Study on the obturation effect of two tapered gutta-percha cone on canals with different shape

LI Hong-mei

Abstract：AIM: To compare the obturation effect of two tapered gutta - percha master cone using cold later al condensation on different shape canals. METHODS: Forty extracted teeth with a single canal were divided into two groups, round carnal group and oval canal group. The canals were instrumented by M2 and obturated with 0.02 or 0.06 master cone by cold laterally condensed method. X - ray films of each teeth from buccal - lingal and mesio - distal di rection were taken. All the teeth were cut horizontally at the 3 and 5 mm from the apex, and micro - photographs of the cross sections were taken. The percentage of gutta - percha filled area was measured using an image analysis program. Obturation time consumed were recorded. RESULTS: The qualities of X - ray films of mesio - distal direction of oval shape canals were worse than those of buccal - lingal direction. In round canals, there was no difference of PGP( percentage of gutta-percha filled area) between0.06 and 0.02 cones at 3mm level(P>0.05) , while in oval canals, the PGP with 0.02 cones was higher than that of 0.06 cones (P < 0.05). At 5mm level, there was no significant difference between 0.06 and 0.02 cones (P > 0.05 ). Time consumed with 0.06 cones was shorter than that with 0.02 cones. CONCLUSION: In clinic, wed better choose 0.06 tapered master gutta - percha whose taper is close to that of round canals, which will be time - saving and better effects. While in oval canals, with regards to the obturation of bucca - lin gal, 0.02 tapered gutta - percha cones may be the better choice.