title: An in vitro histological comparison of the step-back, sonic, and ultrasonic instrumentation techniques in small, curved root canals.
mesh_terms: D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D003804:Dentin / Q000033:anatomy & histology; D004867:Equipment Design; D006801:Humans; D012390:Root Canal Therapy / Q000295:instrumentation* / Q000379:methods; D013016:Sound; D014464:Ultrasonic Therapy / Q000295:instrumentation*