title: Apex locators: a systematic approach for usage.
authors: University of Pennsylvania, School of Dental Medicine, Philadelphia.
authors: A B
authors: AB
authors: Einbinder
authors: S I
authors: SI
authors: Kratchman
mesh_terms: D003748:Dental Equipment; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D006801:Humans; D012390:Root Canal Therapy / Q000295:instrumentation*; D014092:Tooth Root / Q000033:anatomy & histology