下颌尖牙多为一根管,仅约5％分唇舌二根管。下颌尖牙患龋率较少,故临床难发现双根管。笔者自1986年起发现下颌尖牙双根管13例,右侧8例,左侧5例。13例中仅1例因治疗中发现双根管得以保留,其余12例均因治疗时遗漏根管造成长期根尖周慢性炎症,失去治疗机会,最后拔除患牙。现将右下颌尖牙双根管1例治疗过程报告如下。 患者女,58岁,病历号219778。X线号80852,43牙一年前曾在他院治疗,一直不适。检查:43大面积缺损,有部分银汞充填体,继发龋,局部牙龈无红肿,Ⅰ°松动,不明显叩痛,舌侧巳开髓,探痛(-)。X线示:43尖周末见明显病变和双根管。诊断为43继发龋,牙髓坏死。43常规根管预备。发现根管较细,只能探入Ⅰ号扩 Mostly a mandibular canine, only about 5% points tongue two tubes. Lower canine canine caries rate is less, it is difficult to find a double root canal clinical. Since 1986, the author found 13 cases of mandibular canine double root canal, 8 cases on the right and 5 cases on the left. Only one of the 13 cases was found to have double root canal because of the treatment. The remaining 12 cases were caused by long-term periapical chronic inflammation due to omission of the root canal during treatment, losing the chance of treatment and finally removing the affected tooth. Now the right mandibular canine two cases of treatment report as follows. Female patient, 58 years old, medical record number 219778. X line number 80852,43 teeth treated in his hospital a year ago, has been unwell. Check: 43 large area defects, some amalgam filling body, secondary caries, local gums without swelling, Ⅰ ° loosening, no obvious percussion pain, the tongue has been opened pulp, pain (-). X-ray showed: 43 weeks saw obvious lesions and double root canal. 43 secondary caries diagnosed, pulp necrosis. 43 conventional root canal preparation. Found that the root canal thinner, can only explore into Ⅰ expansion