MICROLEAKAGE OF HUMAN SALIVA THROUGH DENTINAL TUBULES EXPOSED AT THE CERVICAL LEVEL IN TEETH TREATED ENDODONTICALLY

This study investigated the possibility of saliva recontamination occu rring between the root canal wall and sealer through dentinal tubules exposed after the cementum was removed at the cervical level by root p laning and treatment with citric acid. Thirty-four extracted human max illary anterior teeth were randomly placed into five groups after chem omechanical preparation and obturation with gutta-percha and sealer; t he sealer was allowed to set for 48 h. A ring 3 mm high, at the cervic al level, was subjected to root planing, with complete removal of the cementum. All specimens were coated with two layers of nail polish and two layers of sticky wax, except for the ring subjected to root plani ng that was treated with citric acid for 30 s. The specimens were expo sed to human whole sativa for 20 to 80 days and then immersed in dye t o determine microleakage. Specimens were cleared and measurements made to the maximum point of dye penetration. All of the specimens exposed to saliva showed leakage except for the negative control, wherein no dye penetration was seen. Where leakage was found, the dye penetrated between the canal walls and the sealer to increasing depths, proportio nal to the time of exposure to the saliva. Statistical analysis confir med these data, evidencing a difference between the means, which was h ighly significant for all pairs.