齿科珠状聚甲基丙烯酸甲酯的粒度分布对修复体微结构的影响  

Effect of particle size distribution of dental poly(methyl methacrylate)beads on the microstructure of denture

作　　者：杨斌[1] 王同[1] 徐恒昌[1] 

机构地区：[1]北京大学口腔医学院材料研究室,100081

出　　处：《中华口腔医学杂志》2003年第3期203-205,I003,共4页Chinese Journal of Stomatology

摘　　要：目的　研究齿科珠状聚甲基丙烯酸甲酯 (PMMA粉 )的粒度分布对修复体微结构的影响。方法　对比分析 3组粒度分布不同的PMMA粉 ,按适合粉 /液比制成的球形试块内气泡产生的情况 ,采用高分辨数码显微镜对固化后试样的微结构进行观察。结果　气泡产生程度随适合粉 /液比的增高呈降低趋势 ;PMMA粉因粒度分布不同 ,其粉液混合物固化后的微结构也存在差异。结论通过优化PMMA粉的粒度分布 ,可以改善修复体的微结构 。Objectives To investigate the effect of particle size distribution (PSD) of dental poly (methyl methacrylate) (PMMA) beads on the microstructure of denture Methods It was compared and analyzed that the porosity of three groups of spherical specimens which were made of PMMA beads with different PSD at proper polymer/monomer ratios And the final microstructure of each group was investigated using Digital High Definition Microscope Results With proper polymer/monomer ratio increasing, the occurrence of porosity tended to decrease The final microstructure of denture varied with PSD of PMMA beads Conclusion By means of optimizing PSD of beads, the microstructure of denture could be improved, and the occurrence of porosity could be reduced

关 键 词：齿科珠状聚甲基丙烯酸甲酯 粒度分布 修复体 微结构 牙科材料 

分 类 号：R783.1[医药卫生—口腔医学]