摘要
目的采用显微CT精确测量下颌第一前磨牙根管的弯曲度,为临床根管治疗提供依据。方法收集华东地区汉族人154颗离体下颌第一前磨牙并进行显微CT扫描,采用Mimics 10.01(Materialise,Leuven,比利时)对牙齿及根管系统进行三维重建,在平行投照模式下,采集根管系统颊面观及邻面观的影像并测量根管的弯曲度。结果下颌第一前磨牙单根管在颊面观上初次弯曲的平均角度仅为11.1°(Schneider法),二次弯曲出现率较低,在颊面观出现6例,邻面观出现4例。下颌第一磨牙双根管时,重度弯曲(>20°)主要位于邻面观,颊、舌根管初次弯曲的平均角度分别为17.5°和28.7°,二次弯曲的发生率分别为19.1%(9/47)和85.1%(40/47)。舌侧副根管的弯曲半径和圆心角均值分别为6.6 mm和54.2°;舌侧根管的根管口离根尖的平均距离为6.6 mm。结论下颌第一前磨牙舌侧根管多出现在根中及根尖1/3,在邻面观常有重度弯曲。
Objective To accurately measure the root canal curvatures in the mandibular first premolars by using micro-CT scans.Methods A total of 154 extracted mandibular first premolars were collected from a Han-Chinese population in East China and were scanned by a micro-CT scanner.The specimens and root canal systems were reconstructed three-dimensionally by software Mimics 10.01(Schneider method).The canal curvatures were analyzed in the clinical(CV)and proximal views(PV).Results The average angle of first root canal curvatures in the first mandibular premolar was only 11.1°in the buccal view(Schneider method).The incidence of secondary root canal curvatures was low.There were 6 cases in the buccal view and 4 cases in the adjacent view.In the first mandibular premolars with double canals,severe curvature(>20°)was mostly detected in the PV.The mean degrees of the primary angle of the buccal and lingual canals were 17.5 and 28.7 degrees,respectively;and the occurrence rate of the secondary curvature was 19.1%(9/47)and 85.1%(40/47),respectively.The mean radii and center angle of the accessory lingual canals were 6.4 mm and 54.2°,respectively,and the orifice of the accessory canal was located at a mean level of 6.6 mm from the apex.Conclusion The lingual root canal in the mandibular first premolars was mostly located at the middle or apical third of the root with severe curvature in the adjacent view.
作者
刘芳
顾永春
Liu Fang;GU Yongchun(Department of Stomatology,First People’s Hospital of Urumq,Urumq 830000;Department of Stomatology,First People’s Hospital of Wujiang District,Suzhou 215200)
出处
《口腔材料器械杂志》
2018年第3期138-143,共6页
Chinese Journal of Dental Materials and Devices
关键词
下颌第一前磨牙
舌侧副根管
根管弯曲度
显微CT
Mandibular first premolar
Lingual accessory canal
Root canal curvature
Micro-CT
