Gwilliam Jamie R, Cunningham Susan J, Hutton Tim
Orthodontic Department, Eastman Dental Institute, University College London, London, UK.
Eur J Orthod. 2006 Oct;28(5):408-15. doi: 10.1093/ejo/cjl024. Epub 2006 Aug 10.
This study evaluated the reproducibility of 24 soft tissue landmarks on six three-dimensional (3D) facial scans. The scans were taken on a DSP400 facial scanner and were viewed using a customized software program. Intraoperator data were obtained by one researcher placing the 24 landmarks on all six scans a total of 30 times. Thirty different orthodontists of varying experience were then asked to place all 24 landmarks on each of the six facial scans in order to establish interoperator reproducibility. The standard deviations (SDs) from the mean were calculated from the data for each individual landmark in the x-, y-, and z-axes. For the intraoperator data, 12 of the 24 landmarks were found to be reproducible to within a 1 mm SD for each plane of space. The interoperator data showed lower reproducibility with just two landmarks showing less than a 1 mm SD in all three planes of space. Familiarity with 3D facial scans and associated software programs is important in improving reproducibility. In addition, the landmarks investigated in this study included those not often used. It is suggested that landmarks showing poor reproducibility for both inter- and intraoperator data should be avoided, if at all possible, or at least used with caution.
本研究评估了24个软组织标志点在六次三维（3D）面部扫描中的可重复性。扫描是在DSP400面部扫描仪上进行的，并使用定制软件程序进行查看。由一名研究人员在所有六次扫描上放置这24个标志点，共进行30次，从而获得了同一操作人员的数据。然后，邀请30位经验各异的正畸医生在六次面部扫描中的每一次上放置所有24个标志点，以确定不同操作人员之间的可重复性。根据每个标志点在x、y和z轴上的数据计算相对于平均值的标准差（SD）。对于同一操作人员的数据，发现24个标志点中有12个在每个空间平面上的标准差可重复性在1毫米以内。不同操作人员之间的数据显示出较低的可重复性，只有两个标志点在所有三个空间平面上的标准差小于1毫米。熟悉3D面部扫描和相关软件程序对于提高可重复性很重要。此外，本研究中调查的标志点包括那些不常用的。建议如果可能的话，应避免使用在不同操作人员和同一操作人员数据中可重复性都较差的标志点，或者至少谨慎使用。
