下颌第一乳磨牙近中根管分析

The orifice location of mesial root canals in mandibular first decidous molars

目的：研究下颌第一乳磨牙近中根管的分布并探寻近中舌侧根管的发现几率及解剖标记。方法：选取4-7岁因各类疾病须行CBCT检查,同时下颌第一乳磨牙须行根管治疗的患儿52人共69个患牙,探寻近中根管口位置并记录根管数目,于髓室底水平测量近中根管口间距离,测量两根管延长线的交角。所得数据进行统计学分析。结果：所有近中根管样本中单根管口出现率为24.64%（17个）、双根管口为75.36%（52个）。其中双根管口之间有峡区43例（62.32%）、无峡区9例（13.04%）。结论：下颌第一乳磨牙近中双根管存在几率较高,近中双根管时存在独立根管口和融合根管口。

AIM： To observe the orifice location of mesial root canals in mandibular first decidous molars and to find out the probability of mesillingual root canals and their anatomical markers by CBCT. METHODS：69 mandibular first deciduous molars in 52 children aged 4- 6 years underwent CBCT examination and root canal therapy of the molars were included. The number and orifice location of mesial root canals were observed and recorded. The distance between 2 orifices of mesial root canals were measured horizontally at the bottom of the lumen and the intersection angle of the canals were measured. The data was statistically analyzed. RESULTS： The occurrence rate of single canal orifice was 24. 64%（ 17 roots）,and that of double canal orifice was 75. 36%（ 52 roots）. Among the double canal orifices,43 cases（ 62. 32%） were found with stenosis and 9 cases（ 13. 04%） with no stenosis. CONCLUSION：The occurrence of mesiallingual root canals in mandibular first deciduous molars is high. The orifices of the double canal can be individual or fused.