Abstract
The purpose of this study was to determine the prevalence of juvenile periodontitis and periodontal disease in Japanes young sters in their early teens. The survey was conducted on 2, 980 junior high school students (12 to 15 years of age), living in Kawagoe, Japan.
The examination was carried out in three parts. In the first, inflammation of the gingiva was assessed in terms of redness, swelling, and bleeding. Secondly, pocket depth was measured by the circumfirential method, Thirdly, radiographs and study casts were taken on those individuals who had one or more periodontal pockets (probing depth>4mm).
1. 3.6% of junior high school students had gingivitis. Male had a higher prevalence of gingivitis than females, but it was less severe in the former.
2. 1.4% of the examined students showed a pocket depth than 4 mm.
3. The average pocket depth and prevalence of deep pockets were in the following order; maxillary incisors>mandibular incisors>first molar.
4. There were no defects in alveolar bone upon radiographic examination.
Twenty nine students were chosen for the study of orthodontic problems.
5. It was observed that malocclusion was 24.1%; malposition, 79.3%; and deep over bite and over jet, 87.8%. 6. A tendency toward gingivitis was observed over jet. more frequently in those with deep over bite and
