Effect of calcium hydroxide dressing on microleakage of composite restorations in endodontically treated teeth subsequent to bleaching

• DOI: 10.4317/medoral.15.e413
• Publication Date: 2010-03-03T19:26:20Z
• Authors: S. Rahimi; S. Shahi; S. Kimyai; L. Khayyam; M. Abdolrahimi
• Keywords: Calcium Hydroxide; Dental Leakage; Tooth, Nonvital; 03 medical and health sciences; 0302 clinical medicine; UNESCO::CIENCIAS MÉDICAS; Tooth Bleaching; Humans; :CIENCIAS MÉDICAS [UNESCO]; Bandages

This study evaluates the effect of calcium hydroxide dressing on microleakage of composite restorations following non-vital bleaching.A total of 45 sound extracted human maxillary central incisors underwent endodontic treatment. The teeth were randomly divided into three groups (n=15). In group 1, access cavities were restored with composite. In group 2, the teeth underwent a bleaching procedure for one week before being restored with composite. In group 3, following a bleaching procedure, calcium hydroxide paste was placed in the pulp chamber for one week. The teeth were then restored with composite. The specimens were subjected to a dye leakage test. The data was analyzed using Kruskal-Wallis and Mann-Whitney U tests.There were significant differences between the groups (P<0.0005). No statistically significant differences were found between groups 2 and 3, while the differences between other groups were significant.The bleaching agent increased microleakage of composite restorations in non-vital bleaching, whereas microleakage was not found to be increased by calcium hydroxide.