Doan Tri Minh, Nguyen Tan Ngoc, Pham Van-Khoa, Chotprasert Natdhanai, Vu Chau Tran Bao
Department of Prosthodontics, Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam.
Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam.
BMC Oral Health. 2024 Dec 28;24(1):1566. doi: 10.1186/s12903-024-05361-9.
The success of a restoration largely depends on the quality of its fit. This study aimed to investigate the fit quality of monolithic zirconia veneers (MZVs) produced through traditional and digital workflows.
A typodont maxillary right central incisor was prepared. The maxillary arch with the prepared tooth was scanned with Trios 3 Pod intra-oral scanner (IOS), which served as a pattern to create thirty 3D resin models through printing. Additionally, thirty conventional impressions of the maxillary with the prepared tooth were taken using polyvinyl siloxane (PVS) impression material. These impressions were cast using dental gypsum products to create thirty stone dies, which were then scanned externally. Sixty MZVs were milled from multi-layered zirconia disks. The marginal and internal gaps of restorations were assessed using the silicone replica technique.
The highest marginal accuracy for both the conventional and digital impression groups was observed in the cervical area, with values of 74.6 μm and 61.9 μm, respectively. The smallest internal gaps for both groups were also recorded in the cervical area, at 109.9 μm for the conventional group and 109.7 μm for the digital group. The digital group exhibited better marginal fit, particularly in the incisal and mesial areas (79.3 μm and 75.7 μm, respectively), compared to the conventional group (88.1 μm and 90.8 μm). No statistically significant differences in internal fit were observed.
MZVs fabricated using the digital workflow exhibited superior marginal fit compared to those fabricated using the conventional workflow, though both techniques yielded clinically acceptable results.
修复体的成功很大程度上取决于其密合质量。本研究旨在调查通过传统和数字工作流程制作的整体式氧化锆贴面（MZVs）的密合质量。
制备一个牙模型上颌右侧中切牙。使用Trios 3 Pod口内扫描仪（IOS）对上颌牙弓及制备好的牙齿进行扫描，该扫描结果作为通过打印创建30个三维树脂模型的模板。此外，使用聚乙烯基硅氧烷（PVS）印模材料对制备好牙齿的上颌进行30次传统印模制取。这些印模用牙科石膏产品灌模以制作30个石膏模型，然后对其进行外部扫描。从多层氧化锆盘上铣削出60个MZVs。使用硅橡胶复制技术评估修复体的边缘和内部间隙。
传统印模组和数字印模组在颈部区域均观察到最高的边缘精度，分别为74.6μm和61.9μm。两组最小的内部间隙也记录在颈部区域，传统组为109.9μm，数字组为109.7μm。与传统组（分别为88.1μm和90.8μm）相比，数字组表现出更好的边缘适合性，尤其是在切端和近中区域（分别为79.3μm和75.7μm）。在内部适合性方面未观察到统计学上的显著差异。
与使用传统工作流程制作的MZVs相比，使用数字工作流程制作的MZVs表现出更好的边缘适合性，尽管两种技术均产生了临床可接受的结果。
