Effect of therapeutic dose X rays on mechanical and chemical properties of esthetic dental materials

Materials Research

Adriana Dibo Da Cruz²  Mário Alexandre Coelho Sinhoreti²  Gláucia Maria Ambrosano²  Alessandra Nara De Souza Rastelli¹  Vanderlei Salvador Bagnato¹  Frab Norberto Bóscolo² 

[1] ,UNICAMP Piracicaba Dentistry School Piracicaba SP ,Brazil

关键词: ionizing radiation;    radiotherapy;    spectroscopy;    Fourier transform infrared;    dental materials;   

DOI  :  10.1590/S1516-14392008000300014

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License