title: [Prevalence of malocclusions and demand for orthodontic treatment among students at a women's high school].
abstract: Prevalences of malocclusions were investigated in a sample of 3,520 girls recorded between 1984 and 1986 at a private high school. Also, proportions of students who had received and were under treatment were surveyed for 3,501 students in 1989. In addition, ratios of a number of those who were judged to reveal maxillary protrusion with respect to that of the whole sample examined were evaluated as a function of overjet. The results of the surveys are as follows. SURVEY I) A total prevalence of malocclusion was 57.9% in the Grade 7 (G7) and 56.4% in the Grade 10 (G10). Among malocclusions surveyed, maxillary protrusion was found in 8.1% of the G7 and in 7.8% of the G10. Deep overbite was determined in 7.9% of the G7 and in 7.6% of the G10, mandibular protrusion was found in 2.4% of the G7 and in 2.7% of the G10. Edge-to-edge incisor relationships were determined in 6.4% of the G7 and in 7.6% of the G10. Anterior open bite was found in 2.4% of the G7 and in 2.9% of the G10. Crowding was found in 37.3% of the G7 and in 33.9% of the G10. SURVEY II) Prevalence of students who had orthodontic treatment at the time of survey, was 6.4% in the G7, 7.0% in the G8, 6.0% in the G9, 6.0% in the G10, 5.4% in the G11, and 3.6% in the G12. Those who had had orthodontic treatment revealed proportions of 8.1% in the G7, 8.0% in the G8, 7.7% in the G9, 11.3% in the G10, 12.2% in the G11, and 13.7% in the G12 students. SURVEY III) A proportion of 73.5% of those who had overjets more than 6 mm were judged to have maxillary protrusion.
authors: Department of Orthodontics, Osaka University Faculty of Dentistry, Japan.
authors: N
authors: N
authors: Kitai
authors: K
authors: K
authors: Takada
authors: Y
authors: Y
authors: Yasuda
authors: S
authors: S
authors: Adachi
authors: E
authors: E
authors: Hirase
authors: T
authors: T
authors: Kitaguchi
authors: M
authors: M
authors: Sakuda
mesh_terms: D000293:Adolescent; D005260:Female; D006301:Health Services Needs and Demand; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008310:Malocclusion / Q000453:epidemiology* / Q000628:therapy; D009971:Orthodontics, Corrective; D015995:Prevalence