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对在1974年11月到1977年11月施行死髓或活髓切断术的乳磨牙184例进行复查。计女性100例,男性84例,年龄为3—11岁,牙别为DD60例,EE46例,DD38例和EE40例。凡具有下列表现之一者即作为治疗失败:①疼痛、龈脓肿、龈瘘,②牙根内吸收或根间骨破坏,③非正畸拔牙史。将成功数加已知脱落原因数之和除以牙齿总数减去未知原因缺牙数之差以计算成功率。因为未知
184 cases of deciduous molars undergoing either a dead or vital pulpotomy between November 1974 and November 1977 were reviewed. 100 females, 84 males, aged 3-11 years old, DD60 cases of teeth do not, EE46 cases, DD38 cases and EE40 cases. Those who have one of the following performance failure as a treatment: ① pain, gingival abscess, gingival fistula, ② root resorption or root destruction, ③ non-orthodontic tooth extraction history. The success factor plus the known causes of shedding divided by the total number of teeth minus the number of unknown causes of missing teeth to calculate the success rate. Because unknown