Department of Orthodontics, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA.
Angle Orthod. 2010 Jan;80(1):58-64. doi: 10.2319/111408-583.1.
To assess whether 2D cephalometrics is comparable with 3D imaging devices and whether 3D technology could replace traditional 2D image capture in posttreatment evaluation.
The study is a prospective evaluation of superimposition techniques obtained from a cohort of 40 patients who underwent orthognathic surgery in a private practice environment. Surgical records were obtained from lateral cephalometric radiographs taken by a Kodak 8000C machine, and the 3D images were obtained from the 3dMD stereo photogrammetric camera capture system. Pre- and postlateral cephalometric records were superimposed on the cranial base (SN line) while pre- and post-3D surgical records were superimposed on the regional best-fit method. A mathematical algorithm, or best-fit calculation, was carried out on the selected surfaces. Each set of superimposed records was analyzed, and five soft tissue landmarks were plotted. The differences between the five surface points were analyzed for each set of records.
The final sample consisted of 34 subjects with full records. A total of 680 surface landmarks were plotted and analyzed. The mean differences of the soft tissue landmarks were analyzed for each pair of data sets and were found to range between 1.06 and 8.07 mm and 1.26 and 7.34 mm for lateral cephalometric and 3D readings, respectively. Paired t-tests were carried out using the SPSS 15.0 software, and they showed that the results were not statistically significant between the superimposition techniques on the image capture systems (P > .05).
The types of superimposition techniques used in the imaging modalities studied were comparable with one another.
评估二维头影测量是否可与三维成像设备相媲美，以及三维技术是否可以替代传统的二维图像采集在治疗后评估中。
这是一项对在私人执业环境中接受正颌手术的 40 名患者的叠加技术的前瞻性评估研究。手术记录取自柯达 8000C 机拍摄的侧位头颅侧位片，而 3D 图像则取自 3dMD 立体摄影摄像系统。将术前和术后的头颅侧位记录叠加到颅底（SN 线），而将术前和术后的 3D 手术记录叠加到区域最佳拟合方法。对所选表面进行数学算法或最佳拟合计算。对每一组叠加记录进行分析，并绘制五个软组织标志点。对每一组记录的五个表面点之间的差异进行分析。
最终样本由 34 名有完整记录的患者组成。共绘制和分析了 680 个表面标志点。对每一对数据集的软组织标志点的平均差异进行了分析，发现它们的范围分别为 1.06 至 8.07 毫米和 1.26 至 7.34 毫米，用于侧位头颅侧位片和 3D 读数。使用 SPSS 15.0 软件进行配对 t 检验，结果表明在图像采集系统上的叠加技术之间的结果没有统计学意义（P＞0.05）。
在所研究的成像方式中使用的叠加技术类型彼此相当。
