The extraction of dental biological feature line is one of a key link in dental CAD/CAM, existing global feature extraction algorithms are difficult to realize accurate biological feature line. This paper presented a novel biological feature line extracting algorithm based on heuristic searching strategy. Firstly, feature information of the preparation tooth was analyzed. Secondly, an initial bio- logical feature line was extracted by mean of a heuristic searching strategy and then the feature line was optimized to ensure its quality. Finally, experiments based on 100 cases of clinical preparation teeth verified the effectiveness and practicability of the algorithm.%牙齿生物特征线的提取是数字化口腔修复体设计的关键环节,针对现有的全局特征提取算法难以准确实现生物特征线提取的局限,提出了一种基于启发式搜索策略的牙齿生物特征线提取技术。首先分析牙齿预备体三角网格模型的特征信息;其次在提取过程中设计启发函数评估最优特征点,自适应地提取生物特征线,并对提取结果进行形态优化以保证提取质量;最后通过对100余例临床牙齿预备体数据进行生物特征线提取实验,验证了算法的有效性和实用性。
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