Doctoral student, Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology and National Clinical Research Center for Oral Disease, Beijing, PR China.
Attending Doctor, Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology and National Clinical Research Center for Oral Disease, Beijing, PR China.
J Prosthet Dent. 2021 Apr;125(4):651-656. doi: 10.1016/j.prosdent.2020.02.010. Epub 2020 Apr 21.
The triple-scan method for assessing the 3D adaptation of dental restorations has been introduced and reported to be reliable. However, the suitability of using a dental laboratory scanner in the triple-scan method has not been evaluated.
The purpose of this in vitro study was to evaluate the suitability of the triple-scan method using a dental laboratory scanner to assess the 3D adaptation zirconia crowns.
A zirconia abutment and a zirconia crown were fabricated, and the abutment was fixed in a custom-made base. The crown was seated onto the abutment with the interposition of light-body silicone impression material between them. The triple-scan method was performed by using a dental laboratory scanner, and the mean cement-gap thickness was calculated. The seating and digitalization process was repeated 10 times, and after each digitalization, the light-body silicone layer was stabilized by applying heavy-body silicone impression material over it. Cement-gap thickness was measured on cross-sections of the aligned scan data sets and of the physical silicone replica. The results were assessed by using the paired t test and the Bland-Altman method (α=.05).
Mean 3D cement-gap thickness assessed by the triple-scan method reported small dispersion with a coefficient of variation of 5.6% for the occlusal area, 1.9% for the axial area, and 6.4% for the margin area. Cement gap thickness measured at corresponding locations in the aligned scan data sets and in the physical silicone replica reported no significant difference (P=.326) and good agreement.
The cement gap was accurately duplicated in scan data sets. The triple-scan method by using a dental laboratory scanner is suitable for assessing the 3D adaptation of zirconia crowns.
三重扫描法已被引入并报道为评估牙体修复体三维适配的可靠方法。然而，尚未评估使用牙科实验室扫描仪在三重扫描方法中的适用性。
本体外研究的目的是评估使用牙科实验室扫描仪评估氧化锆全冠三维适配的三重扫描方法的适用性。
制作氧化锆基台和氧化锆冠，将基台固定在定制底座上。将冠体置于基台上，两者之间用轻体硅橡胶印模材料隔开。通过使用牙科实验室扫描仪执行三重扫描方法，并计算平均粘结剂间隙厚度。该过程重复 10 次，每次数字化后，通过在其上施加重体硅橡胶印模材料来稳定轻体硅橡胶层。在对齐的扫描数据集和物理硅橡胶复制品的横截面测量粘结剂间隙厚度。使用配对 t 检验和 Bland-Altman 方法（α=.05）评估结果。
三重扫描法评估的平均 3D 粘结剂间隙厚度显示出小的分散性，其中咬合区的变异系数为 5.6%，轴向区为 1.9%，边缘区为 6.4%。在对齐的扫描数据集和物理硅橡胶复制品中相应位置测量的粘结剂间隙厚度无显著差异（P=.326），且具有良好的一致性。
扫描数据集中准确地复制了粘结剂间隙。使用牙科实验室扫描仪的三重扫描方法适用于评估氧化锆冠的三维适配。
