Water absorption characteristics of dental composites incorporating hydroxyapatite filler
Water absorption characteristics of dental composites incorporating hydroxyapatite filler
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DOI：
10.1016/s0142-9612(01)00331-3
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发表时间：
2002-04-01
期刊：
影响因子：
14
通讯作者：
Davy, KWM
中科院分区：
文献类型：
--
作者：
Santos, C;Clarke, RL;Davy, KWM
研究了羟基磷灰石（HA）经硅烷偶联剂处理和未处理后的BisGMA基复合材料的吸水特性。复合材料的吸水和脱附行为符合经典扩散理论。复合材料在第一次吸水过程中的扩散系数与基体树脂非常相似，表明吸水过程主要发生在树脂基体中。HA的掺入降低了基础树脂的吸水率，并且发现那些用表面处理的HA配制的吸水率较低。还观察到，平衡吸收随着填料加载量的增加而降低。然而，填充的样品具有比基于树脂含量预期的更高的吸水性。这种吸水率的增加主要是由于复合材料的微观结构中存在的孔隙率和填料颗粒聚集体，尽管一些水吸附到填料表面上尚未被排除，实验复合材料显示出比基础树脂获得的更高的溶解度。(C)2002爱思唯尔科技有限公司。保留所有权利。
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. (C) 2002 Elsevier Science Ltd. All rights reserved.