Loss of weight of materials used in mechanical sealing of non-vital teeth submitted to bleaching agents

Abstract

To evaluate the loss of weight of two glass ionomers (GIC) Vidrion R® (VR) and Vitremer® (VT) which were submitted to bleaching agents: 37% Carbamide Peroxide (CP) and 35% Hydrogen Peroxide mixed with Sodium Perborate (PP) using Zinc Phosphate (ZP) cement as control. The influence of the storage time since the sample preparation until the whitening application (used right after the restoration or 24 hours later).Seventy (70) samples were divided into 10 groups: in the odd the materials were utilized immediately after the sample preparation; in the even, 24 hours later with the following distribution. The weight chance of these specimens were measured before the immersion in bleaching agents and 21 days after using the analytical balance. Mean value and SD was calculated and data was analyzed using ANOVA/Kruskal-Wallis test at a 0,01 significance level. VT proved to be less soluble than VD R and not show any estatistically significance difference in comparison with ZP.