拔除后牙,尤其是下颌阻生第三磨牙和多根死髓牙,常发生断根。因根尖细小、弯曲、深在,掏取时常感到困难,有时创伤较大,手术时间延长,术后反应加重,易发生感染等并发症。为了观察断根遗留的临床变化情况,我们从1970年以来,对遗留断根进行了观察。现将资料完整的125例(140个断根)的复查结果 Removal of posterior teeth, especially the third impacted mandibular molar and multiple dead teeth, often occurs in the root. Because the root tip is small, curved, deep, dig out often feel difficult, and sometimes trauma, surgery, prolonged surgery, postoperative reactions, prone to complications such as infection. In order to observe the clinical changes left over from the roots, we have observed the left roots since 1970. The information now complete 125 cases (140 root) review results