Fuessinger Marc Anton, Russe Maximilian Frederik, Brandenburg Leonard Simon, Metzger Marc Christian, Schulze Johannes, Schlager Stefan, Wuester Jonas, Semper-Hogg Wiebke
Department of Oral and Maxillofacial Surgery, Albert Ludwig University Freiburg, Hugstetterstr. 55, D-79106, Freiburg, Germany.
Department of Radiology, Albert Ludwig University Freiburg, Hugstetterstr. 55, D-79106, Freiburg, Germany.
Head Face Med. 2025 Jun 7;21(1):45. doi: 10.1186/s13005-025-00518-5.
Cone beam computed tomography (CBCT) is an established diagnostic tool for impacted wisdom teeth (third molars (3 M)) in proximity of the mandibular nerve canal. This study aims to define the minimum field-of-view (FOV) size and its localization to reduce radiation exposure. As reference, the chin rest of the CBCT device was used.
Three-dimensional CBCT data sets were used to analyze the bilateral positions and dimensions of the wisdom teeth. A total of 215 wisdom teeth from a study population with a mean age of 21 years, including data from 82 male and 58 female patients, were mapped. By transformation into a common coordinate space using the device's chin rest as a joint denominator, the optimal size and location for uni- and bilateral capture of the wisdom teeth were determined, for both best-case and worst-case scenarios with regard to patient positioning.
The minimal FOVs for the lower 3 M capture were H 23.5 mm × R 35.4 mm in the best-case scenario assuming optimal patient positioning and H 35.4 mm × R 36.6 mm in the worst-case scenario with rotational deviation along the transversal axis. For the upper 3 M, the minimal FOVs were H 29.9 mm × R 29.2 mm in the best-case scenario and H 38.6 mm × R 35.6 mm in the worst-case scenario. Unilateral capture of both the upper and lower 3 M required FOV dimensions of H 51.7 mm × R 39.8 mm and H 44.8 mm × R 36.8 mm, respectively. For bilateral capture of all four 3 M, the best-case FOV was H 44.8 mm × R 84.8 mm and the worst-case FOV was H 51.7 mm × R 85.6 mm.
This research provides indication-specific FOVs for uni- and bilateral imaging of the upper and lower 3 M. Taking into account optimal clinical practices for CBCT imaging, this study aims to propose clinically feasible FOV dimensions while meeting the technical specifications of commonly used CBCT devices. Clinical application of the results may help reduce radiation exposure of patients receiving CBCT imaging of the wisdom teeth. Transfer of the present results to other CBCT devices requires further research.
The study is registered in the German Trial Register with the number DRKS00026149, 2024/02/21.
锥形束计算机断层扫描（CBCT）是用于诊断下颌神经管附近阻生智齿（第三磨牙（3M））的既定诊断工具。本研究旨在确定最小视野（FOV）大小及其定位，以减少辐射暴露。以CBCT设备的颏托作为参考。
使用三维CBCT数据集分析智齿的双侧位置和尺寸。对来自平均年龄为21岁的研究人群的总共215颗智齿进行了测绘，其中包括82名男性和58名女性患者的数据。通过以设备的颏托作为共同分母转换到共同坐标空间，确定了在患者定位的最佳情况和最坏情况下，单侧和双侧捕获智齿的最佳尺寸和位置。
在假设患者定位最佳的最佳情况下，下颌3M捕获的最小视野为H 23.5mm×R 35.4mm；在沿横轴存在旋转偏差的最坏情况下，最小视野为H 35.4mm×R 36.6mm。对于上颌3M，最佳情况下的最小视野为H 29.9mm×R 29.2mm，最坏情况下为H 38.6mm×R 35.6mm。单侧捕获上颌和下颌3M分别需要的视野尺寸为H 51.7mm×R 39.8mm和H 44.8mm×R 36.8mm。对于双侧捕获所有四颗3M，最佳情况下的视野为H 44.8mm×R
