Fuhrmann R
Klinik für Kieferorthopädie, RWTH Aachen.
J Orofac Orthop. 1996 Jun;57(3):168-85. doi: 10.1007/BF02191880.
For quantitative evaluation of the different imaging quality of cephalograms and computed tomography in the region of the lower incisors, the macroscopic and histological findings of specimens were compared with the corresponding radiological findings. After removal of the soft tissue from 11 mandibular dentate segments, 15 artificial bone defects of different dimensions were produced in the region of the lower incisors. In comparison with the microscopic jaw measurements, the mean labiolingual diameter of the frontal alveolar process of the single incisors was overestimated in the cephalograms by 0.3 to 1.2 mm. Most of the anatomical-radiological correlations of the cephalometric measurements was insignificant. Individual metric assessment of the labiolingual bone width or of the facial/lingual cortical bone plates or the identification of the artificial defects of lower incisors in the cephalograms were generally not possible. In the CT-images the mean labiolingual diameter of the frontal alveolar process of the single incisors was overestimated by 0.1 to 0.5 mm, but the correlations were highly significant. The facial/lingual cortical bone plates of the lower incisors were evaluated and measured in the CT-scans. Thirteen of 15 artificial bone defects (80%) were identified in the CT-scans. CT-scanning is the only imaging technique offering three-dimensional quantitative evaluation of the labiolingual alveolar bone width and the facial/lingual cortical bone plates.
为了定量评估头颅侧位片和计算机断层扫描在下切牙区域的不同成像质量，将标本的宏观和组织学结果与相应的放射学结果进行比较。从11个下颌有牙段去除软组织后，在下切牙区域制造了15个不同尺寸的人工骨缺损。与微观颌骨测量相比，头颅侧位片中单个切牙的额牙槽突平均唇舌径被高估了0.3至1.2毫米。大多数头影测量的解剖学与放射学相关性不显著。通常无法在头颅侧位片中对单个切牙的唇舌骨宽度、面部/舌侧皮质骨板进行单独的测量评估，也无法识别下切牙的人工缺损。在CT图像中，单个切牙的额牙槽突平均唇舌径被高估了0.1至0.5毫米，但相关性非常显著。在CT扫描中对下切牙的面部/舌侧皮质骨板进行了评估和测量。在CT扫描中识别出了15个人工骨缺损中的13个（80%）。CT扫描是唯一能够对唇舌牙槽骨宽度和面部/舌侧皮质骨板进行三维定量评估的成像技术。
