Adjunct Professor, Oral Radiology, Department of Stomatology, School of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Brazil.
Associate Professor, Oral Radiology, Section of Oral Radiology, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2018 Nov;126(5):432-438. doi: 10.1016/j.oooo.2018.06.004. Epub 2018 Jun 27.
The aim of this study was to assess the accuracy of detecting and measuring buccal bone thickness (BBT) adjacent to titanium implants in cone beam computed tomography (CBCT) images.
Titanium implants (1, 2, or 3), abutments, and metal-ceramic crowns were inserted into 40 bone blocks with various BBTs. CBCT images were acquired in various settings: Voxel sizes (0.2 and 0.13 mm) and reconstruction section thicknesses (2.0 and 5.0 mm) were assessed by 3 examiners. True BBT was measured in digital photographs of the bone blocks. Buccal bone detection was evaluated by sensitivity and specificity. BBT was evaluated by 1-way analysis of variance (ANOVA) between the true and the CBCT measurements and by calculating the difference between the true measurement and the CBCT measurement (Di-BBT).
Detection of buccal bone exhibited high sensitivity (0.86-1) and low specificity (0.14-1). More implants in the field of view, large voxel size, and thick image reconstruction sections had a negative impact on buccal bone detection. ANOVA showed statistically significantly larger BBT for the CBCT measurements in all settings (1.07-1.21 mm) compared with the true measurements (0.85 mm). Di-BBT was mostly within 0.5 mm.
BBT adjacent to titanium implants is overestimated when evaluated on CBCT cross-sectional images.
本研究旨在评估在锥形束计算机断层扫描（CBCT）图像中检测和测量钛种植体颊侧骨厚度（BBT）的准确性。
将钛种植体（1、2 或 3）、基台和金属陶瓷冠插入具有不同 BBT 的 40 个骨块中。通过 3 名检查者评估了不同的 CBCT 图像设置：体素大小（0.2 和 0.13 毫米）和重建截面厚度（2.0 和 5.0 毫米）。通过对骨块的数字照片测量真实的 BBT。通过灵敏度和特异性评估颊侧骨检测。通过对真实测量值和 CBCT 测量值之间的差异（Di-BBT）进行单向方差分析（ANOVA）评估 BBT。
颊侧骨检测具有高灵敏度（0.86-1）和低特异性（0.14-1）。视野中更多的种植体、较大的体素大小和较厚的图像重建截面会对颊侧骨检测产生负面影响。ANOVA 显示，在所有设置中，CBCT 测量值的 BBT 均明显大于真实测量值（1.07-1.21 毫米）（0.85 毫米）。Di-BBT 大多在 0.5 毫米以内。
在 CBCT 横断面上评估时，钛种植体颊侧的 BBT 被高估。
