Abstract
Aims: The aim of this in vitro study was to evaluate the coronal seal of root canals prepared by two NiTi systems. Materials and Methods: Thirty-six extracted human teeth with single root canal were decoronated at the cemento-enamel junction (CEJ). The working length was determined for each tooth. Thirty teeth were divided into three groups ten of each. Group I teeth were prepared by Pro-Taper NiTi rotary instruments, then obturated by matched-taper single cone. Group II teeth were prepared by Ra-Ce NiTi rotary instruments and obturated also by matched-taper single cone. Group III teeth were pre-pared by hand K-files instrument then obturated by gutta percha lateral condensation technique. Re-maining teeth were used as control group, three positive and three negative control. Tgadeseal was used as root canal sealer for all groups in this study. Dye penetration method was used to evaluate the coro-nal seal using a steromicroscope at 40X magnification. All teeth (experimental group and control groups) were longitudinally sectioned for examination of dye penetration. One-way analysis of vari-ance and Duncan's tests was used for statistical analysis. There was significant differences between the groups (p< 0.05). Results: Statistical analysis of the results demonstrated that there was no statistical significant difference in coronal seal between the two systems. While, there was a significant differ-ence between the two rotary Ni-Ti systems and the hand K-files instrument. Conclusion: The use of Ni-Ti rotary instrument for root canal preparation shows least coronal microleakage in comparision with hand K-files instrument.
