Abstract : This study evaluated the physical properties, sealing ability and tissue irritant of newly-developed paste-paste sealers (Normal type, Quick type), and compared them with a zinc oxide-eugenol sealer, Canals, as a control.
The findings were as follows :
1. With the paste-paste type, the appropriate quantity for use could be easily controlled, and mixing procedure was easier and faster than for Canals.
2. The physical properties of the Normal type and Quick type showed values within the limits of the ISO standard.
3. Two types with different operation time were formulated to allow for different situations of root canal filling operation.
4. No significant differences were found among the tested materials in an apical dye leakage study by the methods of lateral condensation and heating gutta-percha. Both the Normal and Quick types showed the same degree of leakage as Canals, and apical sealing ability was suggested to be equal for clinical use.
5. The histopathological view showed a very slight inflammatory change at periapical tissue compared with a pulp chamber organization. The Normal type, Quick type and Canals showed similar extent of inflammatory change and are expected to be safe for clinical use.
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