Naitoh Munetaka, Katsumata Akitoshi, Mitsuya Shogo, Kamemoto Hiromasa, Ariji Eiichiro
Department of Oral and Maxillofacial Radiology, School of Dentistry, Aichi-Gakuin University, 2-11, Suemori-Dori, Chikusa-Ku, Nagoya 464-8651, Japan.
Int J Oral Maxillofac Implants. 2004 Mar-Apr;19(2):239-46.
The trabecular bone patterns in jaws and tooth structure were analyzed using microfocus x-ray computerized tomography (micro-CT), and the usefulness of this method was reported. This study was performed to clarify the accuracy of micro-CT and to determine whether micro-CT could replace bone slice segments as a means for assessment of the accuracy of medical radiography units. In addition, the accuracy of compact CT for dental use (compact CT) was evaluated using the same method.
Three dried hemimandibles were used in this study. Images of mandibular interdental alveolar bone in the premolar and molar regions were obtained using micro-CT and compact CT. Measurement of the mandibular shape at 6 sites using micro-CT images and at 4 sites using compact CT images was performed, and then the values of the micro-CT and compact CT were compared with those of bone slice segments.
The accuracy of mandibular measurement and the ratios of agreement for micro-CT were significantly higher than those for compact CT. Moreover, the coefficient of correlation of the rate of trabecular bone between compact CT images and bone slice segment images was 0.916.
The significant difference in mandibular measurement between micro-CT and compact CT was considered to be related to pixel size.
Micro-CT can replace bone slice segments for assessment of the accuracy of medical radiography units. In addition, compact CT can be used for imaging diagnosis in dental implant treatment. It is suggested that the ratio of trabecular bone could be used to evaluate the bone density.
使用微焦点X射线计算机断层扫描（micro-CT）分析颌骨小梁骨模式和牙齿结构，并报告该方法的实用性。本研究旨在阐明micro-CT的准确性，并确定micro-CT是否可以替代骨切片作为评估医用放射成像设备准确性的手段。此外，使用相同方法评估牙科用紧凑型CT（紧凑型CT）的准确性。
本研究使用了三个干燥的半下颌骨。使用micro-CT和紧凑型CT获取前磨牙和磨牙区域下颌牙间牙槽骨的图像。使用micro-CT图像在6个部位测量下颌形状，使用紧凑型CT图像在4个部位测量下颌形状，然后将micro-CT和紧凑型CT的值与骨切片的值进行比较。
micro-CT的下颌测量准确性和一致性比率显著高于紧凑型CT。此外，紧凑型CT图像与骨切片图像之间的小梁骨率的相关系数为0.916。
micro-CT和紧凑型CT在下颌测量上的显著差异被认为与像素大小有关。
Micro-CT可以替代骨切片用于评估医用放射成像设备的准确性。此外，紧凑型CT可用于牙种植治疗的影像诊断。建议小梁骨率可用于评估骨密度。
