Bond strength between dentin and CAD/CAM fiber-reinforced composite blocks after mechanical fatigue and thermocycling

• Grant number: 14/18463-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2015
• End date: December 31, 2015
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Estevam Augusto Bonfante
• Grantee: Lucas Fracassi de Oliveira Lino
• Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

The objective of this study is to evaluate the bond strength of CAD/CAM fiber- reinforced composite (FRC) blocks bonded to the dentin of freshly extracted human third molars (n = 45, 15 per group, up to 06 months after extraction), subjected or not to mechanical fatigue and / or thermal cycling by means of microtensile testing (ISO/TS 11405:2003). Bond strength between fiber-reinforced composite and dentin will be evaluated in 3 different scenarios, as follows: 1) Immediate (24 hours after cementation); 2) Immediate + cyclic fatigue; 3) Immediate + thermocycling. FRC blocks will be sandblasted with Al2O3, treated with CRB adhesive system (Shofu) and bonded to hybridized dentin (All Bond 3, Bisco) with C&B resin cement (Bisco). The bonded blocks will be sectioned in 1mm2 beams and tested in a universal testing machine according to the ISO/TS 11405:2003. Weibull distribution will be used for group comparison regarding adhesive bond strength, Weibull modulus, and probability of survival which will be calculated as a function of the microtensile means observed throughout testing. Fractographic analysis will be performed for identification of the interfaces involved in failure as well as for the detection of the direction of crack propagation.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE OLIVEIRA LINO, LUCAS FRACASSI; MACHADO, CAMILA MOREIRA; DE PAULA, VITOR GUARCONI; VIDOTTI, HUGO ALBERTO; COELHO, PAULO G.; BENALCAZAR JALKH, ERNESTO BYRON; PEGORARO, THIAGO AMADEI; BONFANTE, ESTEVAM AUGUSTO. Effect of aging and testing method on bond strength of CAD/CAM fiber-reinforced composite to dentin. Dental Materials, v. 34, n. 11, p. 1690-1701, NOV 2018. (12/19078-7, 16/18818-8, 14/18463-0, 18/03072-6)