Mechanical Engineering, College of Science and Engineering, James Cook University, Townsville QLD 4811, Australia.
Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
J Mech Behav Biomed Mater. 2018 Apr;80:59-67. doi: 10.1016/j.jmbbm.2018.01.022.
This paper reports the use of micro-slurry jet erosion (MSJE) on CAD/CAM lithium mesilicate glass ceramic (LMGC) that is capable of achieving the fracture-free surface quality. A computer-controlled MSJE process using a low-pressure and low-concentration alumina slurry was applied to diamond-ground LMGC surfaces with surface and subsurface damage. The MSJE processed and diamond-ground LMGC surfaces were examined using scanning electron microscopy (SEM) to examine surface morphology, fractures, and residual defects. 3D confocal laser microscopy (CLM) was used to quantitatively characterize all machined surface textures as a function of processing conditions. Our results show that surface and subsurface damage induced in diamond-ground surfaces were significantly diminished after 50-cycle MSJE processing. Fracture-free surfaces were obtained after 100 MSJE cycles. Our measured parameters of the 3D surface topography included the average surface roughness, maximum peak-valley height, highest peak height, lowest valley height, and kurtosis and absolute skewness of height distributions. All these parameters were significantly reduced with the increase of MSJE cycles. This work implies that MSJE promises to be an effective manufacturing technique for the generation of fracture-free LMGC surfaces which are crucial for high-quality monolithic restorations made from the material.
本文报告了使用微泥浆射流侵蚀（MSJE）对 CAD/CAM 硅酸锂玻璃陶瓷（LMGC）的应用，该方法能够实现无裂纹的表面质量。采用低压、低浓度氧化铝泥浆的计算机控制 MSJE 工艺，对金刚石研磨后的 LMGC 表面进行处理，以去除表面和次表面损伤。使用扫描电子显微镜（SEM）对 MSJE 处理和金刚石研磨后的 LMGC 表面进行了检查，以检查表面形貌、裂缝和残留缺陷。三维共焦激光显微镜（CLM）用于定量表征所有加工表面纹理作为处理条件的函数。我们的结果表明，在经过 50 个循环的 MSJE 处理后，金刚石研磨表面产生的表面和次表面损伤明显减少。经过 100 个 MSJE 循环后，获得了无裂纹的表面。我们测量的 3D 表面形貌参数包括平均表面粗糙度、最大峰谷高度、最高峰值高度、最低谷深以及高度分布的峰度和绝对偏度。所有这些参数都随着 MSJE 循环次数的增加而显著降低。这项工作表明，MSJE 有望成为一种有效的制造技术，用于生成无裂纹的 LMGC 表面，这对于由该材料制成的高质量整体修复体至关重要。
