This work is aimed to conduct surface local deformation of tooth restoration by driving feature curves, and create a digital model in accordance with oral condition of patients. The control points were selected on the surface of tooth restoration using computer mouse to construct the feature curves, which were then projected to the surface tooth restoration to generate projective curves. Second, the deformed region was computed with projective curves and deformed radius, and next the mapping relation was created between the points in the deformed region and the feature curves through KD-Tree data structure. At last, the local deformation was completed by means of adjusting the position of control points under the occlusal constrains. The proposed algorithm is effective and feasible. The algorithm could complete the surface local deformation of tooth restoration effectively and steadily.%通过特征曲线驱动牙齿修复体曲面局部变形,进行修复体表面形态设计,创造出符合患者口腔系统功能的修复体数字化模型.首先在修复体曲面上,用鼠标交互式选取控制点构造特征曲线,并将特征曲线投影到曲面上生成投影曲线；接着利用投影曲线,根据定义的变形半径计算特征曲线影响的变形区域,并用KD树结构建立变形区域内的点和特征曲线的映射关系；最后根据邻牙和对颌牙的约束关系,改变控制点编辑特征曲线,即能通过特征曲线驱动修复体曲面局部变形.通过前牙牙尖的局部变形,以及邻牙约束条件下前牙的修复实例,验证算法的实用性.结果表明,所提出的算法能稳定高效地完成牙齿修复体曲面的局部变形.
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