3种新型复合树脂材料耐磨性及硬度的体外研究

An in vitro investigation of wear resistance and hardness of three kinds of new composite resins

目的评价3种新型复合树脂材料的耐磨性及硬度。方法选取Solidex、Spectrum、FiltekTM Z350新型复合树脂材料为研究对象,对照组为釉质。在改装的MG-200型摩擦磨损实验机上进行磨损实验。扫描电镜观察摩擦表面形貌。用维氏硬度仪测量4种样本的维氏硬度。用秩和检验和单因素方差分析对磨损量和硬度值进行统计分析。通过直线回归分析的方法来分析3种复合树脂磨损量与硬度的相关性。结果3种复合树脂材料中,FiltekTM Z350显示了最低的磨损量和最高的维氏硬度(P<0.05)。Solidex与Spectrum的磨损量和硬度无显著性差异(P>0.05)。3种复合树脂材料的磨损量与硬度间存在显著的相关性(r=-0.9686)(P<0.05)。扫描电镜下各材料的摩擦表面形貌显示了不同的磨损特征。结论纳米填料复合树脂的耐磨性及硬度优于混合填料复合树脂。

Objective To evaluate wear resistance and hardness of three kinds of new composite resins. Methods Three kinds of new composite resins, Solidex, Spectrum, Filtek^TM Z350, were tested. Enamel as control group. A refited MG-200 wear machine was used in this study. Scanning electron microscope （SEM） was used to observe the friction surface of each tested material. Hardness of each tested material was determined by Vickers indentation technique. The data of wear and hardness were analyzed by Mann-Whitney test and 1-way ANOVA. The relationship between the hardness of the composites and the amount of wear of them was determined by a regression analysis method. Results Filtek^TM Z350 showed the lowest volumetric wear and highest Vickers hardness in the composites （P〈0.05）. No significant differences in wear and hardness were observed between Solidex and Spectrum （P〉0.05）. Significant relationships were observed between the hardness of the composites and the amount of wear of them （r=-0.968 6）（P〈0.05）. Different wear characters of the friction surface of the tested materials were observed by SEM. Conclusion Nanofilled composite was superior to the hybrid composite in wear resistance and hardness.