数字化牙体预备引导技术的精度研究  

Evaluation of Accuracy for Digital Tooth Preparation Guidance Technology

作　　者：陈亮 张心怡 邢桢权 李欣[1] CHEN Liang;ZHANG Xinyi;XING Zhenquan;LI Xin(Department of Prosthodontics,Hospital of Stomatology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学口腔医学院修复科,甘肃兰州730000

出　　处：《口腔医学研究》2023年第5期450-454,共5页Journal of Oral Science Research

摘　　要：目的:比较数字化牙体预备引导技术与自由手、引导导板以及自限性车针牙体预备技术在不同阶段的精度。方法:利用3D打印技术将虚拟诊断模型打印成20个树脂模型并分为4组。第1组采用自由手预备,第2组采用三段式指示导板引导牙体预备,第3组采用自限性车针引导牙体预备,第4组采用数字化定深导板引导牙体预备。分别扫描定深标志制备完成后和牙体预备完成后的模型,将这些模型数据与虚拟诊断模型匹配,分别测量每组定深标志深度以及牙体预备量。结果:4组定深标志实际预备深度与预设值之间的偏差量分别为(76±19)μm、(95±17)μm、(65±14)μm、(54±15)μm,具有统计学差异(P<0.0001);实际牙体预备量与预设值之间的偏差量分别为(151±22)μm、(129±21)μm、(102±22)μm、(78±17)μm,具有统计学差异(P<0.0001);精修过程会导致额外牙体组织损失,其损失量与牙体预备引导方式有关(P<0.001)。结论:数字化牙体预备引导技术在牙体预备各个阶段精度都高于传统非定量牙体预备引导技术;4种方法在精修阶段都会导致额外的牙体组织损失。Objective:To compare the accuracy of digital tooth preparation guidance technique with traditional tooth preparation techniques at different stages.Methods:The virtual diagnostic wax-up was printed into 20 resin models by 3D printing and divided into 4 groups.Group 1:use free-hand for tooth preparation;group 2:use a three-stage indicator template to guide the tooth preparation;group 3:use a self-limiting diamond burs to guide the tooth preparation;and group 4:use a rigid-constraint template to guide the tooth preparation.The models data were imported into the measurement software and matched with the virtual diagnostic wax-up to measure the depth of the indicator and tooth preparation.Results:The deviations of the indicator depth in the four groups were(76±19)μm,(95±17)μm,(65±14)μm,and(54±15)μm,respectively(P<0.0001).The deviations of the preparation depth were(151±22)μm,(129±21)μm,(102±22)μm,and(78±17)μm,respectively(P<0.0001).The loss of tooth tissue was different among four tooth preparation methods(P<0.05).Conclusion:The accuracy of digital tooth preparation guidance technique is higher than that of traditional non-quantitative tooth preparation guidance techniques in all stages of tooth preparation.Either method has additional tissue loss during the finishing stage.

关 键 词：瓷贴面修复 修复空间 引导技术 精确度 

分 类 号：R783.3[医药卫生—口腔医学]