Investigations on materials and antibacterial properties of dental porcelain with ZnO

• Main Authors: Chih-Yang Lin, 林志洋
• Other Authors: 楊永欽
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/875kxq

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 98 === The research chapter is divided into two parts： The first section of this research is focused on the doping of zinc oxide nanoparticles onto the surface of dental porcelain. Effects of various contents of zinc oxide, preheating and sintering temperature on the bacteria resistance of dental porcelain were studied. The interfacial interaction between zinc oxide and dental porcelain is also observed. The results showed that the antibacterial properties of dental porcelain were increased with the amounts of zinc oxide nanoparticle, but decreased under overhigh sintering temperature. The formation of Zn2SiO4 resulted from the reaction between zinc oxide and dental porcelain at high temperature lowers the concentration of zinc oxide in the sample, and thus results in the weak antibacterial ability. In the second section, the dental porcelain powders were mixed with 10%, 15%, 20%, and 25% modified zinc oxide nanoparticles then fired at 800℃, 850℃, 900℃, and 950℃ for each sample. The antibacterial properties of the specimens with different contents of modified zinc oxide and sintering temperatures are discussed. The experimental result reveals that the melting behavior of dental porcelain and the flowability at high temperature were influenced by the content of modified zinc oxide. The flowability of dental porcelain was decreased with the increasing zinc oxide content. But the effects of zinc oxide content and sintering temperature on the antibacterial property of dental porcelain show an opposite tendency when compared with its flowability. As the sintering temperature was increased, the surface of dental porcelain with nano ZnO was covered by the melting porcelain. In addition, the zinc oxide content of the sample was reduced as a result of the formation of Zn2SiO4. Both reduce the antibacterial ability of dental implant.