Resin-matrix ceramics for occlusal veneers: Effect of thickness on reliability and stress distribution

Autor(es)

Ruggiero, Mirelle Maria ^[1] ; Gomes, Rafael Soares ^[1] ; Bergamo, Edmara Tatiely Pedroso ^[2] ; Freitas, Mariana Itaborai Moreira ^[1] ; Bonfante, Estevam Augusto ^[2] ; Cury, Altair Antoninha Del Bel ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Prosthodont & Periodontol, Piracicaba Dent Sch, Limeira Ave 901, BR-13414903 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Dept Prosthodont & Periodontol, Bauru Sch Dent, Dr Octavio Pinheiro Brisolla Ave 9-75, BR-17012901 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 37, n. 3, p. E131-E139, MAR 2021.
• Citações Web of Science: 0

Resumo

Objective. To evaluate the influence of resin-matrix ceramic material and thickness on reliability and stress distribution of occlusal veneers (OV). Methods. One hundred and twenty-six OV of a mandibular first molar were milled using a CAD/CAM system and allocated according to materials (resin nanoceramic (RNC) orpolymer-infiltrated ceramic network (PICN)) and thicknesses (0.5, 1.0 and 1.5 mm), totaling six groups (RNC0.5, RNC1, RNC1.5, PICN0.5, PICN1, and PICN1.5). Step-stress accelerated-life testingwas performed (n = 21/group) with the load applied at the distobuccal cusp tip of the occlusal veneer until failure or suspension. The use level probability Weibull curves and reliability were calculated and plotted (90% CI). Finite element analysis evaluated the stress distribution according to maximum principal stress (sigma(max)) on the restoration and maximum shear stress (tau(max)) on the cement layer. Results. There was no difference in the probability of survival for the estimated missions among the groups, except at 600 N in which the results were significantly lower to PICN1.5 (6%) compared to RNC1 (55%) and RNC1.5 (60%). The sigma(max) values were higher for PICN (31.85-48.63 MPa) than RNC (30.78-33.09 MPa) in the same thicknesses. In addition, 0.5 mm groups concentrated more stress in the restoration (33.09-48.63 MPa) than 1.0 mm (31.11-35.36 MPa) and 1.5 mm (30.78-31.85 MPa) groups in the same material. Significance. Both resin-matrix ceramic materials seem up-and-coming restorative systems for occlusal veneers irrespective of the thicknesses as a consequence of the high reliability. (C) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 18/21317-6 - Influência do tipo de material e espessura na confiabilidade e adaptação interna e marginal de onlays produzidas pela tecnologia CAD/CAM
• Beneficiário: Mirelle Maria Ruggiero
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• 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