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无颌关节症状高、中、小学生为研究对象。9岁514人(男249人,女265人),12岁575人(男317人,女258人),15岁312人(男135人,女177人)。连续3年追踪调查。于头部放松状态下,采用游标尺多次测定上下切牙间和左右两侧最大开口距离,取其平均值。同时行身高测定。结果:男女各年龄组最大开口阈(mm):9岁分别为48.4和46.4,10岁为49.5和46.4,11岁为50.6和48.1,12岁为51.5和48.8,13岁为52.0和47.4,14岁为53.6和48.8,15岁为53.4和47.6,16岁为53.0和47.1,17岁为55.2和47.9。男女各年龄
No jaw joint symptoms of high school, primary and secondary school students for the study. 514 people aged 9 years (249 males and 265 females), 575 years old (317 males and 258 females) aged 12 years old and 312 people aged 15 years (135 males and 177 females). Track 3 consecutive years of investigation. Relaxed in the head state, the use of vernier scale determined several times between the upper and lower incisors and left and right sides of the maximum opening distance, whichever is the average. Simultaneous height measurement. Results: The maximum thresholds of men and women in each age group (mm) were 48.4 and 46.4 at 9 years, 49.5 and 46.4 at 10 years, 50.6 and 48.1 years at 11 years, 51.5 and 48.8 at 12 years, 52.0 and 47.4 at 13 years 53.6 and 48.8 years old, 53.4 and 47.6 at the age of 15, and 53.0 and 47.1 at the age of 16 and 55.2 and 47.9 at the age of 17 years. Men and women of all ages