BACKGROUND Ceramic crown that fires the layering porcelain on zirconia corping is starting to be used due to aesthetic requirements. However, many ceramics are used, but wear characteristics are often unknown. OBJECTIVE This study was performed to investigate the wear of human enamel by porcelains, and to determine the influence of porcelain hardness, surface roughness and crystal of porcelain on the enamel wear. METHODS Enamel specimens were prepared from extracted human molar teeth. Porcelain specimens were prepared from Deguceram Gold, Vita Omega 900, and Cercon Ceram Kiss. Enamel wear volume was calculated and the porcelain wear depth, surface roughness and Vickers hardness was measured. Moreover, the observation of a crystal by scanning electron microscope and the crystal by X-ray diffraction were identified. RESULTS Omega 900 showed the smallest enamel wear volume and porcelain wear depth. The Vickers hardnesses of Omega 900 and Cercon Ceram Kiss were almost identical. Leucite was detected from Deguceram Gold and Omega 900, and Silica and Silicon Nitride were detected from Cercon Ceram Kiss. CONCLUSIONS The enamel wear is influenced not by the hardness of the porcelain but by the surface roughness, the size and shape of the crystal.

中文翻译：

---

牙科瓷器对人类牙釉质磨损的体外研究。

背景技术出于美学要求，开始使用在氧化锆封盖上烧制分层瓷的陶瓷冠。然而，使用了许多陶瓷，但是磨损特性通常是未知的。目的进行此项研究以研究瓷质对人牙釉质的磨损，并确定瓷质硬度，表面粗糙度和瓷晶对瓷质磨损的影响。方法从提取的人类磨牙制备牙釉质标本。从Deguceram Gold，Vita Omega 900和Cercon Ceram Kiss制备瓷标本。计算瓷釉的磨损量，并测量瓷的磨损深度，表面粗糙度和维氏硬度。此外，鉴定出通过扫描电子显微镜观察晶体和通过X射线衍射观察晶体。结果Omega 900的瓷釉磨损量和瓷器磨损深度最小。欧米茄900和Cercon Ceram Kiss的维氏硬度几乎相同。从Deguceram Gold和Omega 900中检出了白沸石，从Cercon Ceram Kiss中检出了二氧化硅和氮化硅。结论搪瓷的磨损不受瓷器硬度的影响，但受表面粗糙度，晶体尺寸和形状的影响。