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

ABSTRACT

Objective: This study evaluates the effect of calcium hydroxide dressing on microleakage of composite restorationsfollowing non-vital bleaching. Methods: A total of 45 sound extracted human maxillary central incisorsunderwent endodontic treatment. The teeth were randomly divided into three groups (n=15). In group 1, accesscavities were restored with composite. In group 2, the teeth underwent a bleaching procedure for one week beforebeing restored with composite. In group 3, following a bleaching procedure, calcium hydroxide paste was placedin the pulp chamber for one week. The teeth were then restored with composite. The specimens were subjected toa dye leakage test. The data was analyzed using Kruskal-Wallis and Mann-Whitney U tests. Results: There weresignificant differences between the groups (P<0.0005). No statistically significant differences were found betweengroups 2 and 3, while the differences between other groups were significant. Conclusions: The bleaching agentincreased microleakage of composite restorations in non-vital bleaching, whereas microleakage was not found tobe increased by calcium hydroxide (AU)