Resident, Division of Orthodontics, University of Connecticut Health, Farmington, Connecticut.
Research Instructor, Division of Orthodontics, University of Connecticut Health, Farmington, Connecticut.
J World Fed Orthod. 2020 Dec;9(4):146-154. doi: 10.1016/j.ejwf.2020.09.006. Epub 2020 Nov 6.
The objective of this study was to evaluate the effects of single plane and multiplane rotational errors in yaw, pitch, and roll of the head while recording the lateral cephalogram on CVM (cervical vertebrae maturity) assessment.
A total of 40 cone-beam computed tomography (CBCT) scans and 360 lateral cephalograms were analyzed for patients with different rotations: Controls (no rotation), Y5 (yaw 5° rotation), Y10 (yaw 10° rotation), R5 (roll 5° rotation), R10 (Roll 10° rotation), P5 (pitch 5° rotation), P10 (pitch 10° rotation), YRP5 (yaw, roll, and pitch 5° rotation), and YRP10 (yaw, roll, and pitch 10° rotation). The C2, C3, and C4 concavity and their base-anterior ratio and posterior-anterior ratio were measured. In addition, maxillomandibular linear parameters, such as effective mandibular length and height, mandibular body length, effective midface length, and maxillomandibular differential, were also evaluated.
Y5, Y10, R5, and R10 led to overestimation of CVM in comparison with controls. Multiplane rotations (YRP5 and YRP10) led to more inaccuracies in CVM measurements than single plane rotations; 10° of rotation led to more inaccuracies than 5° of rotation while recording the lateral cephalogram, irrespective of the plane. Yaw rotational errors led to an underestimation of maxillomandibular linear measurements, whereas roll rotational errors led to an overestimation of the measurements; however, there were wide individual variations in the measurements between the different rotations and controls.
Rotational errors lead to overestimation of CVM assessment. Multiplane rotations cause higher inaccuracies than single plane rotations. Increased degree of rotations while capturing the lateral cephalograms lead to more inaccuracies in CVM assessment.
本研究旨在评估头部在矢状面、冠状面和水平面旋转时，单平面对和多平面旋转对颈椎成熟度（CVM）评估中侧位头颅定位片的影响。
共分析了 40 例锥形束 CT（CBCT）扫描和 360 例侧位头颅定位片，这些患者的旋转角度分别为：对照组（无旋转）、Y5 组（5°矢状面旋转）、Y10 组（10°矢状面旋转）、R5 组（5°水平面旋转）、R10 组（10°水平面旋转）、P5 组（5°冠状面旋转）、P10 组（10°冠状面旋转）、YRP5 组（5°矢状面、冠状面和水平面旋转）和 YRP10 组（10°矢状面、冠状面和水平面旋转）。测量 C2、C3 和 C4 的凹陷程度及其基底-前缘比和后-前缘比。此外，还评估了下颌骨和上颌骨的线性参数，如有效下颌长度和高度、下颌体长度、中面部有效长度和上下颌骨差异。
与对照组相比，Y5、Y10、R5 和 R10 导致 CVM 高估。多平面旋转（YRP5 和 YRP10）比单平面旋转导致 CVM 测量更不准确；在记录侧位头颅定位片时，10°的旋转比 5°的旋转导致更大的误差，而与平面无关。矢状面旋转误差导致下颌骨和上颌骨线性测量值低估，而水平面旋转误差导致测量值高估；然而，在不同旋转和对照组之间，测量值存在广泛的个体差异。
旋转误差导致 CVM 评估高估。多平面旋转比单平面旋转导致更高的不准确性。在捕获侧位头颅定位片时，旋转角度增加会导致 CVM 评估更不准确。
