Tian Hua, Wu Bu-ling, Bi Zhen-yu, Jiao Pei-feng, Zhao Wei-dong, Sun Feng-yang, Xu Hui-yong, Liu Yang
Department of Stamatology, Southern Medical University, Guangzhou 510515, China.
Nan Fang Yi Ke Da Xue Xue Bao. 2011 May;31(5):864-6.
To establish a convenient and rapid method for constructing a digital model of the maxillofacial soft tissue based on three-dimensional laser surface scanning to allow direct and accurate observation of the soft tissue changes in the course of orthodontic treatment.
The point cloud data of three-dimensional laser scanning of the maxillofacial region were acquired from a healthy woman with Angle Class I occlusion, who maintained a horizontal Frankfort plane during scanning with the scanner placed at a distance of 80 cm. The scanning was repeated twice after wearing the dental cast for an Angle Class I occlusion. The three-dimensional digital model of the maxillofacial soft tissue was constructed based on the point cloud using GeoMagic10.0 software.
The high-resolution three-dimensional model of the maxillofacial soft tissue reconstructed allowed accurate observation of the distinct facial anatomical landmarks and represented directly the soft tissue changes in the process of orthodontic treatment by merging the models. Using the analytic tool provided by the software, this model also allowed direct quantitative measurement of the nasolabial angle and the distances from the esthetic plane to the upper lip, labral inferior, and mentolabial sulcus, which were 111.86°, -3.57 mm, -2.54 mm, and 3.95 mm before orthodontic treatment as compared to 114.31°, -2.73 mm, -1.06 mm, and 3.46 mm during treatment, and 116.53°, -0.15 mm, 0.64 mm, and 3.11 mm after the treatment, respectively.
Three-dimensional laser surface scanning enables accurate and rapid construction of the digital model of the facial soft tissues, which may provide valuable assistance in orthodontic treatment.
建立一种基于三维激光表面扫描构建颌面软组织数字模型的便捷快速方法，以便直接准确地观察正畸治疗过程中的软组织变化。
从一名安氏I类咬合的健康女性获取颌面区域三维激光扫描的点云数据，扫描时扫描仪距离患者80 cm，患者保持法兰克福平面水平。佩戴安氏I类咬合的石膏模型后重复扫描两次。使用Geomagic10.0软件基于点云构建颌面软组织的三维数字模型。
重建的颌面软组织高分辨率三维模型能够准确观察到明显的面部解剖标志点，通过合并模型直接呈现正畸治疗过程中的软组织变化。利用该软件提供的分析工具，该模型还能直接对鼻唇角以及审美平面到上唇、唇下缘和颏唇沟的距离进行定量测量，正畸治疗前分别为111.86°、-3.57 mm、-2.54 mm和3.95 mm，治疗期间分别为114.31°、-2.73 mm、-1.06 mm和3.46 mm，治疗后分别为116.53°、-0.15 mm、0.64 mm和3.11 mm。
三维激光表面扫描能够准确快速地构建面部软组织数字模型，可为正畸治疗提供有价值的辅助。
