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目的评价不同投照角度X线根尖片诊断下颌第一磨牙远中舌根的作用。方法选择需行根管治疗的205颗下颌第一磨牙为研究对象。术前拍X线正位根尖片及近中20°～30°偏位根尖片,对比分析是否存在远中舌根。术中根据根管的弯曲情况把远中舌根分为3类。记录下颌第一磨牙牙根和根管的数量。结果术前X线正位、近中偏位根尖片判断48颗(48/205)下颌第一磨牙存在远中舌根,临床治疗中均确定有远中舌根,其余157颗下颌第一磨牙术中均未见远中舌根。远中舌根发生率为23.41%。48颗下颌第一磨牙远中舌根中,Ⅰ类根管22颗(45.83%);Ⅱ类根管17颗(35.41%);Ⅲ类根管9颗(18.75%)。205颗下颌第一磨牙106颗(51.70%)为3根管;98颗(47.80%)为4根管;1颗(0.48%)为5根管。结论术前多角度根尖片能准确诊断下颌第一磨牙远中舌根。
Objective To evaluate the role of X-ray root tip radiofrequency in the diagnosis of mandibular first molar distal root tongue. Methods 205 mandibular first molars undergoing root canal therapy were selected as the research object. Preoperative X-ray radiographs and proximal apical 20 ° ~ 30 ° offset radiographs, comparative analysis of the presence of distal tongue base. According to the curvature of the root canal in the distal tongue is divided into three categories. Record the number of mandibular first molar root and root canal. Results There were 48 cases (48/205) of distal mandibular first molars preoperatively under the preoperative X-ray and near-median deflexion tips. There were 157 cases of distal maxillary first molar in clinical treatment No tongue in the middle of the tongue. The incidence of distal tongue was 23.41%. Forty-eight mandibular first molars had 22 (45.83%) type I root canals, 17 (35.41%) class II root canals, and 9 (18.75%) class III root canals. There were 106 tubes (51.70%) in 205 mandibular first molars, 4 tubes in 98 tubes (47.80%) and 5 tubes in 1 tube (0.48%). Conclusions Multi-angle apical preoperatively can accurately diagnose the middle tongue base of mandibular first molar.