|
Objective: The main purpose of this study is that the nanoparticles dispersed polymethyl methacrylate monomers, explore the denture artificial tooth abrasion resistance a way to improve the effective way to provide a theoretical basis for the research and development of new denture materials and reference. Method: 1. The use of hand-mixed, machine mixing the (intermittent machine mixing or continuous mixing machine), SiO 2 or CaCO 3 nanoparticles dispersed in methyl methacrylate monomer After the particle dispersion was observed in the industrial microscope, and analyzed statistically to compare several dispersion method. 2. Intermittent machine mixed in a methyl methacrylate monomer were added to different concentrations of nano an SiO 2 particles and the S the nano of CaCO 3 particles, and the resulting suspension was The polymerization was carried out by a certain percentage with methyl methacrylate powder, made of a variety of standard test pieces and their mechanical properties were tested, including the specimen hardness, abrasion resistance, tensile strength, bending strength, etc.. Then the data will be grouped summary data for statistical analysis, this summary and statistical analysis of the results based on related literature are discussed. Results: 1. 2 / PMMA monomers three dispersions prepared by the method of nano an SiO visual particle diameter of 200nm or more, the flexural strength of the composite material through the SiO 2 / PMMA nano and tensile strength of the statistical analysis, the dispersion effect of the three methods was no significant difference (P> 0.05). 2. The low content nano-SiO 2 / PMMA with nano CaCO , 3 / PMMA composite performance changes in hardness, friction, wear two groups showed no significant difference (P> 0.05 ). Within the group of the same additives significant difference (P <0.05), and nano-SiO 2 / PMMA composite content of 0.25% hardness value with blank control group no significant difference (P> 0.05 ), as the content increases, the changing value incremental content of 0.75%, 1%, 2%, 3%, 4%, compared to its performance with the blank control group showed a significant difference (P <0.05), nano-SiO 2 content peaked at 3%, followed by decreased; abrasion value of the friction in the nano-particle content of 0.25%, 0.5%, with the blank control group, no significant difference (P> 0.05), in the amount of 0.75%, 1%, 2%, 3%, 4%, with blank control group phase of Tianjin Medical Shuo Bu state} postgraduate degree righteous than there were significant differences (P lt; 0.05) , nano-particles content continues to increase, friction mushroom consumption value in the nano-510: content to 3% after reaching a peak decline; nano-CaCO3 / P MMA composite materials in the content of 0.25% hardness value with blank control group without significantly with sex differences ( P gt; 0.05), as the content increases, the changing value increasing the concentration of 0.5%, 0.75%, 1%, and its performance as compared with the blank control group there was significant difference (P LT; 0.05); the friction nano-particles content of 0.25%, the abrasion value with blank control group without significantly significant difference (P GT; 0.05), in the content to 0.5%, 0.75%, 1%, its properties and empty from the control group compared to have significantly significant difference (P lt; 0.05). 3 adds CaCO: nanoparticles of poly methyl methacrylate Cool nano composite material with the blank control group compared to the flexural strength in the nano-particle content of 0.25% was no significant difference (P GT; 0.05), 0.5% increased 0.75%, 1% the content group flexural strength than the blank control group showed a significant difference (P LT; 0 .05); while the tensile strength in the nano-particle content of 0.25%, 0.5%, and the blank control group no significant difference (P gt; 0.05), 0.75% and 1% levels were bending strength than the control group increased, showed a significant difference (P lt; 0.05). Conclusion: hand mixing method and machine mixing method can be used as methyl methacrylate the cool monomer dispersed particles of nano 5102, but the reunion of the nanoparticles to be further explored. 2 add 510: CaCO: nano-particles were obtained denture can artificial teeth of the increased hardness and reduce friction wear of composite material; in polymethyl methacrylate cool monomer high content Nano 5102 MMA Composite found that, with the addition of increasing concentrations of hard steam gradually increased, reaching a peak and then decreases friction reduced wear presented an upturn. 3. In polymethyl methacrylate Cool monomer, add CaCO: nanoparticles enables the resulting composite material in the bending strength and the tensile strength is improved.
|