| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 103 === Polymethyl methacrylate (PMMA) has been widely used for the fabrication in prosthodontic treatment. The most essential issues for denture materials are the mechanical properties and the formation of biofilm from microorganisms in oral. In this study, PMMA and silver nanowire (AgNWs) were mixed to manufacture composite resin. The experiment was designed by uniform design method and investigated the mechanical properties of composite resin. After the process, the hole coverage on surface was analyzed. Then, the change of surface hardness, roughness and color stability after restored in the 37℃ water were investigated. Moreover, the antimicrobial test was examined. The results showed that high hole rate, namely loose structure, caused poor surface roughness and mechanical properties. The hardness was analyzed under microscopic and macroscopic scale by using the MTS nanoindenter XP systems and micro Vickers tester, respectively. The factors, weighting of surface hardness were polymerization pressure &;gt; polymerization time &;gt; Aspect ratio &;gt; concentrations. The best conditions are polymerization pressure of 1.6 bar, polymerization time of 10 minutes, aspect ratio of 14, concentration of 0.5%. The hardness increased 1.7 to 2.4 times. The antibacterial experiments showed the solid composite resin had poor antimicrobial performance. However, the PMMA mixed with AgNWs had impact on E.coli. To sum up, composite resin mixed with AgNWs had better mechanical strength and inhibitory effect on E.coli.
|
|---|
