title: Root length, crown height, and root morphology in Turner syndrome.
abstract: Root length, crown height, and root morphology were studied on intraoral and panoramic radiographs in 33 Turner syndrome patients aged 7.0-16.7 years, subdivided on the basis of karyotype. Thirty-three normal girls aged 10.2-16.4 years served as controls. In the 45X patients and, with the exception of a few teeth, also in the isochromosome and mosaic karyotypes, root length and crown height of incisors, canines, and premolars were significantly reduced. Some teeth showed altered crown-root proportions. Maxillary first premolars showed a significantly increased number of two-rooted and three-rooted variants. Mandibular premolars and molars had a complex root morphology, and a classification system was established including four premolar and six molar root types. Premolars had a significantly increased number of root components. Some of the variants, such as a molar-like second premolar, are apparently specific for these patients. On several first molars a radix entomolaris was identified. Two separate mesial and one or two separate distal roots were also frequently seen. Our investigation demonstrates that X-chromosome deficiency influences root formation.
authors: Department of Orthodontics and Facial Orthopedics, School of Dentistry, University of Bergen, Norway.
authors: M
authors: M
authors: Midtbø
authors: A
authors: A
authors: Halse
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000473:pathology; D002648:Child; D003481:Cuspid / Q000000981:diagnostic imaging / Q000473:pathology; D003786:Dental Pulp Cavity / Q000002:abnormalities / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging / Q000473:pathology; D007621:Karyotyping; D008334:Mandible; D008437:Maxilla; D008963:Molar / Q000000981:diagnostic imaging / Q000473:pathology; D009030:Mosaicism / Q000235:genetics / Q000473:pathology; D009811:Odontometry; D011862:Radiography, Panoramic; D014070:Tooth / Q000000981:diagnostic imaging / Q000473:pathology*; D014092:Tooth Root / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000473:pathology*; D014424:Turner Syndrome / Q000000981:diagnostic imaging / Q000235:genetics / Q000473:pathology*; D014960:X Chromosome / Q000235:genetics