico
7.
J Prosthodont Res ; 63(3): 374-382, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30878520

RESUMO

PURPOSE: We clarified cumulative survival and event-free rates of resin-bonded fixed dental prostheses (RBFDPs) and compared them to those of fixed dental prostheses (FDPs) to refine risk factors for non-survival/event and use of tooth extraction after the period of non-survival/event. METHODS: Study subjects were selected among all patients who consecutively attended the Fixed Prosthodontic Clinic of Okayama University Hospital. Eligible patients were those who received 3-unit metal-framed 2-retainer (wing-wing) RBFDPs or conventional full-coverage FDPs (RBFDPs/FDPs: 129/177 prostheses). Data were analyzed by Kaplan-Meier analysis with the log-rank test, Mann-Whitney test, chi-square test, and Cox proportional hazards analysis. RESULTS: The 15-year cumulative survival rates were 66.5% for the RBFDP group and 61.6% for the FDP group, which were not significantly different (p = 0.59). The 15-year cumulative event-free rates were 53.4% for the RBFDP group and 59.2% for the FDP group, which were not significantly different (p = 0.52). No significant risk factors related to non-survival and event-free of RBFDPs/FDPs were identified in the analysis model using treatment method, sex, age, number of remaining teeth, and treatment site as explanatory variables. The number of cases in which RBFDPs/FDPs resulted in non-survival due to abutment tooth extraction was significantly lower in RBFDPs (p < 0.01). Further, the abutment tooth as a non-vital tooth was identified as a risk factor for RBFDPs/FDPs resulting in non-survival due to abutment tooth extraction. CONCLUSIONS: The present study is the first to indicate RBFDP as a prosthetic treatment option which should be selected for patients with slight or no abutment tooth decay.


Assuntos
Colagem Dentária , Prótese Dentária , Prótese Adesiva , Falha de Restauração Dentária , Prótese Parcial Fixa , Humanos
8.
J Esthet Restor Dent ; 31(1): 40-50, 2019 01.
Artigo em Inglês | MEDLINE | ID: mdl-30302909

RESUMO

OBJECTIVES: To assess and compare the 5-year success rate of resin-bonded fixed partial dentures (RBFPDs) fabricated from different materials. METHODS: An electronic search on 3 databases from January 1965 to March of 2017 was done for human randomized clinical trials (RCTs), and prospective and retrospective cohort studies. The key words used in the search were: Bridge OR bridges OR fixed partial OR fixed dental AND resin bonded OR Maryland OR ceramic bonded. Quality assessment was done using the Newcastle-Ottawa scale. Success was defined as the RBFPDs remaining in situ and not having experienced debonding, biological failures, or mechanical failures at the examination visit. RESULTS: Meta analyses of the included studies showed an estimated 5-year success rate of 88.18% for the metal framework RBFPDs and 84.41% for the nonmetal framework RBFPDs. The estimated 5-year success rate for each nonmetal material category was 92.07% for zirconia, 94.26% for In-Ceram alumina, and 84.83% for fiber-reinforced composite. The failure rate was not statistically significant among the single, double, and multiple retainers RBFPDs (P > .05). Technical complications were the main reason for failures. CONCLUSION: The 5-year clinical performance of RBFPDs is similar to the performance of conventional fixed partial dentures (FPDs) and implant-supported crowns. CLINICAL SIGNIFICANCE: Clinicians should consider using RBFPDs more often because their clinical performance is similar to the performance of conventional FPDs and implant-supported crowns.


Assuntos
Planejamento de Dentadura , Prótese Adesiva , Resinas Sintéticas , Falha de Restauração Dentária , Prótese Parcial Fixa , Humanos , Estudos Prospectivos , Ensaios Clínicos Controlados Aleatórios como Assunto , Estudos Retrospectivos
9.
J Hist Dent ; 67(2): 110, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-32189627

RESUMO

The dental world was introduced to a revolutionary and esthetically pleasing adhesive-retained fixed partial denture for the replacement of anterior missing teeth in the early 1980s.1, 2 Patient comfort was enhanced along with minimal pulpal trauma to adjacent teeth that may occur with the extensive cutting of tooth structure with the use of full coverage crowns. Proffered by faculty from the University of Maryland, this tooth replacement was ultimate known as the Maryland Bridge, and it has been used extensively to the benefit of many patients. However, as with anything in history, especially the history of dentistry, the evolution of these types of improvements often comes from information buried in the vaults of the numerous dental publications that arose in the 1700-1800s, vaults that are only too often never opened to the riches within. So it was also with this prosthetic replacement as significant evidence exists in 1887 that this prostheses was used routinely by restorative dentists.3 Dr. Allison R. Lawshee from Trenton, NJ, USA provided the dental world with this replacement prosthesis almost 100 years prior to the what we know today at the Maryland Bridge. While not possessing the properties of contemporary etching and adhesion, minimal tooth damage was highlighted and sound principles of cementation were advocated Figs. 1, 2 and 3. Historical evidence and enlightenment for today's generation at its finest.


