含海胆状羟基磷灰石的牙科树脂/复合材料的力学性能
Mechanical properties of dental resin/composite containing urchin-like hydroxyapatite.
作者信息
Liu Fengwei, Sun Bin, Jiang Xiaoze, Aldeyab Sultan S, Zhang Qinghong, Zhu Meifang
机构信息
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, 201620, PR China.
出版信息
Dent Mater. 2014 Dec;30(12):1358-68. doi: 10.1016/j.dental.2014.10.003.
OBJECTIVES
To investigate the reinforcing effect of urchin-like hydroxyapatite (UHA) in bisphenol A glycidyl methacrylate (Bis-GMA)/triethylene glycol dimethacrylate (TEGDMA) dental resin (without silica nanoparticles) and dental composites (with silica nanoparticles), and explore the effect of HA filler morphologies and loadings on the mechanical properties.
METHODS
UHA was synthesized by a facile method of microwave irradiation and studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TGA). Mechanical properties of the dental resin composites containing silanized UHA were tested by a universal mechanical testing machine. Analysis of variance was used for the statistical analysis of the acquired data. The fracture morphologies of tested composites were observed by SEM. Composites with silanized irregular particulate hydroxyapatite (IPHA) and hydroxyapatite whisker (HW) were prepared for comparative studies.
RESULTS
Impregnation of lower loadings (5 wt% and 10 wt%) of silanized UHA into dental resin (without silica nanoparticles) substantially improved the mechanical properties; higher UHA loadings (20 wt% and 30 wt%) of impregnation continuously improved the flexural modulus and microhardness, while the strength would no longer be increased. Compared with silanized IPHA and HW, silanized UHA consisting of rods extending radially from center were embedded into the matrix closely and well dispersed in the composite, increasing filler-matrix interfacial contact area and combination. At higher filler loadings, UHA interlaced together tightly without affecting the mobility of monomer inside, which might bear higher loads during fracture of the composite, leading to higher strengths than those of dental resins with IPHA and HW. Besides, impregnation of silanized UHA into dental composites (with silica nanoparticles) significantly improved the strength and modulus.
SIGNIFICANCE
UHA could serve as novel reinforcing HA filler to improve the mechanical properties of dental resin and dental composite.
目的
研究海胆状羟基磷灰石（UHA）对甲基丙烯酸缩水甘油酯（Bis-GMA）/二甲基丙烯酸三乙二醇酯（TEGDMA）牙科树脂（不含二氧化硅纳米颗粒）和牙科复合材料（含二氧化硅纳米颗粒）的增强效果，并探讨羟基磷灰石（HA）填料形态和含量对力学性能的影响。
方法
采用微波辐射简便方法合成UHA，并通过X射线衍射（XRD）、扫描电子显微镜（SEM）和热重分析（TGA）进行研究。使用万能机械试验机测试含硅烷化UHA的牙科树脂复合材料的力学性能。采用方差分析对所得数据进行统计分析。通过SEM观察测试复合材料的断裂形态。制备含硅烷化不规则颗粒羟基磷灰石（IPHA）和羟基磷灰石晶须（HW）的复合材料进行对比研究。
结果
将较低含量（5 wt%和10 wt%）的硅烷化UHA浸渍到牙科树脂（不含二氧化硅纳米颗粒）中可显著改善力学性能；较高含量（20 wt%和30 wt%）的UHA浸渍可持续提高弯曲模量和显微硬度，而强度不再增加。与硅烷化IPHA和HW相比，由从中心径向延伸的棒组成的硅烷化UHA紧密嵌入基体并在复合材料中良好分散，增加了填料-基体界面接触面积和结合力。在较高填料含量下，UHA紧密交织在一起而不影响内部单体的流动性，这可能使复合材料在断裂过程中承受更高载荷，从而导致强度高于含IPHA和HW的牙科树脂。此外，将硅烷化UHA浸渍到牙科复合材料（含二氧化硅纳米颗粒）中可显著提高强度和模量。
意义
UHA可作为新型增强HA填料，改善牙科树脂和牙科复合材料的力学性能。
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