Ardalani Rojin, Torkzadeh Azadeh, Ghaffari Roshanak, Saeedi Borujeni Mohammad Javad
Department of Oral and Maxillofacial Radiology, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
Department of Basic Dentistry Sciences, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
BMC Oral Health. 2025 Apr 18;25(1):584. doi: 10.1186/s12903-025-05954-y.
Cone Beam Computed Tomography (CBCT) is a widely used diagnostic tool for bone assessment. However, the impact of head orientation on linear bone measurements remains debated. This study aimed to evaluate whether the occlusal plane or the mandibular plane orientation provides more accurate measurements of mandibular height and width compared to a standard reference.
Five dry human mandibles were imaged at the Faculty of Dentistry, Islamic Azad University, Khorasgan, in 2024. CBCT scans were obtained using a NewTom VGi evo device. The scans were exported as DICOM and analyzed in ONDEMAND software. Measurements were taken in two head orientations: (1) occlusal plane parallel to the horizon and (2) mandibular plane parallel to the horizon. Mandibular height was measured from the alveolar crest to the inferior border at the incisor, canine, premolar, and molar sites. Bone width was measured from the buccal to the lingual cortical plate at the same sites. The measurement locations were pre-marked with gutta-percha to ensure consistency. The CBCT-derived measurements were then compared to caliper measurements.
Results indicated that measurements with the occlusal plane aligned to the horizon were generally closer to standard values compared to those with the mandibular plane aligned to the horizon. Statistically significant differences were observed in bone height at the canine site: mandibular plane (26.50 mm) vs. occlusal plane (26.99 mm) (p = 0.004), and both planes showed significant differences compared to the caliper measurement (27.78 mm) (p = 0.005 for mandibular plane, p = 0.018 for occlusal plane). At the premolar site, significant differences observed between the caliper measurement (28.57 mm) and both planes (mandibular plane: 27.36 mm, p < 0.001; occlusal plane: 27.62 mm, p = 0.01). In bone width at the canine site, both planes showed significant differences (p = 0.047). No significant differences were found at the molar site.
This study suggests that aligning the occlusal plane to the horizon results in more accurate CBCT-derived linear measurements of mandibular height and width compared to the mandibular plane orientation. Therefore, the occlusal plane may be the preferred reference for CBCT-based bone measurements.
锥形束计算机断层扫描（CBCT）是一种广泛用于骨评估的诊断工具。然而，头部方位对骨线性测量的影响仍存在争议。本研究旨在评估与标准参考相比，咬合平面或下颌平面方位是否能提供更准确的下颌高度和宽度测量值。
2024年，在伊斯兰阿扎德大学霍拉桑分校牙科学院对五具干燥的人类下颌骨进行成像。使用NewTom VGi evo设备获得CBCT扫描图像。扫描图像以DICOM格式导出，并在ONDEMAND软件中进行分析。在两种头部方位下进行测量：（1）咬合平面与地平线平行；（2）下颌平面与地平线平行。在下颌切牙、尖牙、前磨牙和磨牙部位，从牙槽嵴到下缘测量下颌高度。在相同部位从颊侧皮质板到舌侧皮质板测量骨宽度。测量位置预先用牙胶标记以确保一致性。然后将CBCT获得的测量值与卡尺测量值进行比较。
结果表明，与下颌平面与地平线平行的测量相比，咬合平面与地平线平行的测量通常更接近标准值。在尖牙部位的骨高度测量中观察到统计学上的显著差异：下颌平面（26.50毫米）与咬合平面（26.99毫米）（p = 0.004），并且与卡尺测量值（27.78毫米）相比，两个平面均显示出显著差异（下颌平面p = 0.005，咬合平面p = 0.018）。在前磨牙部位，卡尺测量值（28.57毫米）与两个平面（下颌平面：27.36毫米，p < 0.001；咬合平面：27.62毫米，p = 0.01）之间观察到显著差异。在尖牙部位的骨宽度测量中，两个平面均显示出显著差异（p = 0.047）。在磨牙部位未发现显著差异。
本研究表明，与下颌平面方位相比，将咬合平面与地平线对齐可使CBCT获得的下颌高度和宽度的线性测量更准确。因此，咬合平面可能是基于CBCT的骨测量的首选参考。
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