Nakamura Yoshiharu, Sato Hideaki, Ohtsuka Masaki, Hojo Satoru
Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Biomed Mater Eng. 2010;20(5):283-93. doi: 10.3233/BME-2010-0642.
Polycrystalline diamond (PCD) exhibits excellent abrasive characteristics and is commonly used as loose grains for precision machining of hard ceramics and other materials that are difficult to grind and polish. In the present study, we investigated using bonded PCD for polishing dental porcelain, for which a lustrous surface is difficult to obtain by polishing. We compared the surface texture and characteristics of dental porcelain after polishing with bonded PCD with that obtained using bonded monocrystalline diamond (MCD), which is commonly used for this purpose. Polishing was performed at various pressures and rotational speeds on a custom-built polishing apparatus using bonded PCD or MCD with grain sizes of 3.92 μm on specimens consisting of VITA Omega 900 dentin porcelain after firing and then glazing to a specified surface roughness. The surface roughness of the polished porcelain and the abrasion quantity in terms of its polishing depth were measured, and its surface texture and characteristics were investigated. At low polishing pressures, PCD yielded a finer polished surface than MCD. The polishing depth after polishing for 20-30 min was approximately 2-3 μm with PCD and 1-2 μm with MCD. The polished surface was more uniform and smooth with PCD than with MCD.
聚晶金刚石（PCD）具有优异的研磨特性，通常用作松散颗粒，用于精密加工硬陶瓷和其他难以磨削和抛光的材料。在本研究中，我们研究了使用粘结PCD来抛光牙科陶瓷，这种材料通过抛光很难获得有光泽的表面。我们将粘结PCD抛光后的牙科陶瓷的表面纹理和特性与使用粘结单晶金刚石（MCD）抛光后的进行了比较，MCD通常用于此目的。在定制的抛光设备上，使用粒度为3.92μm的粘结PCD或MCD，在不同压力和转速下对由VITA Omega 900牙本质瓷烧制后再上釉至指定表面粗糙度的试样进行抛光。测量了抛光后陶瓷的表面粗糙度及其抛光深度方面的磨损量，并研究了其表面纹理和特性。在低抛光压力下，PCD产生的抛光表面比MCD更精细。用PCD抛光20 - 30分钟后的抛光深度约为2 - 3μm，用MCD为1 - 2μm。与MCD相比，PCD抛光后的表面更均匀、光滑。
