牙科瓷添加奈米氧化鋅之材料特性與抗菌性質探討

Investigations on materials and antibacterial properties of dental porcelain with ZnO

林志洋(Chih-Yang Lin)

指導教授 ： 楊永欽

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00244

摘要

本研究主要分為兩個部分：
第一部分主要是以市售之牙科瓷表材吸附奈米氧化鋅粉體，藉由不同燒瓷預熱、燒結溫度等製程參數之改變，探討氧化鋅的添加量對牙科表瓷其抗菌能力之表現，以及氧化鋅層與牙科瓷層之界面反應。實驗結果顯示，在相同燒結條件下，氧化鋅含量增加，試片之抗菌能力亦隨之提升，但是當燒結溫度過高時，反而降低其抗菌能力。奈米氧化鋅粉體與牙科瓷粉在高溫下產生化學反應，形成Zn2SiO4，此化學反應使得奈米氧化鋅在試片中含量減少，牙科瓷之抗菌能力亦隨之降低。
第二部分，則是將不同比例之改質氧化鋅粉體直接添加於牙科瓷粉中，分別以不同溫度進行燒結，探討不同改質氧化鋅的含量、不同燒結溫度下對氧化鋅/牙科瓷試片性質及抗菌能力之影響。實驗結果顯示，添加改質氧化鋅於牙科瓷粉中，會影響瓷粉熔融軟化及流動分佈的情形，隨著氧化鋅含量增加而使牙科瓷流動性下降，但隨著燒結溫度的提升，可改善牙科瓷表面之流動性。隨著改質氧化鋅含量提高，試片之抗菌效果越明顯。試片的抗菌能力會隨燒結溫度提高而下降，其原因為表面氧化鋅成分被熔融牙科瓷層覆蓋所致，同時高溫下氧化鋅會與牙科瓷中的二氧化矽反應生成矽酸鋅，使得氧化鋅在試片中含量減少，試片之抗菌性亦隨之降低。
綜合以上實驗結果顯示，試片表面的氧化鋅粉體被熔融牙科瓷層覆蓋及Zn2SiO4的生成，為影響試片抗菌性之主要原因。

關鍵字

奈米氧化鋅 ； 牙科瓷 ； 抗菌性

並列摘要

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.

並列關鍵字

Nano-ZnO ； Porcelain ； Antibacterial

參考文獻

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