Development of Rubber-bonded Diamond Polishing Tool for Dental Ceramics

近年来，为了满足冠修复的审美需求，各种牙体材料被开发出来，用于嵌体或冠。其中，牙瓷在满足审美、控制腐蚀、耐磨损等方面都是高效的，在生物相容性方面更是高效的。在冠修复体的制作过程中，抛光是一个非常重要的过程，既要满足生理卫生要求，又要满足审美要求。硬脆材料如陶瓷一般为人所知，其表面完整性可能会影响其强度。关于牙科陶瓷也有类似的报道。牙瓷是一种硬脆材料，是牙科陶瓷的一部分。由于抛光技术对提高其平面精度具有重要意义，也由于其强度的不断提高，因此迫切需要发展其技术。顺便说一下，目前多晶金刚石主要作为松散磨粒使用，对高硬度陶瓷等难加工材料的高精度加工效率高。因此，本研究将未作为粘结磨料使用的聚晶金刚石作为牙用砂轮的开发新途径。这个轮子与单晶金刚石进行了比较，单晶金刚石通常被用作粘结磨料。在轮毂方面，为了临床器具的目的，开发了橡胶结合金刚石轮毂，抛光牙瓷。本研究的目的是获得牙瓷的光面与釉面相当的表面，以适应临床器具的使用。

Recently, as the demand for aesthetic satisfaction in crown restoration, various dental materials are developed, which are applied to inlay or crown. Among them, dental porcelain is efficient in terms of aesthetic satisfaction, corrosion control, and withstanding wearing, and also especially efficient at biocompatibility. Finishing polish at making process of crown restorations is a very significant process in order to meet physiological and hygienical requirement, as well as for aesthetic satisfaction. Hard brittle materials such as ceramics are generally known that its surface integrity may affect its strength. There are similar reports referring to the dental ceramics. Dental porcelain which is a part of dental ceramics is a hard brittle material. Since polishing technology is important for enhancing its accuracy of flatness, also because of its increasing strength, development of its technology is urgently required. By the way, currently, poly-crystalline diamond which is efficient at high-precision machining of difficult machining materials such as high hardness ceramics is mainly used as loose abrasive grain. Therefore, in this study, as a new approach to development of wheels for dental technique, poly-crystalline diamond which has not been used as bonded abrasive is used. And this wheel was weighed against mono-crystalline diamond which is conventionally used as bonded abrasive. Regarding wheels, for the purpose of clinical appliance, rubber bonded diamond wheels is developed, and polish dental porcelain. The purpose of this study is to obtain the glossy surface equal to glazed surface of dental porcelain which is conventionally adapted to clinical appliances.