title: Influence of shovel-shaped incisors on the dental arch crowding in Mongolian females.
abstract: The aim of this study was to investigate the influences of shovel-shaped incisors on the dental arch crowding in the samples of modern young female adult Mongolians (belonging to the Khalkha-Mogol grouping) ranged between 18.5 and 25.0 years, with a mean age of 20.7 years. Materials in this study comprised of 33 dental casts. Plaster replicas of the A.S.U. system plaques were used to facilitate standardization in scoring and classify shoveling regarding both upper central and lateral incisors. Dimensions of the dental arch namely, overjet, overbite, arch depth, arch width and irregularity index were measured. The correlation between the shovel shape of the central incisor and the lateral incisor was highly significant. Significantly relations were found between the grades of shoveling and the mesiodistal diameters of upper first molars and lower incisors. Positive correlation was admitted between the shoveling and upper arch depth anterior, and upper arch depth. It may be considered that the grades of shoveling are indirectly related with upper and/or lower anterior crowding. Although crowding is looks like an expression of disharmony between teeth and alveolar arch, it may be caused by multiple etiologic factors interacted directly and/or indirectly.
authors.affiliation: Department of Orthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8, Hamaura-chou, Chuou-ku, Niigata-city, Niigata, 951-8580, Japan. haseyu@ngt.ndu.ac.jp
authors.forename: Yuh
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Kazuto
authors.initials: K
authors.lastname: Terada
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kageyama
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Tsukada
authors.forename: Satoshi
authors.initials: S
authors.lastname: Uzuka
authors.forename: Rizako
authors.initials: R
authors.lastname: Nakahara
authors.forename: Sen
authors.initials: S
authors.lastname: Nakahara
mesh_terms: D000293:Adolescent; D000328:Adult; D003724:Dental Arch / Q000473:pathology*; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology*; D008310:Malocclusion / Q000209:etiology* / Q000473:pathology*; D003765:Models, Dental; D008986:Mongolia; D012189:Retrospective Studies; D055815:Young Adult