Li Z, Liu Y S, Wang S M, Zhang R, Jia L, Ye H Q, Hu W J, Zhao W Y, Liu Y S, Zhou Y S
Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
2nd Dental Center, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2020 Dec 25;53(1):62-68. doi: 10.19723/j.issn.1671-167X.2021.01.010.
To explore the preliminary application of "biocopy function" in digital technology of temporary crown in severe tooth attrition, so as to reduce the difficulty of final restoration adjustment in severe tooth wear cases, and save clinical time.
Twelve patients aged between 40 and 65 years with severe tooth attrition were recruited in this study. The experimental group (6 cases, 3 females and 3 males) used the method of digital copy of temporary restoration shape when making the final restoration, and the control group (6 cases, 3 females and 3 males) used the traditional method to make the final restoration. The mean time of central occlusal adjustment and protrusive and lateral occlusal adjustment of each crown, the number of follow-up visits of the patients were recorded and statistically analyzed. The occlusal comfort of the first and the third months after wearing the prosthesis was evaluated by the patients, and the difference of the occlusal comfort of the final prosthesis made by the two methods was compared (the full score was 10 points). The occlusal adjustment time and occlusal comfort score were used as measurement data. Single sample test was used. The number of follow-up visits was count data. Rank sum test was used for non-normal continuous variables.
The mean occlusal time of each crown adjustment in the experimental group was significantly lower than that in the control group ( < 0.01), and the median number of follow-up visits in the experimental group was lower than that in the control group ( < 0.01). The average occlusal comfort score of the experimental group was higher than that of the control group at the first time ( < 0.01). After three months of crown wearing, the median occlusal comfort score of the experimental group was higher than that of the control group ( < 0.05).
In the case of severe tooth attrition, it is feasible to use the "biocopy function" in the design software to design the final prosthesis, which is conducive to reduce the difficulty of adjustment and achieve predictable functional and aesthetic effects, which is of great significance to save clinical time and improve the accuracy of restoration.
探讨“生物复制功能”在重度牙齿磨损临时冠数字化技术中的初步应用，以降低重度牙齿磨损病例最终修复调整的难度，节省临床时间。
本研究招募了12例年龄在40至65岁之间的重度牙齿磨损患者。实验组（6例，3女3男）在进行最终修复时采用临时修复体外形数字复制法，对照组（6例，3女3男）采用传统方法进行最终修复。记录并统计分析每个牙冠的正中咬合调整、前伸和侧方咬合调整的平均时间，患者的随访次数。由患者评估戴用义齿后第1个月和第3个月的咬合舒适度，并比较两种方法制作的最终义齿咬合舒适度的差异（满分10分）。咬合调整时间和咬合舒适度评分作为计量资料，采用单样本t检验。随访次数为计数资料，对于非正态连续变量采用秩和检验。
实验组每个牙冠调整的平均咬合时间显著低于对照组（P<0.01），实验组随访次数中位数低于对照组（P<0.01）。实验组第1次平均咬合舒适度评分高于对照组（P<0.01）。戴冠3个月后，实验组咬合舒适度评分中位数高于对照组（P<0.05）。
在重度牙齿磨损病例中，利用设计软件中的“生物复制功能”设计最终修复体是可行的，有利于降低调整难度，获得可预测的功能和美学效果，对节省临床时间和提高修复精度具有重要意义。
