Classification of juvenile periodontitis in localized and generalized. Localized JP is sub-classified in typical and atypical. Another classification is given by Miller 1984 and Hormand 1979 with Class I - bone loss at molars and incisors, Class II - bone loss of all teeth in class I plus a few additional teeth ( fewer than 14 teeth ) and Class III - general bone loss with 14 or more teeth affected. Rapid progressive periodontitis ( early onset periodontitis ) may be closely related to the generalized form. Isolated bone loss on only a single tooth has been designated "acute localized destruction of alveolar bone" ( Baer 1974 )
The purpose of the study was to review a large number of full mouth radiographs of young adults clinically identified as having juvenile periodontitis ( JP ) in order to elucidate radiographic pattern of bone.
49,380 naval recruits were screened for JP using the criteria described by Baer 1971, Mason 1974, Miller 1948. Patients with clinical sign of JP were further examined and full mouth radiographs obtained. The radiographs were analyzed and classified regarding to the parameters described above ( Note ).
The results reveal that 270 out of 49,380 recruit showed clinical signs of JP and out of these 182 fulfilled the radiographic criteria for JP. The prevalence of JP in the studied population was 0.36%. The remaining 88 patients were finally diagnosed as having rapid progressive periodontitis in 63 cases and acute localized destruction of alveolar bone in 6 cases. 19 cases were not be diagnosed due to poor radiographs. The mean age of the JP group was 19.8 years, for the rapid progressive periodontitis group 23.0 years and for the acute destruction of alveolar bone 18.8 years. 75.3% of the JP group were black, 20.3% white and 4.4% others. The sub-classification of the JP patients based of the number of teeth involved revealed Class I in 70.9%, Class II in 23.6% and Class III in 5.5% of the cases. In 46.6% of the JP patients discernible radiographic calculus was detected.
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