Hulterström Anna Karin, Berglund Anders, Ruyter I Eystein
NIOM-Scandinavian Institute of Dental Materials, P.O. Box 70, Haslum 1305, Norway.
J Mater Sci Mater Med. 2008 Jan;19(1):225-31. doi: 10.1007/s10856-006-0027-8. Epub 2007 Jun 28.
The wettability, water sorption and solubility of silicone elastomers used for maxillofacial prostheses were studied. The hypothesis was, that a material that has absorbed water would show an increase in the wettability and thus also the surface free energy of the material. Seven silicone elastomers, both addition- and condensation type polymers, were included. Five specimens of each material were subjected to treatment according to ISO standards 1567:1999 and 10477: 2004 for water sorption and solubility. The volumes of the specimens were measured according to Archimedes principle. The contact angle was measured with a contact angle goniometer at various stages of the sorption/solubility test. Wettability changed over the test period, but not according to theory. The addition type silicones showed little or no sorption and solubility, but two of the condensation type polymers tested had a significant sorption and solubility. This study showed that condensation type polymers may show too large volumetric changes when exposed to fluids, and therefore should no longer be used in prosthetic devices. The results of this study also suggests that it might be of interest to test sorption and solubility of materials that are to be implanted, since most of the materials had some solubility.
研究了用于颌面修复体的硅橡胶的润湿性、吸水性和溶解性。假设是，吸收了水分的材料会表现出润湿性增加，进而材料的表面自由能也会增加。研究包括七种硅橡胶，既有加成型聚合物，也有缩合型聚合物。每种材料的五个样本按照ISO标准1567:1999和10477:2004进行吸水性和溶解性处理。样本的体积根据阿基米德原理进行测量。在吸附/溶解试验的不同阶段，用接触角测量仪测量接触角。在试验期间润湿性发生了变化，但不符合理论。加成型硅橡胶几乎没有或没有吸水性和溶解性，但测试的两种缩合型聚合物有显著的吸水性和溶解性。这项研究表明，缩合型聚合物在接触液体时可能会出现过大的体积变化，因此不应再用于修复装置。这项研究的结果还表明，测试待植入材料的吸水性和溶解性可能会有意义，因为大多数材料都有一定的溶解性。
