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外伤所致前牙冠折时有发生,以往多取桩冠修复,但必定丧失原冠,尤其是断向至龈下,桩冠修复有困难时,势必要拔牙后以义齿修复。上述方法均有费时长,工序繁,就诊次数多的缺点,而且牙冠颜色、形态、质地及功能均不及原冠。笔者采用根管治疗后即刻原冠修复治疗前牙冠折21例(含26颗牙),经观察效果满意,现报道如下。一般资料笔者在1983～1984两年中共接诊前牙冠折病人21倒,其中男11人,女10人;年龄13～63岁。就诊时间除1例在牙折后20天外,余均为1～2天,最短2小时。牙位为20颗;4颗;1颗;1颗,共26颗。冠折均为近颈部1/3横折或斜折,唇侧冠折线均在龈上,有6颗腭侧至龈缘;另20颗至龈下,其中18颗位于龈下3mm以内,余2颗
Traumatic injury caused by the occurrence of the former crown, crown in the past to take more crown repair, but must lose the original crown, especially to the subgingival rupture, crown repair difficulties, it is necessary to denture to denture repair. The above methods have the disadvantages of long time-consuming, complicated procedures and many visits, and the crown color, shape, texture and function are inferior to those of the original crown. The author used the root canal treatment immediately after the original crown restoration of the original 21 cases of crown fractures (including 26 teeth), the results were satisfactory, are reported below. General information The author in 1983 ~ 1984 two years before the admissions of patients with dental crown collapse 21 down, of which 11 were males and 10 females; aged 13 to 63 years. Except for one case, the time for visiting was 20 days after tooth fracture, while the remaining 1 to 2 days and the shortest 2 hours. Tooth for 20; 4; 1; 1, a total of 26. Coronal fractures were nearly 1/3 of the neck transverse or oblique fold, the lip crest fold line in the gingival, there are 6 palatal gingival margin; the other 20 to the subgingival, of which 18 are located within subgingival 3mm, More than 2