目前的通用方法都是基于二次曲面的特征方程进行拟合，由于特征方程求解复杂，因此这些拟合软件在进行曲面拟合时均存在很多的限制条件。
Nowadays, general fitting methods are based on the character equations of quadratic surface to implement. For it is so complicated that a lot of fitting software exist a lot of restrict conditions.
方法：10例接受ITI种植的患者，在术前均接受螺旋CT和曲面断层的影像学检查。
Methods:10 patients received ITI implant treatment had image analysis by SCT and OP.
两二次曲面相交是工程构件中常遇到的问题。工程图样均用图解法画出它们的交线。
The intersecting of two conicoids is a frequent issue in the engineering components and their intersecting line in the engineering drafts are always drawn by means ofdiagrammatizing method.
所述自爬模设备的轨道及模板均呈直线状及直面状，或者均呈曲线状及曲面状。
A rail and a template of the self-ascending mold device are both in the shape of a straight line or straight surface, or are both in the shape of a curve or a curved surface.
所述自爬模设备的轨道及模板均呈直线状及直面状，或者均呈曲线状及曲面状。
A rail and a template of the self-ascending mold device are both in the shape of a straight line or straight surface, or are both in the shape of a curve or a curved surface.
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