Minimal tooth preparation for posterior monolithic ceramic crowns: Effect on the mechanical behavior, reliability and translucency

Autor(es)

Piva, Amanda Maria de Oliveira Dal ^[1] ; Tribst, Joao Paulo Mendes ^[1] ; Jalkh, Ernesto Byron Benalcazar ^[2] ; Anami, Lilian Costa ^[1] ; Bonfante, Estevam Augusto ^[2] ; Bottino, Marco Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ Unesp, Inst Sci & Technol, PhD Grad Program Restorat Dent, Ave Engn Francisco Jose Longo 777, BR-12245000 Sao Jose Dos Campos, SP - Brazil

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

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 37, n. 3, p. E140-E150, MAR 2021.
• Citações Web of Science: 1

Resumo

Objective. Despite the increased use of monolithic crowns, their performance has yet to be determined when the minimal tooth preparation (MTP) principle is considered. The goal of this study was to evaluate the effect of MTP on the mechanical behavior, reliability and translucency of posterior monolithic ceramic crowns. Methods. Dentin analogues were machined using two preparation designs (0.5 or 1 mm reduction) to receive first molar crowns in order to evaluate the monolithic crown performance. Next, 126 crowns were divided (21/g) according to the material (High translucent zirconia - YZHT, Zirconia reinforced lithium silicate - ZLS and Hybrid ceramic - HC) and thickness (0.5 or 1 mm). Tensile stress concentration was calculated using the finite element method. The crowns were adhesivelly cemented and step stress fatigued to calculate reliability for missions at 600 and 1000 N. Translucency was analyzed in 10 discs of each material and thickness. Results. Higher stress concentration was found in thinner crowns and those with higher elastic modulus. YZHT crowns were suspended when fatigue reached 1500 N load, thus 1-parameter Weibull was used to analyze the data. Reliability was only affected by thickness at 1000 N. ZLS.5 showed lower survival than HC.5, which was similar to the groups that presented 100% survival. YZHT showed the highest strength and data scattering. ZLS1 (22.3 +/- 1.4) presented higher translucency than HC1 (19.2 +/- 0.6) and YZHT1 (12.0 +/- 2.9), whereas ZLS.5 and HC.5 were similar to each other (26.5 +/- 2.3, 26.7 +/- 2.2) and superior to YZHT.5 (12.7 +/- 1.2). Significance. HC.5 combined high reliability and translucency with low stress concentration, yielding better crown performance and tooth preservation. (C) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (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: 17/23059-1 - Comportamento de diferentes reabilitações com materiais cerâmicos sob fadiga mecânica
• Beneficiário: Marco Antonio Bottino
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/03984-5 - O efeito do desgaste na maquiagem de diferentes cerâmicas monolíticas
• Beneficiário: Amanda Maria de Oliveira Dal Piva
• 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
• Processo FAPESP: 17/09104-4 - Comportamento biomecânico e sobrevivência de coroas de cerâmica híbrida implanto-suportadas confeccionadas por diferentes técnicas
• Beneficiário: João Paulo Mendes Tribst
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/11535-3 - Influência da espessura da cerâmica no comportamento biomecânico, sobrevivência e translucidez de coroas monolíticas
• Beneficiário: Amanda Maria de Oliveira Dal Piva
• Modalidade de apoio: Bolsas no Brasil - Doutorado