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我科1976～1984年对44例9～13岁拔除六龄牙患者进行了临床观察,共拔牙50个,上颌8个下颌42个。年龄分组:9岁6个,10岁10个,11岁17个,12岁6个,13岁11个。观察时间,最短的1年,最长的13年。现将结果报道如下: 方法:拔牙前摄X牙片观察第二及第三磨牙牙胚情况,取记存模型留作复查时对照用。一年后复查,复查时再制石膏模型观察(牙合)关系的变化。统计时以拔牙个数为单位。
From 1976 to 1984, 44 cases of 6-year-old patients with teeth removed from 9 to 13 years old were enrolled in our department. There were 50 teeth in total and 42 in 8 maxillas. Age groups: 6 at 9, 10 at 10, 17 at 11, 6 at 12, and 11 at 13. Observation time, the shortest 1 year, the longest 13 years. The results are reported as follows: Methods: pre-extraction tooth X-tooth observation of the second and third molars tooth germs, take the memory model for review when the control. One year after the review, re-made gypsum model observed (occlusal) changes. Statistics to pull the number of teeth as a unit.