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首页> 外文期刊>Biomaterials >Water absorption characteristics of dental composites incorporating hydroxyapatite filler.
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Water absorption characteristics of dental composites incorporating hydroxyapatite filler.

机译：掺入羟基磷灰石填料的牙科复合材料的吸水特性。

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Water uptake characteristics of BisGMA-based composites incorporating untreated and surface-treated hydroxyapatite (HA) with a silane coupling agent have been investigated. The water absorption and desorption behaviour of these composites obeyed the classical diffusion theory. The diffusion coefficients of the composites during first absorption were very similar to that for the base resin, suggesting that the water uptake process occur mainly in the resin matrix. The incorporation of HA reduced the water uptake of the base resin and lower uptake was found for those formulated with surface-treated HA. It was also observed that the equilibrium uptake decreased with increasing filler loading. However, the filled specimens had a higher water absorption than which would be expected on the basis of the resin content. This increase in the water uptake was largely due to the presence of porosity and filler particle aggregates in the microstructure of composites, although the adsorption of some water onto the filler surface has not been ruled out. The experimental composites showed higher solubilities than that obtained for the base resin.
机译：研究了结合了未处理的和表面处理的羟基磷灰石（HA）和硅烷偶联剂的BisGMA基复合材料的吸水特性。这些复合材料的吸水和解吸行为遵循经典的扩散理论。复合材料在第一次吸收过程中的扩散系数与基础树脂非常相似，这表明吸水过程主要发生在树脂基体中。 HA的掺入减少了基础树脂的吸水率，并且发现那些经表面处理的HA配制的吸水剂的吸水率较低。还观察到，平衡吸收随着填料负载的增加而降低。然而，填充的样品的吸水率高于根据树脂含量所预期的吸水率。吸水量的增加主要是由于复合材料的微观结构中存在孔隙和填料颗粒聚集体，尽管还没有排除一些水在填料表面的吸附。实验的复合材料显示出比基础树脂更高的溶解度。

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