title: Instrumenting the isthmus: navigating the roots of permanent mandibular molars.
authors.forename: R E
authors.initials: RE
authors.lastname: Mortman
authors.forename: S
authors.initials: S
authors.lastname: Masyr
authors.forename: S
authors.initials: S
authors.lastname: Ahn
mesh_terms: D000328:Adult; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D008334:Mandible; D008875:Middle Aged; D008963:Molar / Q000033:anatomy & histology*; D018915:Root Canal Preparation; D014092:Tooth Root / Q000033:anatomy & histology*