自1992年以来,我们对后磨牙冠严重缺损者,在已做根管治疗的基础上,分别采用冠钉固位,以银汞合金、复合树脂和光固化复合树脂三种方法进行修复治疗,对恢复患牙的外形和功能,收到较好效果,现报告如下: 1 临床资料 1.1 一般情况 本组为年龄12～62岁,后磨牙冠严重缺损1/2以上;牙周组织健康,无龈炎或牙周 Since 1992, we have a serious defect of the post-molar on the basis of root canal therapy have been done, respectively, with crown nailing, silver amalgam, composite resin and light-cured composite resin three methods of repair and treatment, The recovery of the shape and function of the affected teeth, received good results, are reported as follows: 1 Clinical data 1.1 General This group is aged 12 to 62 years old, severe damage to the molar after the crown more than 1/2; periodontal tissue health, Inflammation or periodontal