title: Endodontic retreatment--unusual anatomy of a maxillary second and mandibular first premolar: report of two cases.
abstract: An accurate diagnosis of the morphology of the root canal system is a prerequisite for successful root canal treatment. A major cause of endodontic treatment failure in missed (or) untreated root canals is that they still harbor infection. Careful radiographic interpretation and examination of pulp chamber floors are helpful in locating root canal entrances. These case reports present anatomical variations in upper and lower premolars.
authors.affiliation: Department of Conservative Dentistry, Yenepoya Dental College, Deralakatte, Mangalore, India.
authors.forename: Amarnath
authors.initials: A
authors.lastname: Shenoy
authors.forename: Nagesh
authors.initials: N
authors.lastname: Bolla
authors.forename: Sayesh
authors.initials: S
authors.lastname: Vemuri
authors.forename: Jacob
authors.initials: J
authors.lastname: Kurian
mesh_terms: D000328:Adult; D063405:Anatomic Variation; D001641:Bicuspid / Q000473:pathology*; D003786:Dental Pulp Cavity / Q000473:pathology*; D004853:Epoxy Resins / Q000627:therapeutic use; D005260:Female; D005500:Follow-Up Studies; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D008297:Male; D008334:Mandible; D008437:Maxilla; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D012390:Root Canal Therapy / Q000379:methods*
chemical_list: D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; D006171:Gutta-Percha