网格数量简化对单冠修复体外形体积及正确度影响的研究  

The effects of mesh reduction on the volume and trueness of single-crown restorations

作　　者：王馨 马旦 刘琛 刘昱晨 白石柱 WANG Xin;MA Dan;LIU Chen;LI U Yuchen;BAI Shizhu(State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration,National Clinical Research Center for Oral Diseases,Shaanxi Key Laboratory of Stomatology,Digital Dentistry Center,The Third Hospital Affiliated of Air Force Military Medical University,China,Xi'an 710032)

机构地区：[1]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,陕西省口腔医学重点实验室,空军军医大学第三附属医院数字化口腔医学中心,西安710032

出　　处：《实用口腔医学杂志》2024年第1期31-35,共5页Journal of Practical Stomatology

基　　金：国家自然科学基金(编号:81970987)。

摘　　要：目的:评价网格数量简化后对单冠修复体体积及外形正确度的影响。方法:选取15个单冠修复体,导入3D分析软件,简化网格数量至75%、 50%、 25%、 10%、 5%,分别计算并比较不同比例简化后修复体的体积,文件大小和特定区域的网格边长;用曲线裁剪修复体肩台、组织面(除肩台)以及咬合面区域与未简化修复体的相应部位进行偏差分析,通过均方根误差(RMS)值对不同区域的外形正确度进行评价。结果:网格数量简化后对单冠修复体体积未见显著影响(P>0.05),对文件大小(P<0.001),网格边长(P<0.001)和修复体肩台(P<0.001)、组织面(除肩台)(P<0.001)以及咬合面(P<0.001)各个区域的外形正确度有显著影响。结论:简化网格数量对修复体的总体体积影响不大,但会显著影响其外形的正确度。Objective:To assess the impact of reducing the mesh density on the overall volume and trueness of single-crown restorations.Methods:15 single-crown restorations were included,and their mesh density in 3D software was simplified by 75%,50%,25%,10%and 5%respectively.The overal volume,file size and mesh edge length of the restorations with different reduction levels were compared.Deviation analysis was conducted by curving clipping the area of the shoulder,tissue surface(except for the shoulder)and occlusal surface of the restorations and compared with those of the corresponding regions in the non-simplified restorations.Trueness was assessed using the root mean square(RMS)values for the volume and trueness of different areas.Results:Reducing the mesh density did not significantly affect the overal volume of the single-crown restorations(P>0.05),but it had a significant impact on the file size(P<0.001),mesh edge length(P<0.001)and the trueness of the shoulder(P<0.001),tissue surface(except for the shoulder)(P<0.001)and occlusal surface(P<0.001)areas.Conclusion:Reducing the mesh density had little impact on the overall volume of the restorations but significantly affected their trueness.

关 键 词：CAD/CAM 单冠修复体 网格简化 正确度 3D偏差 RMS值 

分 类 号：R783.3[医药卫生—口腔医学] TP391.73[医药卫生—临床医学]