颌骨缺损数字化模型网格数量减少对模型精度影响的研究  

Study on the impact of mesh reduction on the accuracy of digital models of maxillary defects

作　　者：潘景光[1,2] 刘昱晨 张婷民 王馨 白石柱 张生睿 PAN Jing-guang;LIU Yu-chen;ZHANG Ting-min;WANG Xin;BAI Shi-zhu;ZHANG Sheng-rui(PLA 63750 Military Hospital,Xi’an 710043,China;State Key Laboratory of Oral&Maxillofacial Reconstruction and Regenera-tion,National Clinical Research Center for Oral Diseases,Shaanxi Key Laboratory of Stomatology,Digital Dentistry Center,School of Stomatology,The Fourth Military Medical University,Xi’an 710032,China)

机构地区：[1]中国人民解放军63750部队医院,西安710043 [2]口颌系统重建与再生全国重点实验室、国家口腔疾病临床医学研究中心、陕西省口腔疾病临床医学研究中心、空军军医大学口腔医院数字化中心,西安710032

出　　处：《口腔颌面修复学杂志》2025年第2期116-120,共5页Chinese Journal of Prosthodontics

基　　金：国家自然科学基金面上项目(项目编号:82471035);陕西省创新能力支撑计划资助(项目编号:2023-CX-PT-27)。

摘　　要：目的:针对上颌骨缺损数字化模型进行网格数量减少操作,研究模型精度的变化,评价网格减少操作对模型精度的影响。方法:选择赵铱民分类的V类和Ⅶ类上颌骨缺损树脂模型各10个。使用口内扫描仪扫描得到数字化模型,保存为STL格式作为测试集。使用Meshmixer软件对原始模型分别进行网格数量90%、75%、50%和25%不同比例减少操作。对网格数量减少前后模型的三角面片数量、三角面片顶点数、模型文件大小和模型3D偏差等参数进行比较分析。结果:三角面片数量、三角面片顶点数和模型文件大小等参数随着网格减少数量的增加而减少;模型3D偏差随着网格减少数量增加而增大;50%网格数量减少条件下,模型组间3D偏差不存在统计学差异;75%网格数量减少条件下,模型组间3D偏差存在显著统计学差异。结论:对颌骨缺损数字化模型进行网格数量减少操作,50%比例以内与原模型对比精度不会受到影响;75%比例条件下模型3D偏差存在显著差异。Objective:To investigate the changes in model accuracy after mesh reduction in digital models of maxillary defects,in order to evaluate the impact of mesh reduction on model accuracy.Methods:Ten resin models of maxillary defects were selected.These models were scanned using an intraoral scanner to obtain digital models,which were saved in STL format as the test set.Meshmixer software was used to reduce the number of meshes in the original models by different proportions of 90%,75%,50%,and 25%.Parameters such as the number of triangular patches,the number of vertices of triangular patches,the size of model files,and the 3D deviation of the models were compared and analyzed before and after the reduction of mesh numbers.Results:The parameters such as the number of triangular patches,the number of vertices of triangular patches,and the size of model files decreased with the increase of mesh reduction.The 3D deviation of the models elevated with the increase in the reduction of mesh numbers.Under the condition of a 50%reduction in mesh numbers,there was no statistical difference in 3D deviation among the models within the same group.However,under the condition of a 75%reduction in mesh numbers,there were significant statistical differences in 3D deviation among the models within the same group.Conclusion:When reducing the number of meshes in digital models of maxillary defects,the accuracy of the models within a 50%reduction ratio will not be affected compared to the original models.However,under a 75%reduction ratio,there are significant differences in 3D deviation among the models.

关 键 词：颌骨缺损 数字化模型 网格减少 模型配准 3D偏差 

分 类 号：R783.3[医药卫生—口腔医学]