Effect of bleaching treatment on element content of enamel

The aim of study was to evaluate the mineral changes caused by enamel bleaching treatments at different application times by scanning electron microscope- energy dispersive X-Ray (SEM-EDX). In this study, 36 teeth were divided into 3 groups after mineral measurements (Flour, Silicon, Aluminum, Strontium) with SEM-EDX (n ₌ 12). 40% hydrogen peroxide gel was used for bleaching in all groups. Bleaching was performed 20 min for Group 1, 40 min for Group 2, 60 min for Group 3. Mineral measurements were performed with SEM-EDX after treatment. In the intra-group comparison, although there was no significant difference between Flour (F) and Silicon (Si) values (p ˃ 0.05), there was statistically significant difference in Aluminum (Al) and Strontium (Sr) values (p < 0.05). After the bleaching process for different application times, mineral change was observed in time-depending comparison. The best results were obtained for Group 2, appling according to manufacturer's instructions.