The effect of 30% at-home bleaching on surface hardness of esthetic restorative materials

Abstract

in vitro study to evaluate the effect of an at-home bleaching product on the
surface hardness of three composite restorative materials.
The aim of this study was to evaluate the effect of at-home bleaching on the
surface hardness of the tooth colored restorative materials.
Thirty specimens were prepared; 10 specimens of each material 5 specimens
control of each group. All specimens were stored in distilled water at room
temperature for 24 hrs before testing. A universal testing machine (Micromet micro
hardness testers) was used for testing brinell surface hardness for the three groups&
for every tested material. Three tested materials was assessed by ANOVA& further
exploration between all possible paired combination of tested material was assessed
by bonferroni adjusted t-test p value less than 0.05 was considered statistically
significant .
The statistical analysis showed that at home bleaching technique have statistically
significant effect of the micro hardness of composite resin.
At-home bleaching agents have a softening effect on some tooth
colored restorative material, and the patient must be aware before using them.