Methods: In this experimental study, 72 extracted human permanent maxillary central incisors were decoronated to a standardized length of 10±1 mm. After preparation of root canals, 1 mm depth cavities were prepared on the root at 3 and 6 mm from the apex. The teeth were randomly divided into 5 experimental groups and a control group (n=12). Root canals of experimental matched pairs were filled with either MTA, CH, BD, ES, or CEM cement; control teeth were filled with distilled water. The pH in root surface cavities was measured at 4, 24, and 48 hours, and 1, 2, 3, and 4 weeks. Repeated measurement ANOVA was used for statistical analyses. Significant was set at (P<0.05).
Results: In experimental groups the pH at 6 mm was statistically higher than 3-mm level (P<0.05). Overall, pH in all groups gradually reduced during 4 weeks; CH had the highest PH and MTA, CEM cement, BD, ES respectively. There were no significant differences between MTA and CEM cement, ES and BD at 24 and 48 hours, 2, 3, 4 weeks (P<0.05).
Conclusions: All of the material could increase the pH level on surface resorptive defects during 4 weeks.