3种义齿基托材料抛光后表面粗糙度的比较研究

目的研究3种义齿基托材料抛光前后的表面粗糙度度。方法选择聚甲基丙烯酸基托树脂（PMMA）、弹性义齿材料和不碎胶等3种义齿基托材料，将材料制成12mm×12mm×2mm的标准试件，每种材料各20个，对试件进行打磨和抛光后，采用表面轮廓测量仪检测材料抛光前后的表面粗糙度，通过扫描电镜对材料表面形貌进行表面观察。结果PMMA、弹性义齿材料和不碎胶抛光后表面粗糙度分别为（0．160±0．018）μm、（0．110±0．011）μm和（0．141±0．017）μ。弹性义齿材料和不碎胶的表面粗糙度低于PMMA（P〈0．05），表面划痕也少于PMMA。结论弹性义齿材料和不碎胶更能获得抛光效果，表面粗糙度优于PMMA。

A comparative study of surface roughness of three denture base resins after polishing

Objective The aim of this study was to investigate the surface roughness of three different denture base resins before and after polishing. Methods Heat-polymerized poly（methyl methacrylate） （PMMA） denture resin, Valplast flexible denture resin and Lucitone 199 denture resin were selected for the investigation. 20 samples with dimensions of 12 mm× 12 mm ×2 mm were prepared from each material and polished using the conventional technique. The surface roughness of the sample before and after polishing was measured by a profilometer and the surface topography was observed by the scanning electron microscope （SEM）. Results The surface roughness of heat-polymerized PMMA, valplast flexible denture resin and lucitone 199 denture resin after polishing were （0.160±0.018）μ m, （0.110±0.011）μ m and （0.141 ±0.017）μ m respectively. The surface roughness and surface scratch of lucitone 199 denture resin and valplast flexible denture resin were lower than that of heat-polymerized PMMA （P〈0.05）. Conclusion Lucitone 199 denture resin and valplast flexible denture resin were far easier to obtain the polishing effect than heat-polymerized PMMA, and their the surface roughness was superior to that of heat-polymerized PMMA.