近年来,对后磨牙牙冠缺损超过1/2的治疗报道很多,而后磨牙邻(牙合)胎龋缺损不超过1/2的牙髓治疗,一直延用鸠尾洞型,揭髓顶根管治疗充填,临床研究证明,由于髓腔预备,使牙体组织缺失,牙髓治疗后,牙本质同脆性增加,易导致牙齿劈裂,因此我科从1995年开始,对后磨牙邻(牙合)缺损不超1/2牙齿行开窗式去髓顶,根管治疗加牙本质钉或选用根钉固位,取得良好效现报告如下。 In recent years, the treatment of post-molar crown more than 1/2 of the treatment reported a lot, and then molars (occlusal) caries defect less than 1/2 dental pulp treatment, has been extended with dovetail-hole type, Tube filling treatment, clinical studies have shown that due to the preparation of the pulp cavity, so that the loss of tooth tissue, dental pulp treatment, dentin with increased brittleness, easily lead to tooth splitting, so our department from 1995 on the post molar molars (teeth ) Defect not more than 1/2 Teeth to open the window to the demyelination, root canal treatment plus dentin nail or use the root retention, and achieved good results are as follows.