Kohinata Kiyomi, Esaki Yuka, Iida Yukihiro, Satomi Chieko, Arai Yoshinori, Katsumata Akitoshi
Department of Oral Radiology, School of Dentistry, Asahi University, 1851 Hozumi, Mizuho-Shi, Gifu, 501-0296, Japan.
Asahi University Medical and Dental Center, 1851 Hozumi, Mizuho-Shi, Gifu, 501-0296, Japan.
Oral Radiol. 2025 Apr;41(2):216-221. doi: 10.1007/s11282-024-00795-x. Epub 2024 Dec 16.
The horizontal tube-shifting technique can be adopted to separate overlapping buccal roots of the maxillary molar from the palatal root. A simulation study was performed to determine an appropriate tube-shift angulation when adopting three-dimensional computed tomography imaging.
Cone-beam computed tomography images of 21 volunteers were used for simulation. Adopting image analysis software, maximum intensity projection (MIP) three-dimensional images of maxillary molars observed from directions similar to the direction of an intraoral radiography X-ray beam were reconstructed. The orthoradial projection angle was taken as the baseline and the tube-shifting technique was then simulated to separate superimposed buccal roots from the palatal root.
The tube-shift technique was considered applicable to maxillary molars for 29/42 teeth (69%) in the case of a mesial tube shift and 40/42 teeth (95.2%) in the case of a distal tube shift. The specific shifting angle suitable for observing the buccal root apex of the maxillary molar without overlapping was obtained.
可采用水平管移位技术将上颌磨牙重叠的颊根与腭根分开。进行了一项模拟研究，以确定采用三维计算机断层扫描成像时合适的管移位角度。
使用21名志愿者的锥形束计算机断层扫描图像进行模拟。采用图像分析软件，从类似于口腔内X线摄影X线束方向的角度观察上颌磨牙，重建最大强度投影（MIP）三维图像。以正位投影角度为基线，然后模拟管移位技术将叠加的颊根与腭根分开。
对于近中管移位，管移位技术适用于42颗牙齿中的29颗（69%）上颌磨牙；对于远中管移位，适用于42颗牙齿中的40颗（95.2%）。获得了适合观察上颌磨牙颊根尖而无重叠的具体移位角度。
