Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity
Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity
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DOI：
10.1016/j.biomaterials.2005.04.052
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发表时间：
2005-11-01
期刊：
影响因子：
14
通讯作者：
Pashley, DH
中科院分区：
文献类型：
--
作者：
Ito, S;Hashimoto, M;Pashley, DH
当自酸蚀粘合剂的酸性单体以高浓度掺入牙科粘合剂中时，粘合剂变得更加亲水。聚合物吸水会导致塑化并降低机械性能。本研究的目的是比较五种亲水性不断增加的实验纯树脂（EX）的吸水率和弹性模量（E）（按霍伊溶解度参数排序）和五种商用树脂。方法：通过双轴弯曲测量所有树脂盘的初始模量后，将一半样品储存在十六烷中，其余样品储存在水中。连续三天重复测量刚度。在平行实验中进行水吸附和溶解度测量。结果：储存在油中的样品均未表现出模量的任何显着下降。所有储存在水中的树脂都表现出模量随时间的下降，这与它们的吸水程度成正比。 EX 的水吸附与极性力 (delta(p)) 的霍伊溶解度参数成正比，极性增加导致更高的吸附。最不亲水的树脂吸收了 0.55 wt% 的水，3 天后模量下降了 159110。最亲水的实验树脂吸收了 12.8wt% 的水，并在同一时期表现出 73% 的模量下降。商用树脂吸收了 5% 至 12% 的水，这导致模量在 3 天内下降了 19-42%。 (c) 2005 Elsevier Ltd. 保留所有权利。
As acidic monomers of self-etching adhesives are incorporated into dental adhesives at high concentrations, the adhesive becomes more hydrophilic. Water sorption by polymers causes plasticization and lowers mechanical properties. The purpose of this study was to compare the water sorption and modulus of elasticity (E) of five experimental neat resins (EX) of increasing hydrophilicity, as ranked by their Hoy's solubility parameters and five commercial resins.Methods: After measuring the initial modulus of all resin disks by biaxial flexure, half the specimens were stored in hexadecane and the rest were stored in water. Repeated measurements of stiffness were made for 3 days. Water sorption and solubility measurements were made in a parallel experiment.Results: None of the specimens stored in oil showed any significant decrease in modulus. All resins stored in water exhibited a time-dependent decrease in modulus that was proportional to their degree of water sorption. Water sorption of EX was proportional to Hoy's solubility parameter for polar forces (delta(p)) with increasing polarity resulting in higher sorption. The least hydrophilic resin absorbed 0.55 wt% water and showed a 159110 decrease in modulus after 3 days. The most hydrophilic experimental resin absorbed 12.8wt% water and showed a 73% modulus decrease during the same period. The commercial resins absorbed between 5% and 12% water that was associated with a 19-42% reduction in modulus over 3 days. (c) 2005 Elsevier Ltd. All rights reserved.