title: Three-rooted mandibular molars in patients of Mongolian, Caucasian and Negro origin.
abstract: A total of 328 periapical x-rays from 105 patients of Mongolian origin, 106 of Negro origin and 117 of Caucasian origin were studied. The Mongolian race showed a greater incidence of three-rooted mandibular molars (15.2% of the Mongolian patients, 7.5% of the Negro patients and 6.8 of the Caucasian patients). There was no statistical difference in relation to sex and the incidence of this extra root.
authors.affiliation: Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Brazil.
authors.forename: J A
authors.initials: JA
authors.lastname: Ferraz
authors.forename: J D
authors.initials: JD
authors.lastname: Pécora
mesh_terms: D044466:Asian People; D044383:Black People; D001938:Brazil / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008963:Molar / Q000002:abnormalities*; D017678:Sex Distribution; D014071:Tooth Abnormalities / Q000208:ethnology*; D044465:White People