the effect of mineral trioxide aggregate mixed with chlorhexidine as direct pulp capping agent in dogs teeth: a histologic study

introduction: the aim of the present investigation was to compare the efficacy of mineral trioxide aggregate (mta) and 0.2% chlorhexidine (chx) mixture to pure mta, as a pulp capping material. methods and materials: the pulp of 24 lateral incisors and canines from four dogs were exposed and capped either with mta or mta+0.2% chx. after 2 months the animals were sacrificed and the teeth were prepared for histological evaluation in terms of calcified bridge formation, the degree of inflammation and presence of necrosis. the fisher’s exact test was used for data analysis. results: the results showed that formation of complete calcified bridge in mta specimens was significantly more than mta+chx ( p <0.05). no significant difference was found in the degree of inflammation and necrosis between mta and mta+chx groups ( p >0.05). conclusion: mixing mta with chx as pulp capping agent had a significant negative impact on formation of calcified bridge on directly capped dog’s teeth.