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"effect of different temperatures of volatilization of solvents in adhesive systems on their degree of conversion and different wet bonding techniques on the stability of adhesive interface"

Grant number: 11/07984-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2011
Effective date (End): July 29, 2014
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Giselle Maria Marchi Baron
Grantee:Larissa Sgarbosa de Araújo Matuda
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
Associated scholarship(s):12/08944-5 - Effect of the association of proanthocyanidins and adhesives volatilization in the stability of the hybrid layer, BE.EP.DR

Abstract

The objective of this study will be to evaluate the influence of different temperatures for volatilization of solvents on the degree of conversion (DC) of adhesive systems and bond strength (BS) of adhesive interface subject to water or ethanol wet bonding technique as well as to evaluate the degradation of the adhesive interface after 12 months. One hundred and eight third molars humans will be divided into 12 groups for the BS, according to the type of adhesive used [one-step (OS), Excite (EX) and Single Bond 2 (SB)], union technique (alcohol and water) and temperature of volatilization (± 23 C; ± 40 degrees C). For measurement of DC (n = 5), 6 groups will be assessed, in accordance to the type of adhesive used (OS, EX, SB) and temperature volatilization (± 23; ± 40 degrees C). After volatilization of the solvents, the degree of conversion will be evaluated through the infrared transmission spectroscopy (FTIR) Fourier transform in 1665 the 1580 cm-1. The teeth that will be used in this study will have their roots and the coronary enamel removed in metallographic precision cutter. The occlusal surfaces of the third mollars will be flated. The exposed dentin will be etched with 37% phosphoric acid and rinsed with water. In groups where the alcoholic technique is applied, the water present in the dentin is replaced by 100% ethanol. Adhesive systems (OS, EX, SB) will be applied according to the group in question. The composite Filtek Z350 will be used to manufacture restorations (4x4x8mm) in increments of 2 mm, photoactivated through LED Bluephase-2 for the time recommended by manufacturers. For the test of BS (n = 6), the teeth will be sectioned for obtaining beams. Will be obtained approximately 15 beams of each tooth being 7 for 7 for aging and RU in distilled water for a period of 12 months in an oven at 35ºc. For the test, the toothpicks will be coupled to the findings in the universal testing machine (0.5 mm/min). Three additional third molars for each experimental group will be used for qualitative analysis of adhesive interface in confocal laser scanning microscopy (MVLC) and scanning electron microscopy (SEM). The data obtained will be submitted to the appropriate statistical analysis. (AU)