title: Incidence of extra root canals in maxillary permanent first molar and its significance.
authors.forename: S M
authors.initials: SM
authors.lastname: Abdel-Aziz
authors.forename: M M
authors.initials: MM
authors.lastname: Gomaa
mesh_terms: D003786:Dental Pulp Cavity / Q000002:abnormalities* / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla; D008963:Molar / Q000002:abnormalities / Q000033:anatomy & histology; D012390:Root Canal Therapy