Assuntos
Prótese Adesiva , Cimentação , Coroas , Retenção de Dentadura , Prótese Parcial Fixa , Prótese Adesiva/história , História do Século XIX , História do Século XX , História do Século XXI , Humanos
10.
Niger J Clin Pract ; 21(12): 1585-1589, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30560821

RESUMO

Purpose: The aim of this study was to compare in vitro fracture strengths (FSs) of metal- and fiber-reinforced frameworks of resin-bonded bridges and to evaluate stress distribution with finite element analysis (FEA). Materials and Methods: Totally 80 extracted maxillary central and maxillary canine teeth were used for in vitro part of this study as two groups; metal-reinforced framework (n = 20) [(metal-supported resin-bonded bridge (MR-RB)] and fiber-reinforced frameworks (n = 20) [fiber-reinforced resin-bonded bridge (FR-RB) were prepared for three unit resin-bonded bridges. All bridges were loaded from lateral pontic at 1 mm/min crosshead speed and fracture values were recorded. Mann-Whitney U-test was used for statistical analysis, and fracture patterns were evaluated visually. FEA was carried out in the second part of the study, and stress distribution of MR-RB and FR-RB structures was analyzed using one of the models from in vitro specimens as main model. Results: The mean FSs of MR-RB and FR-RB were 637.47 ± 151.91 N and 224.86 ± 80.97 N, respectively. Fiber-reinforced specimens were found to distribute stress more homogeneous and connectors in each framework were the regions where stress concentrated mostly. Conclusion: In vitro FSs of MR-RB and the stress concentration of the point that the forces were applied were higher as compared to other parts of the restoration. Furthermore, in contrast to FR-RB specimens, retainer tooth fractures were observed in MR-RB specimens.


Assuntos
Resinas Compostas/química , Análise do Estresse Dentário/métodos , Prótese Adesiva , Cimentos de Resina/química , Fraturas dos Dentes , Materiais Dentários , Análise de Elementos Finitos , Humanos , Teste de Materiais
11.
Eur J Prosthodont Restor Dent ; 26(4): 203-211, 2018 Nov 29.
Artigo em Inglês | MEDLINE | ID: mdl-30398816

RESUMO

OBJECTIVE: To evaluate the clinical longevity of 58 adhesively bonded single unit yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic Resin Bonded Bridges (RBB). MATERIALS AND METHODS: Twenty six consecutive patients with at least one congenitally missing tooth in the maxilla or mandible were provided with 58 single unit Y-TZP RBBs. The cantilever RBBs were designed and milled using a CAD-CAM system to produce frameworks which were veneered using a glass-ceramic material and cemented with a self-etching dual-cure resin cement. RESULTS: Following a mean follow up period of 36.2 months (maximum 62.3 months, minimum 25.4 months), 48 restorations remain in service with a survival rate of 82.7%. One anterior retainer fracture was encountered and no fractures of the posterior framework or ceramic were noted within the time frame reported. CONCLUSIONS: All ceramic Y-TZP RBBs replacing maxillary and mandibular teeth in the anterior and posterior areas demonstrated an 82.7% Kaplan Meier survival rate over 3 years, which was comparable to previously published survival rates for the non-perforated metal framework RBBs. CLINICAL IMPLICATIONS: Replacement of anterior or posterior teeth using single unit cantilevered RBBs using Y-TZP ceramics should be considered a viable restorative option with a high survival rate.


Assuntos
Cerâmica , Prótese Adesiva , Zircônio , Desenho Assistido por Computador , Humanos , Cimentos de Resina
12.
Quintessence Int ; 49(10): 789-798, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30349904

RESUMO

This article describes single-retainer resin-bonded fixed dental prostheses (RBFDPs) as an excellent alternative to orthodontic space closure or tooth replacement with implants or conventional fixed dental prostheses for congenitally and traumatically missing anterior teeth. Although the treatment with RBFDPs is technique sensitive, it is extremely reliable given a correct indication and adequate adhesive procedures.


