【作者】 徐婷； 高现花； 范伟； 范兵；

【Author】 Ting Xu;Xianhua Gao;Wei Fan;Bing Fan;The State Key Laboratory Breeding Base of Basic Science of Stomatology(Hubei-Most) & Key Laboratory of Oral Biomedicine Ministry of Education,School & Hospital of Stomatology,Wuhan University;

【机构】 口腔基础医学省部共建国家重点实验室培育基地和口腔生物医学教育部重点实验室武汉大学口腔医院；

【摘要】 目的:根尖分叉是一种常见的根管系统形态变异,对于根管治疗具有重要的临床意义。本研究使用显微CT分析中国人恒牙中根尖分叉的发生率和形态特点。方法:收集1400颗中国人恒牙,上下共14个牙位,每个牙位100颗,使用显微CT进行分辨率为15微米的扫描。并记录根尖分叉的数目以及根尖分叉的垂直距离,通过中心线方法进一步测量根尖分叉的直径和角度。结果:在15颗前牙、27颗前磨牙以及46颗磨牙中共发现了92个根尖分叉。根尖分叉位于根尖的垂直距离为1.1mm(范围为0.3-3.5mm);98.9%的根尖分叉位于根尖3mm以内;根尖分叉与主根管之间形成的小角度为20.4°;根尖分叉与主根管之间形成的大角度为32.9°;根尖分叉的直径中位数为195.0μm。结论:中国人恒牙的根尖分叉发生率较高,且多发生于后牙。大部分根尖分叉位于根尖3mm以内,且直径大于200μm。更多还原

【Abstract】 Objective:Apical bifurcation,as a common variation in root canal morphology,has great clinical significance for root canal treatment.The aim of this study was to investigate the morphological characteristics of the apical bifurcated canal in Chinese teeth based on a large sample size using microCT.Methods:One thousand and four hundred Chinese permanent teeth were scanned by using micro-CT with the resolution of 15 μm.The number of apical bifurcations was calculated and the vertical distance of apical bifurcations was recorded.The diameter and angles of the apical bifurcated canals were further measured using the centerline algorithm method.Results:Ninety-two apical bifurcations were detected in 15 anterior teeth,27 premolars,and 46 molars.The median vertical distance of apical bifurcations was 1.1 mm from the apex(ranging from 0.3 to 3.5 mm).Ninety-eight-point nine percent of the apical bifurcations were located less than 3 mm from the apex.The smaller angle of apical bifurcated canals with the main canal was 20.4°.The larger angle of the apical bifurcated canals with the main canal was 32.9°.The median diameter of apical bifurcated canals was 195.0 μm.Conclusion:A high prevalence of apical bifurcation can be detected in the human permanent teeth,especially in posterior teeth.Most apical bifurcations locate within the apical 3 mm with a diameter more than 200 μm.更多还原