广东青少年上颌第一前磨牙根管弯曲情况的研究
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[摘要] 目的 探讨广东青少年上颌第一前磨牙的根管弯曲情况，并对比分析男女间的差异。方法 选择广东青少年上颌第一前磨牙200颗，其中男女各100颗。开髓并充分暴露根管口后，将一支K型锉插入根管内直至根尖孔处。利用牙科数字成像系统拍摄每颗牙的近远中向及颊舌向影像，采用Schneider法测量根管弯曲角度（CCA），然后选择
弯曲角度大于5°的根管，采用Günday法测量根管进入角度（CAA）、弯曲高度（X）和弯曲距离（Y），分析男女两组之间的差异及CAA与CCA、X和Y的相互关系。结果 59.21%的根管存在颊舌向弯曲，男女分别为49.74%、68.98%；41.05%
的根管存在近远中向弯曲，男女分别为36.27%、45.99%；6.84%的根管为S形弯曲，男女分别为4.15%、9.63%。单根管在颊舌向、腭根管在颊舌向和近远中向的弯曲率均为女性高于男性（P＜0.05）。颊根管在颊舌向和近远中向Y值和腭根管颊舌向CCA均为女性大于男性（P＜0.05）；男女弯曲颊、腭根管的CAA与CCA及X呈显著正相关（P＜0.01），与Y呈显著负相关（P＜0.05）。结论 上颌第一前磨牙根管存在颊舌向和近远中向弯曲，其中一些为S形根管。女性根管弯
曲率高于男性。
[关键词] 性别； 根管弯曲角度； 根管进入角度； 弯曲高度； 弯曲距离
[中图分类号] R 322.4+1 [文献标志码] A [doi] 10.3969/j.issn.1000-1182.2012.03.016
In vitro study on the curvatures of root canal of maxillary first premolars among adolescents in Guangdong province Zeng Sujuan1, Hu Yan2, Wang Xiaoyan1, Cai Xiaoling1, Wang Liping1. （1. Dept. of Oral Medicine, Hospital of Stomatology, Guangzhou Medical University, Guangzhou 510140, China; 2. Dept. of Special Dental Clinic, Hospital of Stomatology, Sun Yat-Sen University, Guangzhou 510055, China）
[Abstract] Objective To study the root canal curvatures of adolescents’ maxillary first premolars in Guangdong province and the differences between male and female were studied. Methods 200 maxillary first premolars among adolescents in Guangdong Province（100 males and 100 females） were numbered in proper. After access preparation, a
K-file was inserted into the canal until the tip of the file was just seen at the apical foramen. Then standardized periapical images were taken from mesial-distal and buccal-lingual directions with radio visio graphy. The angle of canal curvature（CCA） was determined according to the method described by Schneider. Then the curved canals whose
angle were more than 5° were chosen, and the canal access angle（CAA）, curvature height（X） and curvature dis-
tance（Y） were determined according to the method described by Günday. Linear correlations of the measurements
were analyzed. Results 59.21% of the total roots were curved in buccal-lingual directions. The incidence rates of males’ and females’ were 49.74% and 68.98%, respectively. 41.05% of the total roots were curved in mesial-distal directions. The incidence rates of males’ and females’ were 36.27% and 45.99%, respectively. 6.84% of the total roots were S-shaped curves. 4.15% and 9.63% of canals from male and female were S-shaped curves, respectively. The curvatures of single root canals between male and female had statistical differences in buccal-lingual directions（P＜0.05）. The curvatures of the lingual root canals from females in buccal-lingual directions and mesial-distal direc-tions was higher than males’（P＜0.05）. The Y of buccal root canals in buccal-lingual directions and mesial-distal directions and the CCA of lingual root canals in buccal-lingual directions between male and female had statistical differences（P＜0.05）. The CAA of curved buccal canals and curved palatal canals from female and female had positive