School of Mechanical Engineering (SMEC), VIT University, Vandalur-Kelambakkam road, VIT Chennai Campus, Chennai, Tamilnadu, 600127, India.
Lithoz GmbH, Oberlaaer Straße 228, Vienna, 1100, Austria.
BMC Oral Health. 2023 May 11;23(1):276. doi: 10.1186/s12903-023-02974-4.
The study aims to evaluate the wear surface using 3D surface roughness and other material characterization of zirconia fabricated using photopolymerization based Lithography-based Ceramic Manufacturing (LCM).
LCM technology was used to fabricate zirconia specimens of size 10 × 10 × 2mm. Scanning Electron Microscope, 3D-profilometer, X-ray Diffraction, and hardness test characterized the samples before and after wear and Coefficient of friction (COF) was monitored.
The COF was around 0.7 and did not differ much between the horizontally and vertically printed specimens. However, the surface roughness after wear for horizontally printed specimen was 0.567 ± 0.139 μm, while that for vertically printed specimen was 0.379 ± 0.080 μm. The reduced valley depth and the dale void volume were low for the vertically printed zirconia specimen, indicating lesser voids and low fluid retention. In addition, it was observed that the hardness value of the vertically printed sample was better. The scanning electron microscopic images and 3D surface profiles of the zirconia specimens depicted the surface topography and revealed the wear track.
The study shows that zirconia fabricated using LCM technology possesses surface roughness of about 0.5 μm with no machining scars that are usually associated with CAD/CAM dentistry and also indicating agreement with clinically acceptable values for minimal surface roughness of dental restorations. Dental restorations using LCM fabricated zirconia redues the requirement of post-processing work flow that is part of CAD/CAM dentistry.
本研究旨在通过 3D 表面粗糙度评估和其他材料特性来评价使用基于光聚合的立体光造型陶瓷制造（LCM）技术制造的氧化锆的磨损表面。
使用 LCM 技术制造尺寸为 10×10×2mm 的氧化锆样本。扫描电子显微镜、3D 轮廓仪、X 射线衍射和硬度测试对磨损前后的样品进行了特征描述，并监测了摩擦系数（COF）。
COF 约为 0.7，水平和垂直打印的样本之间没有太大差异。然而，水平打印样本的磨损后表面粗糙度为 0.567±0.139μm，而垂直打印样本的表面粗糙度为 0.379±0.080μm。垂直打印的氧化锆样本的谷底深度和凹陷体积较小，表明空隙较少，流体保留率较低。此外，观察到垂直打印样品的硬度值更好。氧化锆样本的扫描电子显微镜图像和 3D 表面轮廓描绘了表面形貌，并揭示了磨损轨迹。
本研究表明，使用 LCM 技术制造的氧化锆具有约 0.5μm 的表面粗糙度，没有通常与 CAD/CAM 牙科相关的加工痕迹，这也表明与牙科修复体最小表面粗糙度的临床可接受值一致。使用 LCM 制造的氧化锆制作的牙科修复体减少了 CAD/CAM 牙科中部分后处理工作流程的需求。
