Callaghan David J, Vaziri Ashkan, Nayeb-Hashemi Hamid
Department of Mechanical, Industrial and Manufacturing Engineering, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Dent Mater. 2006 Jan;22(1):84-93. doi: 10.1016/j.dental.2005.02.011. Epub 2005 Jul 5.
The main objective of this study was to evaluate the wear characteristics of fiber-reinforced dental composites. Variables under investigation include the fiber weight percent added to the matrix as well as fiber length.
Dental specimens with glass fiber content of 2, 5.1, 5.7, and 7.6 wt% with fiber length of either 1.5 or 3 mm, were prepared by mixing an activated dental resin with commercial glass fibers. The specimens were then tested on a pin on disc setup, where the antagonist disc was manufactured of a similar fiber-reinforced composite with 5.1 wt% fiber and fiber length of 3 mm. The volume loss and coefficient of friction of the specimens was monitored periodically throughout testing. In addition, the wear surfaces of all specimens were evaluated using a scanning electron microscope.
The specimens with 5.7 wt% fibers and fiber length of 3 mm performed better in this study compared to all other fiber-reinforced specimens under all load conditions. In fact, this specimen had a comparable wear rate to a particle-filled dental composite. For the fiber lengths considered, increasing the length of the fibers increased the wear resistance of the specimen. The coefficient of friction showed a good correlation with the wear resistance of specimens.
Fiber-reinforced composites demonstrated a high resistance to wear and may therefore be advantageous for dental applications, where high wear resistance is essential to functionality.
本研究的主要目的是评估纤维增强牙科复合材料的磨损特性。研究的变量包括添加到基体中的纤维重量百分比以及纤维长度。
通过将活性牙科树脂与商用玻璃纤维混合，制备玻璃纤维含量分别为2%、5.1%、5.7%和7.6 wt%且纤维长度为1.5或3 mm的牙科标本。然后在销盘装置上对标本进行测试，其中对磨盘由纤维含量为5.1 wt%且纤维长度为3 mm的类似纤维增强复合材料制成。在整个测试过程中定期监测标本的体积损失和摩擦系数。此外，使用扫描电子显微镜评估所有标本的磨损表面。
在本研究中，纤维含量为5.7 wt%且纤维长度为3 mm的标本在所有载荷条件下比所有其他纤维增强标本表现更好。事实上，该标本的磨损率与颗粒填充牙科复合材料相当。对于所考虑的纤维长度，增加纤维长度可提高标本的耐磨性。摩擦系数与标本的耐磨性显示出良好的相关性。
纤维增强复合材料表现出高耐磨性，因此对于牙科应用可能具有优势，在牙科应用中高耐磨性对功能至关重要。
