Abstract: Objective: To establish a convenient and precise method for the measurement of clinical and post-operational 3-dimensional (3-D) morphology of the maxilla. Methods: Data from the maxilla of 30 healthy individuals were collected and aided by spiral CT. 3-D morphologies were reconstructed using SimPlant software, which were marking landmarks, setting 3-D coordinate system, confirming the reproducibility of the landmarks, and measuring these distances between landmarks and the 3-D coordinate system. Results: All these 35 landmarks wrer confirmed to be  perfect reproducibility(P＞0.05). Mean distances and standard deviations were obtained from normal adults' maxillary landmarks to three-dimensional coordinate system. There were no statistical  differences between bilateral symmetry landmarks in three-dimensional distances(P＞0.05). Centered landmarks were located in sagittal coordinate plane(P＞0.05). After asymmetric ratio formula, Q=(G-K)/G×100％ were applied, the Q values of all cases were all less than 10%, which means all bilateral symmetry landmarks were no asymmetric deformities in three-dimensional directions. Conclusion:  3-d measurement of maxillary morphology using spiral CT and SimPlant11.04 software is reliable. It may be beneficial in the analysis of the  malformed maxillae in postop-erative adult patients with unilateral complete cleft lip and/or  palate.

Key words: spiral CT, maxillary morphology, 3-dimensional measurement

摘要： 目的：本研究旨在建立一套精确的三维测量上颌骨形态的方法。方法：采用螺旋CT收集30例正常成年人上颌骨三维数据，应用SimPlant 11.04软件对数据进行重建、定点、建立三维坐标系，验证标志点可重复性、测量点到坐标平面的距离，应用SAS 6.12软件初步分析数据，采用t检验进行统计学分析。结果：35个标志点具良好的可重复性（P＞0.05）；获得标志点到三维坐标的平均距离、标准差；左右对称标志点的三维距离差异无统计学意义（P＞0.05），居中的标志点在矢状坐标平面上（P＞0.05）； 经用非对称率公式：Q=(G-K)/G×100％验证，均Q＜10%,左右对称标志点在三维上无不对称畸形。结论：本研究建立一套应用螺旋CT及软件精确三维测量上颌骨形态的方法，为分析单侧完全性唇腭裂术后成年患者的上颌骨形态提供了方法基础。

关键词: 螺旋CT, 上颌骨形态, 三维测量

CLC Number: 

• R782.2

• R816.98