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Study of metal-resin composite for posterior application

后部金属树脂复合材料的研究

基本信息

批准号：
10045077
负责人：
OGURA Hideo
金额：
$ 2.88万
依托单位：
The Nippon Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

For dental restorative applications, metal-resin composites were experimentally prepared using silver-tin and silver-indium alloy particles as filler. The mechanical properties (flexural strength and modulus of elasticity), biological properties (cytotoxicity and untimicrobial property), chemical property (corrosion resistance) and wear resistance of the experimentally developed materials were evaluated. The highest flexural strength of the developed metal-resin composites was 91.8 MPa for the Ag-Sn filled composite and 91.0 MPa for Ag-In filled conaposite. The flexural strength of these materials deceased when they were immersed in water for a long time or subjected to thermal cycling, but the rate of the decrease was similar to those of commercially available posterior composite resins. Although the flexural strength of the metal-resin composites was close to conventional composite resitas, it was not competitive to posterior composites. Therefore, a further study is necessary to improve the strengh. The cytotoxicity of the metal-resin composites was similar or less than that of dental amalgam within one month after the setting. Before setting, untimicrobial effect was found on these materials, but disappeared after setting. The experimental composites showed little electric conductivity indicating its electrochemical stability. The rate of tarnish in corrosive solution was lower than that of dental amalgam which showed remarkable tarnish. Wear resistance tests showed that the resin matrix of the metal-resin composite was lost, but the filler particles remained on the surface maintaining their polished surface, indicating relatively high wear resistance.

以银锡和银铟合金颗粒为填料，实验制备了牙科修复用金属-树脂复合材料。对材料的力学性能(弯曲强度和弹性模数)、生物性能(细胞毒性和非微生物性能)、化学性能(耐腐蚀性)和耐磨性进行了评价。所研制的金属-树脂复合材料的最高弯曲强度分别为91.8 Mpa和91.0 Mpa。这些材料在水中长时间浸泡或经历热循环后，弯曲强度下降，但下降的速度与商用后牙复合树脂相似。虽然金属-树脂复合材料的弯曲强度接近传统树脂树脂，但不能与后牙复合材料竞争。因此，有必要进行进一步的研究，以提高强度。在固化后1个月内，金属树脂复合体的细胞毒性与银汞合金相近或更小。固化前这些材料均有抑菌作用，固化后无抑菌作用。实验材料的导电性很小，表明其电化学稳定性较好。腐蚀液中的变色率低于银汞合金的变色率，银汞合金变色明显。耐磨性测试表明，金属-树脂复合材料的树脂基体脱落，但表面仍保留有填料颗粒，保持了其抛光表面的光洁度，表明其耐磨性较高。