Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China.
Department of Stomatology, The First People's Hospital of Nantong, Nantong, China.
Dentomaxillofac Radiol. 2021 Feb 1;50(2):20200001. doi: 10.1259/dmfr.20200001. Epub 2020 Aug 13.
This study was aimed to investigate the accuracy of soft-tissue measurements obtained by two imaging modalities, three-dimensional (3D) photogrammetry and cone beam CT (CBCT) when confounded by influence factors (facial deformities and partitions).
60 wax facial models from facially deformed patients were captured by 3D photogrammetry and CBCT. 19 linear distances on each image were measured and juxtaposed to reference values attained via a coordinate-measuring machine (CMM) as the gold-standard. Paired -tests were used to compare linear accuracy of the test and reference systems. The influence of deformities and partitions (created by dividing the face with three vertical and five horizontal lines) on the measurement errors were analyzed by independent sample -test and one-way ANOVA.
Statistically significant differences were found between linear accuracy of the test and reference systems. The test values obtained by 3D photogrammetry were closer to the reference values than CBCT's. 3D photogrammetry's measurement errors were significantly higher in deformed areas, unlike CBCT's. Both systems reported significantly lower errors within partitions 8 and 13 compared to other partitions; for CBCT, aside from partitions 8 and 13, the differences in the errors for partitions 6 and 10 were significant compared to partitions 8, 12, 13, 14.
3D photogrammetry showed a higher linear accuracy than CBCT in patients with facial deformities due to protuberances. Facial reconstruction by both test modalities was significantly influenced in different facial partitions, but facial deformities extensively affected the results from 3D photogrammetry.
本研究旨在探讨在受影响因素（面部畸形和分区）干扰的情况下，两种成像方式——三维（3D）摄影测量和锥形束 CT（CBCT）——获得的软组织测量的准确性。
通过 3D 摄影测量和 CBCT 对 60 例来自面部畸形患者的蜡质面部模型进行了采集。在每张图像上测量了 19 条线性距离，并与通过坐标测量机（CMM）获得的参考值进行了对比，CMM 作为金标准。使用配对 t 检验比较了测试和参考系统的线性准确性。通过独立样本 t 检验和单因素方差分析分析了畸形和分区（通过三条垂直线和五条水平线将面部分割）对测量误差的影响。
测试和参考系统的线性准确性之间存在统计学显著差异。3D 摄影测量获得的测试值比 CBCT 的更接近参考值。3D 摄影测量的测量误差在畸形区域显著高于 CBCT，而 CBCT 的测量误差在所有分区中都显著低于 3D 摄影测量。与其他分区相比，3D 摄影测量和 CBCT 均报告分区 8 和 13 的误差明显较低；对于 CBCT，除分区 8 和 13 外，分区 6 和 10 的误差与分区 8、12、13 和 14 相比差异显著。
由于突起，3D 摄影测量在有面部畸形的患者中显示出比 CBCT 更高的线性准确性。两种测试方式对面部重建都有显著影响，但面部畸形对面部分区的结果影响广泛，而 3D 摄影测量的结果则受到广泛影响。
