Monolithic CAD/CAM laminate veneers: Reliability and failure modes

Autor(es)

Romanini-Junior, Jose Carlos ^{[1, 2]} ; Hirata, Ronaldo ^[1] ; Bonfante, Estevam A. ^[3] ; Bordin, Dimorvan ^[2] ; Kumagai, Rose Yakushijin ^[2] ; Fardin, Vinicius P. ^[3] ; Coelho, Paulo G. ^{[1, 4, 5]} ; Reis, Andre F. ^[6]

Afiliação do(s) autor(es)

^[1] NYU, Dept Biomat & Biomimet, New York, NY - USA

^[2] Universus Veritas UNG, Dept Restorat Dent, Guarulhos, SP - Brazil

^[3] Univ Sao Paulo Bauru, Dept Prosthodont & Periodontol, Sch Dent, Alameda Otavio Pinheiro Brisola 9-75, BR-17012901 Bauru, SP - Brazil

^[4] NYU, Mech & Aerosp Engn, Tandon Sch Engn, New York, NY - USA

^[5] NYU Langone Hlth Sch Med, Hansjorg Wyss Dept Plast Surg, New York, NY - USA

^[6] Univ Florida, Dept Restorat Dent Sci, Div Operat Dent, Gainesville, FL - USA

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 36, n. 6, p. 724-732, JUN 2020.
• Citações Web of Science: 0

Resumo

Objectives. to evaluate the probability of survival and failure modes of lithium-disilicate, feldspathic-ceramic, and resin-nanoceramic anterior veneers cemented on dentin analog substrates after sliding-contact step-stress accelerated life testing (SSALT). Methods. A virtual incisor tooth preparation was produced with a reduction of 1.5 mm at the incisal edge and of 0.7 mm buccally. A .STL file of the preparation was generated and CAD/CAM based G10 dentin-analog material was used for testing. Laminate veneers were milled in three different materials: lithium-disilicate (LDS, E.max CAD), resin-nanoceramic (RN, Lava Ultimate), and feldspathic-ceramic (FELDS, Vita Blocks). SSALT was employed where a spherical indenter contacted the veneer, slided along its interface with G10 to lift off and start a new cycle at 2 Hz in water. Qualitative fractography was performed. The probability of survival (90% confidence-bounds) was calculated for several load/cycle missions. Results. The probability of survival for a mission of 50,000 cycles decreased from 50 up to 150 N equally for all groups and were not different between them. At 200 N, the probability of survival was significantly lower for FELDS (10%) compared to RN veneers (41%), whereas LDS presented intermediate values (22%). The characteristic strength of RN (247 N) was significantly higher than LDS (149 N), and FELDS (151 N). In FELDS and LDS, hackles, wake hackles and twist hackles indicated the direction of crack propagation. In RN, hackles were observed. Conclusions. Differences in probability of survival were observed only at 180 and 200 N between groups. Failure modes were similar with veneer fracture down to the tooth-analog substrate. (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
• Linha de fomento: Auxílio à Pesquisa - Apoio a 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
• Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários