An in vitro comparison of incomplete root fractures associated with three obturation techniques.

This study compared the incidence of incomplete root fractures among five groups of mandibular incisors (20/group). The groups were: (a) no canal preparation, (b) canal preparation, (c) canal preparation and obturation with laterally condensed gutta-percha, (d) canal preparation and obturation with thermoplasticized gutta-percha on a central carrier (Thermafil), and (e) canal preparation and obturation with thermoplasticized injectable gutta-percha (Ultrafil). Following experimental manipulation, all teeth were stained, transversely sectioned, and evaluated for the presence of root fracture.