Comparison of three midsagittal planes for three-dimensional cone beam computed tomography head reorientation
Comparison of three midsagittal planes for three-dimensional cone beam computed tomography head reorientation
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DOI：
10.4041/kjod.2020.50.1.3
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发表时间：
2020-01-01
影响因子：
1.9
通讯作者：
Hwang, Chung-Ju
中科院分区：
文献类型：
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作者：
Lee, Eon-Hwa;Yu, Hyung-Seog;Hwang, Chung-Ju
目的：本研究比较了三个突出正中矢状面（MSP），以确定最接近真正对称MSP的MSP。研究方法：43名患者（平均年龄23.0 ± 8.20岁）分为两组：第1组10例，骨性I类，门顿（Me）偏斜< 2 mm，第2组11例，骨性111类，Me偏斜< 2 mm;第3组，9名患者，骨骼分类111，Me偏差为2至小于4 mm;以及第4组，13例骨骼III类和Me偏差>= 4 mm的患者。通过三维（3D）锥形束计算机断层扫描（CBCT）确定候选MSP重新定位方法（RM）：（1）MSP垂直于法兰克福水平面（FH），同时通过鸡冠和基底;（2）MSP包括鼻根、切牙孔和基底;（3）MSP包括鼻根、前鼻棘和后鼻棘。根据129张CBCT图像上1，548个点的坐标计算到MSP的平均绝对距离（MAD）。比较了RM之间3D坐标值的差异。结果：三种RM的MAD值差异有统计学意义（p < 0.05）。RM之间坐标值的大多数差异不显著。结论：虽然三种MSP之间的距离差异很小，但垂直于FH平面同时穿过鸡冠和基底的MSP最接近真正的对称MSP。
Objective: This study compared three prominent midsagittal planes (MSPs) to identify the MSP that best approximates the true symmetrical MSP. Methods: Forty-three patients (mean age, 23.0 +/- 8.20 years) were grouped as follows: group 1 consisted of 10 patients with skeletal Class I and a menton (Me) deviation of < 2 mm; group 2, 11 patients with skeletal Class 111 and a Me deviation < 2 mm; group 3, nine patients with skeletal Class 111 and a Me deviation of 2 to less than 4 mm; and group 4, 13 patients with skeletal Class III and an Me deviation >= 4 mm. The candidate MSPs were established by three-dimensional (3D) cone beam computed tomography (CBCT) reorientation methods (RMs): (1) the MSP perpendicular to the Frankfort horizontal (FH) plane while passing through the crista galli and basion; (2) the MSP including the nasion, incisive foramen, and basion; (3) the MSP including the nasion, anterior nasal spine, and posterior nasal spine. The mean absolute distances (MADs) to the MSPs were calculated from the coordinates of 1,548 points on 129 CBCT images. The differences in the values of the 3D coordinates among RMs were compared. Results: The MADs of the three RMs showed significant differences (p < 0.05). Most of the differences in values of the coordinates were not significant among RMs. Conclusions: Although the differences in distance among the three MSPs were minor, the MSP perpendicular to the FH plane while passing through the crista galli and basion best approximated the true symmetrical MSP.