聚甲基丙烯酸甲酯-氧化锆复合材料的制备

The Preparation of PMMA-Zirconia Composites

将氧化锆纳米粉体冷等静压成型,经部分烧结制备成具有多孔网状结构的部分烧结体,然后经真空浸渍,将预聚甲基丙烯酸甲酯渗透入部分烧结体的开孔中,原位聚合,制备出聚甲基丙烯酸甲酯-氧化锆有机-无机复合材料.结果表明:预聚甲基丙烯酸甲酯经真空浸渍能完全浸入部分烧结陶瓷的开孔中并固化.当部分烧结体相对密度为63%～82%时,复合材料的弯曲强度为154～287MPa、断裂韧性为3.68～4.81MPa·m1/2;与部分烧结体比较,有明显提高.该复合材料经牙科CAD/CAM系统切削加工,可制作牙科修复体.

Partially sintered zirconia ceramics （PSZC） were prepared via isostatic pressing and partially sintering, with zirconia nanopowder as the raw materials. PMMA-Zirconia organic-inorganic composites were prepared by vacuum infiltration of the prepolymerized MMA into the PSZC, followed by in-sire polymerization. The results show that prepolymerized MMA immerged fully into the open pore of PSZC and polymerized. When the relative density of PSZC is within the range of 63% - 82%, the composites have a three-point bending strength of 154- 287MPa, fracture toughness of 3.68 - 4.81MPa·m^1/2, which are much higher than tho-e of PSZC. The composites can be machined by dental CAD/CAM system to manufacture dental restoration.