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Type: Artigo
Title: Effect of therapeutic dose X rays on mechanical and chemical properties of esthetic dental materials
Author: Cruz, Adriana Dibo da
Sinhoreti, Mário Alexandre Coelho
Ambrosano, Gláucia Maria
Rastelli, Alessandra Nara de Souza
Bagnato, Vanderlei Salvador
Bóscolo, Frab Norberto
Abstract: The aim of this study was to investigate the influence of therapeutic dose X rays on the microhardness (MH) and degree of conversion (DC) of two different esthetic restorative dental materials. The materials were photo-activated with a LED light-curing unit using three cure-times: 5, 20 and 40 seconds. The photo-activation was carried out in two distinct periods: before and after irradiation with doses of 5, 35 and 70 Gy, from a 6 MV X rays beam. In accordance with the methodology used, it was conclude that a therapeutic dose does not have a detrimental effect on the photoinitiator molecules, because the photo-activation occurred after they were irradiated. When the irradiation was applied before photo-activation, the materials showed MH improvement, but when photo-activation was performed after irradiation, there was less improvement. However, there was no correlation between MH and DC. Thus, a therapeutic dose applied to cured material can promote linking and breaking of chain bonds in a non-linear way.
Subject: Radiação ionizante
Materiais dentários
Country: Brasil
Editor: UFSCar/Departamento de Engenharia de Materiais
Rights: Aberto
Identifier DOI: 10.1590/S1516-14392008000300014
Date Issue: 2008
Appears in Collections:FOP - Artigos e Outros Documentos

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