Coronal Leakage Evaluation of Two Differents Barrier Materials

Methods: Forty single root extracted human maxillary teeth divided into three experimental group of ten and two control group of five. All root canals were cleaned and shaped and except positive control group obturated with Gutta Percha and AH26 sealer with lateral compaction method and incubated in100% humidity for 72 hours. Post spaces were prepared with Peezo reamer number 3. Remaining Gutta Percha was 3 mm in two experimental groups and 2 mm of MTA or Zinc Oxide-Eugenol placed over it. In one experimental group 5 mm of Gutta Percha remained in apical third without any material over it. In experimental and positive control groups all roots surfaces except coronal part covered with two layers of nail polish and sticky wax. In negative control group all roots surfaces covered with two layers of nail polish and sticky wax. All teeth immersed in Methylene blue two days. Coronal dye leakage evaluated after washing and splitting of teeth. A newman-Kules multiple comparison test at the 0.05 level of significance was used to evaluate the statistical differences between groups.

Results: All the canals in positive group demonstrated leakage through out the entire root lengths. The canals in negative control group did not show any leakage. There were significant differences between MTA and Zinc Oxide-Eugenol and and Gutta Percha. MTA demonstrated the least and Gutta percha the most leakage.

Conclusions: Using MTA coronal barrier over remaining Gutta percha in post space was strongly recommended.