Senior research assistant, Department of Gerodontology and Removable Prosthodontics, University of Geneva, Geneva, Switzerland.
Am J Orthod Dentofacial Orthop. 2010 May;137(5):580.e1-580.e10; discussion 580-1. doi: 10.1016/j.ajodo.2009.03.039.
The aim of this study was to investigate a new digital 3-dimensional infrared video system to determine its accuracy, precision, and validity in measuring facial distances.
Bench experiments were performed by measuring the vertical and diagonal distances of chessboard squares of known length to determine the system's accuracy and precision. To test the system's validity, 16 healthy volunteers participated in this study. Vertical and horizontal distances of the face were measured electronically at rest, and on posed and aggressive smiles. All measurements were repeated after 8 weeks. Direct measurements of the intercanthal distance were obtained twice with calipers.
A minor systematic error was found in the bench experiments, with the highest absolute error of 0.227 +/- 0.39 mm. The analysis with this video system showed good reproducibility of all measured distances when the mean of 2 frames was used to compare distances. Digital measurements of the intercanthal distances showed high agreement with the clinically obtained values.
This digital video system can measure geometric distances in a 3-dimensional environment with high precision. Facial distances can be measured with good accuracy and precision, allowing applications in research and clinical practice.
本研究旨在探讨一种新的数字三维红外视频系统，以确定其测量面部距离的准确性、精密度和有效性。
通过测量已知长度的棋盘方格的垂直和对角线距离，进行台架实验以确定系统的准确性和精密度。为了测试系统的有效性，16 名健康志愿者参加了这项研究。在休息、摆姿势和有攻击性的微笑时，电子测量面部的垂直和水平距离。8 周后重复所有测量。使用卡尺两次直接测量内眦距离。
在台架实验中发现了一个小的系统误差，最大绝对误差为 0.227 +/- 0.39 毫米。使用 2 个帧的平均值来比较距离时，该视频系统的分析显示所有测量距离的重现性良好。内眦距离的数字测量与临床获得的值具有高度一致性。
这种数字视频系统可以在三维环境中以高精度测量几何距离。面部距离可以精确和精确地测量，允许在研究和临床实践中应用。
