Lu Jiayi, Zhao Junyi, Gao Jing, Yu Haiyang
State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthetics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2022 Jan 25;40(1):52-60. doi: 10.7518/hxkq.2022.01.008.
This study aimed to investigate the quality of single crown digital models, enhance communication between clinicians and technicians, and improve the quality of restorations to further reduce remake rate.
A total of 1 312 single crown digital models (180 anterior teeth, 294 premolars, and 838 molars) were randomly selected from a large commercial dental factory. The digital models were evaluated by three investigators with the same working experience with the same intraoral scanning system (CEREC). CEREC SW 4.4 was used in capturing the images of single crown preparations, and prepCheck 3.1 was used in evaluating the quality of single crown digital models.
Approximately 6.55%, 0.08%, 81.17%, 19.59%, and 22.48% of 1 312 single crown digital models did not meet the standards of the undercut, surface quality, margin quality, buccal-lingual taper, and mesiodistal taper, respectively. Moreover, 23.25%, 28.51%, 28.43%, and 28.35% of the investigated single crown digital models did not meet the standards of the buccal inclination taper, lingual inclination taper, mesial inclination taper, and distal inclination taper, respectively. The quality of anterior teeth, premolars, molars at the margin quality, buccal-lingual taper, mesiodistal taper, buccal inclination taper, lingual inclination taper, mesial inclination taper, and distal inclination taper significantly varied in the evaluation results (<0.01).
In addition to the undercut and surface quality met the standard, the overall situation of the quality of the single crown digital preparation model was poor, and the quality of the preparation needs to be improved urgently.
本研究旨在调查单冠数字模型的质量，加强临床医生与技师之间的沟通，并提高修复体质量以进一步降低重做率。
从一家大型商业牙科工厂中随机选取1312个单冠数字模型（180颗前牙、294颗前磨牙和838颗磨牙）。由三名具有相同工作经验且使用相同口腔内扫描系统（CEREC）的研究人员对这些数字模型进行评估。使用CEREC SW 4.4获取单冠预备体的图像，并使用prepCheck 3.1评估单冠数字模型的质量。
在1312个单冠数字模型中，分别约有6.55%、0.08%、81.17%、19.59%和22.48%的模型在倒凹、表面质量、边缘质量、颊舌向锥度和近远中向锥度方面不符合标准。此外，分别有23.25%、28.51%、28.43%和28.35%的被调查单冠数字模型在颊侧倾斜锥度、舌侧倾斜锥度、近中倾斜锥度和远中倾斜锥度方面不符合标准。在前牙、前磨牙、磨牙的边缘质量、颊舌向锥度、近远中向锥度、颊侧倾斜锥度、舌侧倾斜锥度、近中倾斜锥度和远中倾斜锥度的评估结果中，质量存在显著差异（<0.01）。
除倒凹和表面质量符合标准外，单冠数字预备模型的质量总体情况较差，预备体质量亟待提高。
