Abstract:

Objective

To compare the coronal leakage of different length of gutta-percha remnants（full length， 3， 5， 7mm） two weeks after post preparation， using a dye penetration method.

Methods

Eighty-six single-root extracted teeth were divided into eight groups according to the length of gutta-percha remnant and the materials of temporary coronal filling. Teeth were instrumented and obturated in a routine way. Post space was prepared to different depths. Specimens were then submerged in 2% methylene blue dye for two weeks. Dye leakage was measured and statistical analysis was performed.

Results

Dye leakage was observed in all groups. The highest leakage was recorded in group A4 with 3mm-long gutta-percha remnant and coronal sealing of gutta-percha， whereas the lowest leakage was recorded in group B1 with full length of gutta-percha and coronal sealing of ZOE cement. However， there was no statistically significant difference among eight groups （P=0.1033）.

Conclusions

The post space preparation would decrease the sealing ability of root canal filling. Gutta-percha showed poorer sealing ability than ZOE cement as coronal temporary filling materials. However， there was no significant difference between them in 2 weeks.

Key words: Post space preparation, Coronal leakage, Dye penetration method