Oral Imaging Centre, Department of Oral Pathology and Maxillofacial Surgery, Katholieke Universiteit Leuven, Leuven, Belgium.
J Oral Rehabil. 2010 May 1;37(5):352-8. doi: 10.1111/j.1365-2842.2010.02065.x. Epub 2010 Feb 18.
The use of three-dimensional (3D) models of the dentition obtained from cone beam computed tomography (CBCT) is becoming increasingly more popular in dentistry. A recent trend is to replace the traditional dental casts with digital CBCT models for diagnosis, treatment planning and simulation. The accuracy of these models was previously assessed through comparing linear physical and radiographical measurements. However, this assessment technique is both observer and landmark dependent. The accuracy of 3D CBCT teeth reconstructions is yet to be reliably measured. To assess the accuracy of 3D CBCT reconstructions of the teeth using a semi-automated and observer-independent method and to assess the influence of field of view (FoV) selection on reconstruction accuracy. Fully dentate upper and lower dry human jaws, placed in a plastic box and immersed in water, were scanned using CBCT with small, medium and large FoV. The teeth were then scanned separately using MicroCT. Cone beam computed tomography and MicroCT 3D teeth models were compared, and mean surface difference was calculated per tooth for each FoV. Mean and (maximum) differences between MicroCT and CBCT were 120 +/- 40 (max. 679) microm, 157 +/- 39 (max. 824) micro and 207 +/- 80 (max. 862) microm for the small, medium and large FoV, respectively. Cone beam computed tomography models were larger than MicroCT because of larger voxel size. Our results indicate that CBCT may provide accurate 3D reconstructions of the teeth that can be useful for some clinical applications.
基于锥形束 CT（CBCT）获得的牙齿三维（3D）模型在牙科领域的应用正变得越来越普遍。最近的一个趋势是用数字 CBCT 模型代替传统的牙模，用于诊断、治疗计划和模拟。这些模型的准确性之前是通过比较线性物理和射线测量来评估的。然而，这种评估技术既依赖于观察者，也依赖于基准点。3D CBCT 牙齿重建的准确性尚未得到可靠测量。使用半自动和观察者独立的方法评估 3D CBCT 牙齿重建的准确性，并评估视野（FOV）选择对重建准确性的影响。将完全有牙的上颌和下颌干人头骨放置在塑料盒中并浸入水中，使用具有小、中、大 FOV 的 CBCT 进行扫描。然后使用 MicroCT 分别扫描牙齿。比较锥形束 CT 和 MicroCT 的 3D 牙齿模型，并为每个 FOV 计算每颗牙齿的平均表面差异。对于小、中、大 FOV，MicroCT 和 CBCT 之间的平均差异（最大差异）分别为 120 +/- 40（最大 679）μm、157 +/- 39（最大 824）μm 和 207 +/- 80（最大 862）μm。由于体素尺寸较大，CBCT 模型大于 MicroCT。我们的结果表明，CBCT 可为一些临床应用提供准确的牙齿 3D 重建。
