部分缺失牙齿咬合面自适应重建算法

针对数字化口腔修复技术能够高效、可靠地实现对缺损牙体精确修复的特点,提出了一种部分缺失牙齿咬合面自适应重建算法,通过变形对应牙位上的标准牙模型得到重建后的缺失咬合面。首先基于缺损牙体的洞缘线信息将其划分为内、外两个标识区域;其次设计分块策略将标准牙曲面划分为3个变形区域;最后对标准牙施加微分变形操作,将与缺失区域相对应的标准牙曲面作为重建后的咬合面。对3类常见的嵌体预备牙型的修复体设计试验表明,重建后的咬合面均能够保持局部细节形态,与预备体缺失区域匹配良好,为口腔修复CAD/CAM系统的临床应用提供了一套完整的嵌体修复体设计方案。

Partially Missing Dental Occlusion Surface Adaptive Reconstruction Algorithm

Dental CAD/CAM requires the ability to produce an accurate restoration efficiently and reliably.According to these special characteristics,an adaptive reconstruction algorithm to recover partially missing dental occlusion surface was proposed in this paper.The damaged dental can be designed by deforming the template dental which is in the corresponding position.By the First step,the damaged dental was segmented into interior part and exterior part based on the cavity contour information;next,a template dental was segmented into three parts by means of region segmentation strategy;after adaptive deformation,the part above the cavity was cut as the occlusion surface.Clinical experiments on three kinds of inlay demonstrated that the reconstructed occlusion surface preserved local geometric details and matched well with the preparation tooth.The algorithm provided a complete practical inlay design proposal for clinic application in dental CAD/CAM.