摘要
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(P<0.05),而近远中向3段锥度之间的差异无统计学意义(P>0.05)。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-tes（tP0.05）, but there was difference among three level on bucco-lingual direction about the canal taper by t-tes（tP0.05）. Conclusion The change of bucco-lingual taper of mandibular second premolar of 13-23 year-old people is obvious, and the smallest taper is in middle third of the canal. The mesio-distal taper of the canals is smaller than the bucco-lingual taper and the change of mesio-distal taper isn＇t obvious.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2010年第2期162-165,169,共5页
West China Journal of Stomatology
关键词
显微CT
下颌第二前磨牙
根管
锥度
Micro-CT
mandibular second premolar
root canal
taper
