Influence of Different Thickness in the Degree of Conversion of an Adhesive Resin.

Abstract

Aim: the purpose of this study was to evaluate the degree of conversion (DC) of different thicknesses (1, 2, 3 and 4 mm) of a translucent dental adhesive resin Materials and Methods: the degree of conversion (DC) of adhesive resins was measured by Fourier Transform Infrared Spectroscopy (FTIR) equipped with an attenuated total reflectance device (ATR). It were used four matrices of polyvinylsiloxane with dimensions of 1; 2; 3 or 4 mm in thickness and 7 mm in diameter each one to contain the dispensed adhesive (n = 3) on the diamond crystal of the ATR device. The data were analyzed by one-way ANOVA and Student-Newman-Keels’ post hoc test (α=0.05). Results: specimens of 1 mm of thickness showed statistically higher DC (62.19 ± 0.20) compared to the other groups (p<0.05). The DC of specimens of 2 mm did not differ from specimens of 3 mm in thickness (p>0.05), but groups of 2 and 3 mm showed higher DC than the group of 4 mm (p<0.05). Conclusion: the standardization of the thickness of the specimens for DC assay using FTIR-ATR is necessary.