13～23岁下颌第二前磨牙单根管锥度的初步研究
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潘莉，章润贞，李颂 、岁下颌第二前磨牙单根管锥度的初步研究、[J].华西口腔医学杂志,2010,7(2):
显微CT； 下颌第二前磨牙； 根管； 锥度
潘莉 章润贞 李颂
安徽医科大学附属口腔医院 牙体牙髓科，安徽 合肥 230032
2010
知网
目的 探讨青少年下颌第二前磨牙单根管的初始锥度。方法 收集牙体完整的13～23岁单根管离体下颌第二前磨牙23颗，采用显微CT对标本从根尖向冠方进行断层扫描，将每个根管平均分为3段，通过3ddoctor软件测量根管的近远中向管径及颊舌向管径，计算这3个水平段颊舌向和近远中向根管锥度。结果 根管近远中向锥度由根冠至根尖分别为0.06、0.08、0.07，颊舌向锥度由根冠至根尖分别为0.32、0.21、0.25。颊舌向3段锥度之间的差异均有统计学意义（P0.05）。结论 13～23岁单根管下颌第二前磨牙根管颊舌向锥度变化明显，最小的锥度在根中1/3。近远中向锥度较颊舌向小，但根管上下差别不大。 Objective To determine the root canal initial taper of mandibular second premolars of 13-23 year-old people by using Micro-CT. Methods 23 extracted, single root, human root canal of mandibular second premolars of 13-23 year-old people were selected. The teeth were embedded in resin. The resins were scanned using Micro-CT at a resolution of 10 μm. The photographs at each level of 1 mm perpendicular to the long axis of the tooth were chosen. Bucco-lingual（BL） and mesio-distal（MD） diameters of each canal were measured at cervical, middle and apical third of the canals. Finally the taper were calculated and analyzed. Results The average taper of cervical, middle, and apical third of adolescents′ root canals were 0.06, 0.08, 0.07（mesio-distal direction） and 0.32, 0.21, 0.25 （bucco-lingual direction）. The difference was not observed among three level on mesio-distal direction about the canal taper by t-test（P>0.05）, but there was difference among three level on bucco-lingual direction about the canal taper by t-test（P
