| Texto completo | |
| Autor(es): |
Benalcazar Jalkh, Ernesto B.
;
Neto, Juvenal de Souza
;
Bergamo, Edmara T. P.
;
Maia, Camila F.
;
Bonfante, Estevam A.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Esthetic and Restorative Dentistry; v. 33, n. 4, p. 8-pg., 2021-01-10. |
| Resumo | |
Objective: To investigate the probability of survival and failure modes of four-unit implant-supported porcelain fused to metal (PFM) dentogingival prostheses subjected to step-stress accelerated life testing (SSALT). Materials and methods: Eighteen implant-supported PFM dentogingival prostheses with thin metallic infrastructures, which provided minimal ceramic support and improved esthetics were fabricated over external hexagonal connection UCLA abutments. SSALT was performed until specimen failure. Use level probability Weibull curve and reliability were calculated and plotted. Weibull modulus (m) and characteristic strength (eta) were also calculated. Polarized light microscope and scanning electron microscope were used to characterize fractures. Results: Failures were dictated by material strength rather than fatigue damage accumulation. The probability of survival for loads reaching 100 and 150 N in 100,000 cycles was 92 and 61%, respectively. No cracks or fractures were identified in the veneered porcelain, whereas abutment fixation screw fracture was the chief failure mode. Conclusion: Implant-supported PFM four-unit dentogingival prostheses with minimum metal framework dimensions presented favorable lifetime prediction under fatigue testing. Fractures were restricted to fixation screws. Clinical significance: In-vitro fatigue testing and failure mode analyses evidenced favorable lifetime prediction for 4-unit implant-supported dentogingival prostheses with minimum metal frameworks. Abutment fixation screw fracture might be the most frequent clinical complication. Since this proof of concept has been tested in-vitro, further studies including different restorative materials, as well as long-term clinical trials are warranted. (AU) | |
| Processo FAPESP: | 12/19078-7 - Desenvolvimento e processamento de compósito de Al2O3-ZrO2 para próteses monolíticas CAD/CAM: efeito do envelhecimento na resistência à flexão biaxial |
| Beneficiário: | Estevam Augusto Bonfante |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 16/18818-8 - EMU concedido no processo 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package |
| Beneficiário: | Estevam Augusto Bonfante |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |
| Processo FAPESP: | 19/08693-1 - Compósitos experimentais à base de alumina e zircônia infiltrados por vidro: caracterização microestrutural e das propriedades ópticas e mecânicas. |
| Beneficiário: | Edmara Tatiely Pedroso Bergamo |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 19/00452-5 - COMPÓSITOS EXPERIMENTAIS 70%Al2O3-30%ZrO2: CARACTERIZAÇÃO MECÂNICA, ESTRUTURAL E TOPOGRÁFICA |
| Beneficiário: | Ernesto Byron Benalcazar Jalkh |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 18/03072-6 - Compósitos experimentais 70%Al2O3-30%ZrO2: caracterização estrutural e da sobrevida antes e após envelhecimento |
| Beneficiário: | Ernesto Byron Benalcazar Jalkh |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |