Eshagh-ali Saberi - Department of Endodontics, Faculty of Dentistry, Zahedan University of Medical Sciences, Zahedan, Iran
Shahram Shahraki - Department of Microbiology, Faculty of Medical Sciences, Zahedan University of Medical Sciences, Zahedan, Iran
Sediqe Ebrahimipour - Dental Research Center, Faculty of Dental School, Birjand University of Medical Sciences, Birjand, Iran
Anousheh Rashed Mohassel - Dental Research Center, Faculty of Dental School, Birjand University of Medical Sciences, Birjand, Iran

Introduction: The purpose of this study was to evaluate the sealing ability of 3 obturation techniques in oval-shaped canals by bacterial leakage assessment. Methods: Sixty mandibular incisors with oval canals were selected after providing buccolingual and mesiodistal radiographs. The teeth were sectioned at a 10 mm distance from the apex. After instrumentation, the teeth were divided into 3 groups and the canals in the three groups were obturated with lateral condensation (G1), warm vertical condensation (G2) and thermoplasticized injectable gutta percha (G3). The teeth were exposed to human saliva. Observing the turbidity of the BHI broth for a period of 63 days the number of days required for the complete contamination of root canals was recorded. The data were analyzed using descriptive statistical methods and Kruskal-Wallis test with SPSS statistical software. Results: Warm vertical condensation (G2) needed a significantly greater average time for leakage than the two other methods. No significant differences were found between lateral condensations and thermoplasticized injectable G.P techniques. Conclusion: warm vertical condensation provides a better seal against bacterial leakage than lateral condensation and obtura II method in obturating oval-canals.

Bacterial Leakage, lateral condensation, obtura, oval canal, warm vertical condensation