【摘要】 以二氧化硅(A组)、羟基磷灰石(B组)、镁掺杂羟基磷灰石(C组)分别以硅烷偶联剂(KH570)进行改性处理后作为无机填料;双酚-A-甲基丙烯酸缩水甘油酯(Bis-GMA)为树脂单体,二甲基丙烯酸三乙二醇酯(TEGDMA)为稀释剂,按6:4(质量比)比例混合组成树脂基质;樟脑醌(CQ)与叔胺(EMADMA)混合组成光引发体系;然后分别将树脂基体、无机填料、光引发体系混合均匀进行光固化处理,制备出实验用三种牙科修复复合树脂填充材料。采用SFT-2M销盘式摩擦磨损试验机对复合树脂进行摩擦磨损试验,扫描电子显微镜观察磨损表面形貌,HVS-1000数显显微硬度计测量复合树脂材料的硬度,研究填料种类及含量对牙科修复树脂复合材料耐磨性、硬度及磨损表面形貌的影响。实验结果表明:随着填料含量的增加,复合树脂的硬度增大,磨损量减小;填料含量为25 wt%和30 wt%的复合树脂的磨损量关系均为A>B>C,含量达到35 wt%时,磨损量关系为B>A>C;树脂复合材料主要以磨粒磨损为主,填料含量相同时,镁掺杂羟基磷灰石复合树脂的耐磨性及硬度优于其他填料的复合树脂材料;复合树脂的硬度和耐磨性呈非线性正比关系。更多还原

【Abstract】 Taken the silicon dioxide( group A),hydroxyapatite( group B) and magnesium doped hydroxyapatite( group C) as inorganic fillers that had been treated by Silane coupling agent( KH570),the bisphenol A-glycol methacrylate( Bis-GMA) was taken as the resin monomers,and the triethylene glycol dimethacrylate( TEGDMA) was taken as diluents,which blended the resin matrixes in accordance with the ratio 6: 4( mass ratio),the photo initiating system were composed by blending the camphor quinon( CQ) with dimethyl aminoethyl methacrylate( DMAEMA),then three kinds of dental restoration composition were prepared by means of homogeneous mixing the resin matrix with fillers and photo initiating system respectively,which were treated by light curing processing. Friction and wear experiment was carried out by the SFT-2 M pin disc friction-wear testing machine,and the morphology of wear surface were studied by SEM. The microhardness of the dental resin composites had been measured with HVS-1000 digital micro hardness tester. The paper dealt with the effects of the varieties and contents of inorganic filler on the wear resistance,hardness and the morphology of wear surface of dental resin composites. The experimental results showed that the hardness of composite resin would be increased and wearing capacity should be reduced with the increase of filler content. It also showed that wearing capacities of groups would be A > B > C,when the inorganic fillers were mixed with the resin matrix in proportions of 25 wt% and 30 wt%,but B > A > C when 35 wt%. The wearing mechanism of the resin composite would be mainly of abrasive wear. In the same filler content,the hardness and wear resistance of magnesium doped hydroxyapatite composite resin material was better than the other composite resin. The relationship between the hardness and wear resistance of composite resin was a nonlinear proportional.更多还原