Long-term evaluation of the bond strength, nanoleakage patterns and ultramorphological characteristics of resin-dentin interfaces produced by self-adhesive cements

• Grant number: 07/06447-6
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2008
• Effective date (End): February 28, 2010
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: André Figueiredo Reis
• Grantee: Alline de Cerqueira Kasaz
• Host Institution: Universidade de Guarulhos (UNG). Campus Guarulhos-Centro. Guarulhos , SP, Brazil

Abstract

The aim of this project will be to evaluate the effects of water exposure on the microtensile bond strength, on the nanoleakage patterns and on the ultramorphological characteristics of resin-dentin interfaces produced by different self-adhesive resin-based cements. Five self-adhesive cements will be used: RelyX Unicem (3M Espe), Breeze (Pentron), BisCem (Bisco), G-Cem (GC America), Maxcem (Kerr); and two conventional resin cements (Rely X ARC, 3M Espe; and Panavia F, Kuraray). Eighty-four third molars will be used, which will be randomly distributed into 7 groups according to the luting material, and then subdivided into 3 subgroups according to water exposure method: 24 hours, 12 months with a circumferential enamel margin and 12 months with dentin margins. Pre-polymerized composite cylinders will be cemented according to manufacturers’ instructions. After the storage periods, the restored teeth (n=4) will be serially sectioned, producing beams with a cross-sectional area of 0.8 mm2 at the resin-dentin interface, which will be tested in tension in a universal testing machine. Teeth luted with each material will be submitted to a nanoleakage protocol with AgNO3 after each storage period (n=4) and will be prepared for observation in a Scanning and Transmission Electron Microscope. Two additional specimens in each group will be prepared for ultrastructural observation of the resin-dentin interface with the TEM for the determination of the interaction mechanism between these materials and dentin. The bond strength and nanoleakage data will be statistically analyzed by two-way ANOVA and Tukey test.

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)

CÉSAR AUGUSTO GALVÃO ARRAIS; ALINE DE CERQUEIRA KASAZ; LUÍS GUSTAVO BARROTE ALBINO; JOSÉ AUGUSTO RODRIGUES; ANDRE FIGUEIREDO REIS. Effect of curing mode on the hardness of dual-cured composite resin core build-up materials. Brazilian Oral Research, v. 24, n. 2, p. 245-249, 2010-06-00. (07/06083-4, 07/06447-6)

VIOTTI, RONALDO G.; KASAZ, ALLINE; PENA, CARLOS E.; ALEXANDRE, RODRIGO S.; ARRAIS, CESAR A.; REIS, ANDRE F.. MICROTENSILE BOND STRENGTH OF NEW SELF-ADHESIVE LUTING AGENTS AND CONVENTIONAL MULTISTEP SYSTEMS. JOURNAL OF PROSTHETIC DENTISTRY, v. 102, n. 5, p. 306-312, NOV 2009. (07/06083-4, 07/06447-6)

KASAZ, ALLINE C.; PENA, CARLOS E.; DE ALEXANDRE, RODRIGO S.; VIOTTI, RONALDO G.; SANTANA, VERONICA B.; ARRAIS, CESAR A. G.; GIANNINI, MARCELO; REIS, ANDRE F.. Effects of a Peripheral Enamel Margin on the Long-term Bond Strength and Nanoleakage of Composite/Dentin Interfaces Produced by Self-adhesive and Conventional Resin Cements. Journal of Adhesive Dentistry, v. 14, n. 3, p. 251-263, JUN 2012. (07/06083-4, 07/06447-6)