اثر سديم پربورات همراه با غلظت هاي متفاوت H2O2 بر روي دندان هاي تغيير رنگ يافته درمان ريشه شده انسان به صورت آزمايشگاهي

Bleaching effect of sodium perborate mixed with four different concentrations of H202 on artificial stained pulpless teeth

Background and Aim: The use of various techniques of teeth bleaching as a conservative and low-cost procedure is common and generally accepted today. The purpose of this study was to evaluate the bleaching cffect of sodium perborate mixed with four different concentrations of II202 on artificial stained pulpless teeth. Materials & Methods: In this experimental single-blind study, 64 extracted human premolars were stained in vitro with human RBCs mixed with iron sulfide II, and randomly divided into 4 test groups and one control group. The bleaching agents of sodium perborate mixed with 7.5%, 15% and 30% H202 and distilled water were placed in pulp chambers of the teeth. The bleaching effects of each group were evaluated using a digital camcra and L*a*b system. Adobe Photoshop 7.0 software was used to measure the color changes through the procedure. AE was used to describe color changes numerically. The data were analyzed by Kolmogorov Smirnov, ANOVA and SPSS Ver. 9.0 software. Results: The results revealed that sodium perborate mixed with II202 30% significantly had more whitening effect than the other groups (P=0.001), but there was no significant difference among the bleaching cffcct of the other groups. Conclusion: The most bleaching cffcct was gained by H202 30% .On the other hand due to no significant difference between 15% and 7.5% of H202 with water, using sodium perborate mixed with water is one of the safest methods in teeth bleaching.