Yuasa S
Department of Dental Engineering, Tsurumi University School of Dental Medicine.
Shika Zairyo Kikai. 1990 Jul;9(4):659-78.
The influences of the composition on abrasion resistance of composite resins were examined using various experimental composite resins which had various matrix resin, filler size and content. The abrasion test was conducted by the experimental toothbrush abrasion testing machine developed in our laboratory. Three series of heat-curing composite resins were tested. One series was made from a Bis-MPEPP or UDMA monomer, and a silica filler with an average particle size of 0.04, 1.9, 3.8, 4.3, 7.5, 13.8 and 14.1 microns. The filler content of this series was constant at 45 wt%. The second series contained a silica filler of 4.3 microns in a content ranging from 35 to 75 wt%. The third series contained a microfiller (0.04 microns) and macrofiller (4.3 microns) in total content of 45 wt%. In this series, the microfiller was gradually replaced by 5, 15, 25 and 45 wt% of the macrofiller. The results obtained for these three series indicated that the abrasion resistance of composite resins was controlled by the inorganic filler, mainly filler size and content. The abrasion loss did not vary with the difference of matrix resin. When the particle size of the filler was below about 5 microns, the abrasion resistance decreased markedly with the decrease in filler size. The composite resin which contained a 0.04 or 1.9 micron filler was less resistant to toothbrush wear than the unfilled matrix resin. However, the microfiller also contributed to abrasion resistance when used in combination with the macrofiller, although abrasion resistance decreased with the increase in the microfiller concentration. The increase of filler content clearly improved the abrasion resistance when used the macrofiller. The analysis of these results and SEM observations of the brushed surfaces of samples suggested that the toothbrush abrasion was three-body abrasion caused by the abrasive in the toothpaste, and affected by the difference in the particle size between abrasive and filler, and between the abrasive size and the interparticle distance of the filler.
使用具有不同基体树脂、填料尺寸和含量的各种实验性复合树脂，研究了其成分对复合树脂耐磨性的影响。磨损试验由我们实验室开发的实验性牙刷磨损试验机进行。测试了三个系列的热固化复合树脂。一个系列由双甲基丙烯酸聚亚苯基酯（Bis-MPEPP）或二甲基丙烯酸脲烷（UDMA）单体以及平均粒径为0.04、1.9、3.8、4.3、7.5、13.8和14.1微米的二氧化硅填料制成。该系列的填料含量恒定为45重量％。第二个系列包含粒径为4.3微米的二氧化硅填料，含量范围为35至75重量％。第三个系列包含总含量为45重量％的微填料（0.04微米）和宏填料（4.3微米）。在该系列中，微填料逐渐被5、15、25和45重量％的宏填料替代。这三个系列获得的结果表明，复合树脂的耐磨性由无机填料控制，主要是填料尺寸和含量。磨损损失不因基体树脂的差异而变化。当填料的粒径低于约5微米时，耐磨性随着填料尺寸的减小而显著降低。含有0.04或1.9微米填料的复合树脂比未填充的基体树脂更不耐牙刷磨损。然而，当与宏填料组合使用时，微填料也有助于提高耐磨性，尽管耐磨性随着微填料浓度的增加而降低。当使用宏填料时，填料含量的增加明显提高了耐磨性。对这些结果的分析以及对样品刷涂表面的扫描电子显微镜观察表明，牙刷磨损是由牙膏中的磨料引起的三体磨损，并受磨料与填料之间的粒径差异以及磨料尺寸与填料颗粒间距离差异的影响。
