title: The relationship between the incisor position and lingual surface morphology in normal occlusion.
abstract: This study aimed to investigate the relationship between the morphological characteristics of maxillary incisors and the anterior occlusion. The study materials comprised dental casts and lateral cephalograms of 26 modern Mongolian females with Angle Class I normal occlusion (mean age, 21 years 5 months). Computed tomography (CT) images of the dental casts were taken with an X-ray micro-CT system (SMX-100CT, Shimadzu, Kyoto Japan). The thickness of the marginal ridges and incisal edges, and the overjet and overbite, was measured on the three-dimensional images of the dental casts. On the lateral cephalogram, maxillary incisor to sella-nasion plane angle (U1 to SN angle), maxillary incisor to nasion-point A plane distance (U1 to NA distance), mandibular incisor to nasion-point B plane distance (L1 to NB distance), incisor mandibular plane angle, and interincisal angle were measured by tracing the left incisors of the maxilla and mandible. Spearman's single rank correlation coefficients were used to investigate any correlation between measurement items for each maxillary incisor. The thickness of the marginal ridges and incisal edges was positively correlated with the overbite. The thickness of the incisal edges was positively correlated with the irregularity index of the maxilla. There were significant negative correlations between overbite and U1 to SN angle, U1 to NA distance, and L1 to NB distance. Significant positive correlations were noted between the overbite and the overjet. In conclusion, there was no strong relationship between the morphological characteristics of maxillary incisors and the anterior occlusion.
authors.affiliation: Department of Orthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-chou, Chuo-ku, Niigata, 951-8580, Japan. haseyu@ngt.ndu.ac.jp.|Orthodontics and Dentofacial Orthopedics, The Nippon Dental University Graduate School of Life Dentistry at Niigata, Niigata, Japan. haseyu@ngt.ndu.ac.jp.
authors.forename: Yuh
authors.initials: Y
authors.lastname: Hasegawa
authors.affiliation: General Dentistry, The Nippon Dental University Niigata Hospital, Niigata, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Ezura
authors.affiliation: Department of Orthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-chou, Chuo-ku, Niigata, 951-8580, Japan.|Orthodontics and Dentofacial Orthopedics, The Nippon Dental University Graduate School of Life Dentistry at Niigata, Niigata, Japan.
authors.forename: Batbayar
authors.initials: B
authors.lastname: Nomintsetseg
mesh_terms: D002508:Cephalometry; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D008311:Malocclusion, Angle Class I / Q000000981:diagnostic imaging* / Q000473:pathology*; D008437:Maxilla / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D003765:Models, Dental; D008986:Mongolia; D055114:X-Ray Microtomography; D055815:Young Adult
keywords: Anterior occlusion; Marginal ridge; Maxillary incisor; Micro-CT; Mongolian