Assuntos
Anodontia/reabilitação , Prótese Adesiva , Incisivo , Perda de Dente/reabilitação , Adolescente , Criança , Implantes Dentários para Um Único Dente , Planejamento de Prótese Dentária , Feminino , Humanos , Masculino , Fechamento de Espaço Ortodôntico
13.
J Esthet Restor Dent ; 30(6): 469-473, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30267598

RESUMO

OBJECTIVE: The beneficial mechanical properties of zirconia, together with the adhesive techniques, provide a wide range of clinical applications, including the construction of thin structures and minimally invasive adhesive restorations. CLINICAL CONSIDERATIONS: A periodontal disease-related missing maxillary central incisor, in a pregnant patient with chronic periodontal disease in the first trimester of pregnancy, and with type II diabetes treated with resin-bonded fixed partial denture using the missing tooth cemented to a zirconia framework and then bonded to the abutment teeth. CONCLUSIONS: According to the systemic conditions presented in this case report, using a low-cost technology and the missing tooth it was possible to obtain an easier and satisfactory esthetic and functional result. CLINICAL SIGNIFICANCE: The mechanical properties of zirconia made it possible to treat a pregnant patient with chronic periodontal disease in the first trimester of pregnancy, and with type II diabetes with a thin zirconia framework and minimally invasive adhesive restorations.


Assuntos
Prótese Adesiva , Diabetes Mellitus Tipo 2 , Cimentos Dentários , Prótese Parcial Fixa , Humanos , Incisivo
14.
J Esthet Restor Dent ; 30(4): 307-318, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-30113136

RESUMO

OBJECTIVES: The aim of this study is to systematically review all the clinical articles about all-ceramic resin-bonded fixed dental prosthesis (RBFDP) in the anterior region and assess their designs, clinical procedures, and survival rates. A systematic review was conducted after searching electronic databases PubMed/Medline and EBSCOhost Research Databases for articles published in English between 1987 and July 2017. MATERIALS AND METHODS: The inclusion criteria were selected as all clinical studies, original design clinical reports, and clinical reports (follow-up time more than 1 year) as all clinical information in the literature are desired to be included in the present review. RESULTS: The initial electronic search generated 472 articles from PubMed/Medline and 464 articles from EBSCOhost Research Databases. After selection of the articles as per the inclusion criteria, a final sample of 29 original studies is decided as: 1 randomized controlled clinical trial, 4 clinical controlled trials, 4 prospective cohort studies, 2 retrospective cohort studies, 6 original design clinical reports, and 12 clinical reports. After evaluation of the selected articles, it is likely that cantilever design all-ceramic RBFDPs are more successful than two retainer design in the anterior region; however, there is limited evidence for this result in the literature. CONCLUSION: Well-designed randomized controlled clinical trials with large sample size are still needed to achieve more accurate results about the clinical success rate of different RBFDPs designs in the anterior region. CLINICAL SIGNIFICANCE: Indications, designs, abutment teeth preparation, provisionalization, try-in, surface treatment options, and cementation of the all-ceramic resin-bonded fixed dental prostheses are described in this article. Clinical survival rates are also given in detail, so that clinicians can easily compare the current studies and give their own decision about all-ceramic resin-bonded fixed dental prostheses in the anterior region.


Assuntos
Falha de Restauração Dentária , Prótese Adesiva , Cerâmica , Estudos Prospectivos , Ensaios Clínicos Controlados Aleatórios como Assunto , Estudos Retrospectivos , Taxa de Sobrevida
16.
J Oral Maxillofac Surg ; 76(5): 956-962, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29294352

RESUMO

PURPOSE: The aim of this study was to evaluate the midterm outcomes of fixed, full-arch, fiber-reinforced resin bridges on ultrashort implants in terms of marginal bone loss and overall implant survival. PATIENTS AND METHODS: Patients with severely atrophic mandibles, corresponding to Cawood and Howell class V and class VI, were included in this prospective temporal cohort study. Mesial and distal peri-implant bone levels were measured on panoramic radiographs taken at the time of implant insertion (baseline) and at follow-up visits. RESULTS: A total of 17 patients with atrophic mandibular jaws with an average follow-up period of 2.9 ± 1.5 years were included. The cumulative 1-, 3-, and 5-year patient-based implant survival rates were 94.1%, and the cumulative implant survival rates were 98.5%. The marginal bone level (MBL) of the mesial implants was 0.0 ± 0.3 mm at the time of loading (n = 33), -0.1 ± 0.3 mm (n = 20) after 1 year, -0.4 ± 0.5 mm (n = 10) after 3 years, and -1.5 ± 1.0 mm (n = 4) after 5 years. The mesial bone level depended significantly on time and insertion depth. The MBL of the distal implants was -0.4 ± 0.4 mm (n = 34) at the time of implantation, -0.4 ± 0.6 mm (n = 20) after 1 year, -0.5 ± 0.5 mm (n = 10) after 3 years, and -2.2 ± 1.7 mm (n = 4) after 5 years. The distal bone level depended significantly on time and insertion depth. CONCLUSIONS: Fixed, full-arch, fiber-reinforced resin bridges retained by 4 ultrashort implants provide a comparatively cost-effective, safe, stable alternative for prosthetic restoration of the severely atrophic mandible. The overall implant survival rate and the MBL after 5 years are equivalent to those of threaded implants of conventional lengths.


