تأثير التنشيط الضوئي لمادة بيروكسيد الهيدروجين ذات التركيز المرتفع في قساوة الميناء السنية

الملخص EN

Background and Objective: since teeth whitening is very important procedure in dental office.

the effect of peroxides on enamel tissue is of great interest in research.

The aim of this in vitro study was to perform a qualitative analysis of the human enamel microhardness after the application of high concentration of hydrogen peroxide (38%)with and without light activation, using Vickers microhardness tests.

Materials & Methods: 15 upper third molars were extracted.

Each crown was sectioned into 3 parts which surrounded with three acrylic blocks.

So that we have 45 dental blocks distributed into 3 groups: Group(A): control group(15 blocks) no bleaching treatment was performed.

Group(B): (15 blocks) were placed in contact with whitening material(Opalescence 38%).Group(C) : (15 blocks) were submitted to the same material but with light activation.

specimens were stored in artificial saliva for 7 days .then, were submitted to vickers microhardness tests & T-S test At p<0.05.

Results: enamel microhardness of group(B) decreased 96.1kg/mm2 when comparing with control group, whearas group ( c) decrease was 168.41kg/ mm2.

with a significant statistical difference (p<0.05).

Conclusion :High concentration of teeth whitening materials affected enamel microhardness & Light activation affected enamel microhardness more clearly .