パノラマエックス線写真の分析 : 埋伏歯及び歯の欠損の把握

概要

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We analyzed the incidence of dental impaction and defects, using panoramic radiographs. Panoramic radiographs were obtained from students during radiological training at our college between 1977 and 1982 (Group A) and between 1987 and 1992 (Group B). Dental defects were observed in 650 students in Group A (G.A) and 497 in Group B (G.B); the percentage of students with dental defects was greater in G.B. The incidence of dental defects was 7.9% in G.A and 7.4% in G.B. G.B showed a slightly higher percentage of defective teeth in both maxilla and mandible. According to tooth type, the incidence was most markedly decreased in the first molar, although the indidence was increased in the first premolar, which was opposite to the general trend. The third molar most frequently showed defects in both G.A (62.0%) and G.B (69.2%) but there was also an increase in theprevalence of such teeth. Tooth impaction was observed in 650 students in G.A and 349 in G.B; the percentage of students with tooth impaction was lower in G.B. The incidence of tooth impaction was 3.2% in G.A and 3.9% in G.B. G.B showed a slightly higher at each position were impaction was observed. According to tooth type, the third molar showed impaction most frequently. The state of impaction in the third molar was examined in detail. The number of the impacted third molars was 1.02 in G.A and 1.23 in G.B, the rate beins slightly higher in G.B.
福岡歯科大学学会の論文
1996-06-30