Assuntos
Perda do Osso Alveolar/cirurgia , Implantação Dentária Endo-Óssea/instrumentação , Implantes Dentários , Prótese Dentária Fixada por Implante , Prótese Adesiva , Doenças Mandibulares/cirurgia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Implantação Dentária Endo-Óssea/métodos , Planejamento de Prótese Dentária , Falha de Restauração Dentária/estatística & dados numéricos , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Resultado do Tratamento , Adulto Jovem
17.
Kathmandu Univ Med J (KUMJ) ; 16(61): 97-99, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30631027

RESUMO

Most often the anterior teeth and those that are visible when a patient speaks or smiles are chosen for esthetic restorations. The mandibular anterior fixed bridge often presents problems to the dentist due to the size of the natural teeth and their visibility. In addition, due to high cost factor, many patients are not able to afford fixed partial denture for missing anterior teeth. This article describes a cost effective technique for the restoration of missing mandibular anterior teeth by fabrication of full coverage crowns and resin-bonded fixed bridge combination.


Assuntos
Coroas , Prótese Adesiva , Anodontia/terapia , Coroas/economia , Restauração Dentária Permanente , Prótese Parcial Fixa/economia , Prótese Adesiva/economia , Humanos , Dente
18.
Oper Dent ; 43(1): E32-E36, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29284099

RESUMO

The use of the direct fiber-reinforced fixed dental prosthesis (FDP) restorative technique presented in this article will result in an ideal restoration considering both esthetics and function in a single appointment. Although indirect techniques are available and may be used, they are time-consuming, resulting in higher cost; therefore, a simplified approach combining a prebonded fiber-reinforced mesh with a sculptable micro-hybrid composite will deliver an acceptable esthetic result with proper function.


Assuntos
Restauração Dentária Permanente/métodos , Prótese Adesiva , Incisivo/cirurgia , Resinas Compostas/uso terapêutico , Planejamento de Dentadura/métodos , Humanos , Pessoa de Meia-Idade
19.
J Prosthet Dent ; 119(1): 89-96, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28533015

RESUMO

STATEMENT OF PROBLEM: The clinical use of ceramic resin-bonded fixed dental prostheses (RBFDPs) in the posterior region is desirable for esthetic and biological reasons but has been associated with many technical problems, including fractures or chipping of the veneer. Although these problems may be overcome by using monolithic zirconia, information is lacking about the load-bearing capacity of resin-bonded monolithic zirconia restorations for replacing a molar. PURPOSE: The purpose of this in vitro study was to compare the load-bearing capacity (Fu), the load at initial damage (F1d), and the failure pattern of posterior RBFDPs fabricated from monolithic zirconia (MZr), veneered zirconia (VZr), and veneered cobalt-chromium (VCo). MATERIAL AND METHODS: For the replacement of a maxillary first molar, 4 groups (n=8) of RBFDPs differing in prosthesis material and retainer design (MZr-IR-RBFDPs, VZr-IR-RBFDPs, MZr-WR-RBFDPs, and VCo-WR-RBFDPs; IR, inlay-retained; WR, adhesive wing-retained) were fabricated with anatomic congruence of the FDP-abutment complex. The RBFDPs were subjected to thermocycling (10000×6.5°C/60°C) and mastication simulation (30-degree oblique loading on the pontic; 1200000×108 N) and then loaded until failure in a universal testing machine (0.5 mm/minute). Test forces correlating with Fu and F1d were recorded. Statistical analysis was performed by using 2-way analysis of variance (ANOVA), 2-way repeated measures ANOVA, and the Tukey honest significant differences post hoc test (2-sided α=.05). RESULTS: Fu was significantly affected by retainer design (P<.001) and F1d by both retainer design (P<.001) and prosthesis material (P<.001). Fu was more than 2000 N for WR-RBFDPs and more than 1000 N for IR-RBFDPs (Tukey test ranking: MZr-WR-RBFDPs = VCo-WR-RBFDPs > MZr-IR-RBFDPs = VZr-IR-RBFDPs). Ceramic RBFDPs failed by complete fracture in the connector region, whereas failure of VCo-WR-RBFDPs was limited to the ceramic veneer. F1d was significantly lower (P≤.004) than Fu for veneered specimens only; F1d started at test forces below 500 N and coincided with veneer cracking. CONCLUSIONS: Load-bearing capacity suitable for the definitive restoration of a molar was observed for all groups. Veneered resin-bonded fixed dental prostheses, however, were susceptible to cracking of the veneer.


Assuntos
Colagem Dentária , Planejamento de Prótese Dentária , Prótese Adesiva , Ligas Metalo-Cerâmicas , Suporte de Carga , Zircônio , Técnicas In Vitro , Teste de Materiais
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