利用锥形束CT分析上颌第一磨牙根尖片的最佳拍摄角度

发布时间：2018-03-05 20:37

本文选题：根尖片　切入点：分角线投照　出处：《华中科技大学学报(医学版)》2015年05期 　论文类型：期刊论文

【摘要】：目的探讨分角线法拍摄上颌第一磨牙根尖片的适宜角度。方法选取198例患者锥形束CT(CBCT)资料,测量左、右两侧上颌第一磨牙近中舌尖之间距离、腭顶至上颌牙合平面高度、双侧上颌前磨牙和磨牙连线与左右第一磨牙连线所成角度(记其余角为角1)。记颧骨或颧弓最下缘为点a,腭顶为点b,腭根根尖为点c。分别测量点a、b连线与水平面所成夹角(角2)、点a、c连线与水平面所成夹角(角3)以及点b、c连线与水平面所成夹角(角4)。结果左、右两侧上颌第一磨牙近中舌尖之间距离均值为(40.48±2.05)mm;腭顶至上颌牙合平面高度均值为(20.28±2.12)mm;角1、2、3、4的均值分别为(15.83±4.95)°、(11.75±3.71)°、(21.66±6.22)°和(-2.62±7.17)°。各测量指标均值在男女性别分组及年龄分组中差异均无统计学意义。结论拍摄上颌第一磨牙根尖片时,X线管的最适宜水平角度是16°左右;最适宜垂直角度范围是-3°~22°左右,理论最佳投照角度为22.5°,与国内口腔放射影像学教科书中推荐值(30°)有偏差。
[Abstract]:Objective to study the suitable angle of angle line method for shooting maxillary first molar apical radiography. Methods 198 patients were selected to measure the distance between left and right first maxillary first molar proximal and middle tongue tip and the height from the palate top to the maxillary occlusal plane. Angle between bilateral maxillary premolars and molars and left and right first molars (1 angle for the rest, point a for zygomatic or zygomatic arch, point b for top of palate, point c for root tip of palatine). The angle between point A c and horizontal plane (angle 3), and the angle between point b c line and horizontal plane (angle 4 n). The mean distance between the right first molar and the middle tongue was 40.48 卤2.05 mm, the mean height from the top of the palate to the maxillary occlusal plane was 20.28 卤2.12 mm, the mean value of the angle was 15.83 卤4.95 掳, 11.75 卤3.71 掳and -2.62 卤7.17 掳, respectively. Conclusion the optimum horizontal angle of X ray tube is about 16 掳when the maxillary first molar is taken. The optimum vertical angle range is about 3 掳~ 22 掳, and the theoretical optimum angle is 22.5 掳, which is different from the recommended value of 30 掳in domestic oral radiography textbooks.
【作者单位】：华中科技大学同济医学院附属同济医院口腔医学中心;
【分类号】：R816.98

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