Toughening of composite resins by elastic fillers.

通过弹性填料增韧复合树脂。

基本信息

批准号：
04454470
负责人：
TORII Mitsuo
金额：
$ 4.22万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04454470/
关键词：
Composite resin Fiber reinforcement Elastic filler Milled fiber 不連続繊維分散強化

项目摘要

Composite resins have improved their mechanical properties by increasing the filler contenst. Consequently filler content exceeds 85 wt% and the mechanical properties of composite resins almost equal to that of amalgam. On the other hand, the brittleness of composite resins becomes very high. For that reason, the problems such as marginal fracture and wear remain unsolved. The purpose of this study is to make composite resin tough by adding elastic fillers. We used milled E-glass fiber for the elastic filler. Control composite resin contained 80 wt% of silica filler. From 0 to 65 wt% of silica filler was changed with milled fiber. The compressive strength decreased as milled fiber content increased. However, flexural strength, elastic modulus and fracture toughness increased as milled fiber content increased. The more the aspect ratio of millled fiber was, the more notable the increase in these three properties was. Especially, the fracture toughness became 1.7 times bigger than control resin when 65 wt% of milled fiber, whose aspect ratio was 25, was added. Resistance to marginal fracture also increased as milled fiber content increased. However, this resistance became minimum when 50 wt% of milled fiber was added and more addition of milled fiber caused decreased of resistance to marginal fracture. The surface roughness of milled fiber containing composite resins after polishing or wear test agaist bovine enamel was not significantly different from a comercial posterior composite resin.These results suggest that addition of milled fiber is very effective on toughening of composite resins and causes the increase in resistance to marginal fracture.

复合树脂通过增加填充物的浓度提高了机械性能。因此，填充物含量超过85 wt％，复合树脂的机械性能几乎等于汞合金。另一方面，复合树脂的脆性变得很高。因此，诸如边缘断裂和磨损之类的问题仍未解决。这项研究的目的是通过添加弹性填充剂来使复合树脂坚硬。我们将铣削的E玻璃纤维用于弹性填充剂。对照复合树脂含有80 wt％的二氧化硅填充剂。用磨纤维从0到65 wt％的二氧化硅填充剂更换。随着铣化纤维含量的增加，抗压强度降低。然而，随着铣削纤维含量的增加，弯曲强度，弹性模量和断裂韧性增加。铣削纤维的长宽比越多，这三个特性的增加就越明显。尤其是，当增加了65 wt的纤维（其纵横比为25）时，裂缝韧性比对照树脂大1.7倍。随着铣削纤维含量的增加，对边缘骨折的抗性也会增加。但是，当增加50 wt％的磨纤维时，这种耐药性变得最小，并且更多添加的铣化纤维会降低对边缘骨折的耐药性。抛光或磨损试验式脂肪的脂肪搪瓷后，铣削纤维含有复合树脂的表面粗糙度与商业后的复合树脂没有显着差异。这些结果表明，这些结果对复合树脂的加强非常有效，并且会导致对大小骨架的耐药性的增加。