title: Number of roots and canals in maxillary first premolars: study of an Andalusian population.
abstract: A study of 150 extracted maxillary first premolars from citizens of Seville, Andalusía, southern Spain, revealed 60 teeth with one root (40.0%), 85 teeth with two roots (56.7%) and five teeth with three roots (3.3%). The distribution of root canal shapes in the sample showed that all teeth with two or three roots had type I root canals (each canal had one apical foramen). Conversely, most of the single-rooted maxillary first premolars had root canal shape type II (two canals converging in the same apical foramen). Only 1.3% of the teeth had a unique orifice in the pulp chamber and only one root canal. These results emphasized the importance of good knowledge of the root canal morphology and the need for a careful radiographic examination as part of competent root canal therapy of maxillary first premolars.
authors.affiliation: Department of Dental Pathology and Therapeutics, University of Seville, School of Dentistry, Spain.
authors.forename: A J
authors.initials: AJ
authors.lastname: Chaparro
authors.forename: J J
authors.initials: JJ
authors.lastname: Segura
authors.forename: E
authors.initials: E
authors.lastname: Guerrero
authors.forename: A
authors.initials: A
authors.lastname: Jiménez-Rubio
authors.forename: C
authors.initials: C
authors.lastname: Murillo
authors.forename: J J
authors.initials: JJ
authors.lastname: Feito
mesh_terms: D001641:Bicuspid / Q000033:anatomy & histology*; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla; D013030:Spain; D014092:Tooth Root / Q000033:anatomy & histology*; D044465:White People