树脂亲水性对吸水率及弹性模量变化的影响。
Effects of resin hydrophilicity on water sorption and changes in modulus of elasticity.
作者信息
Ito Shuichi, Hashimoto Masanori, Wadgaonkar Bakul, Svizero Nadia, Carvalho Ricardo M, Yiu Cynthia, Rueggeberg Frederick A, Foulger Stephen, Saito Takashi, Nishitani Yoshihiro, Yoshiyama Masahiro, Tay Franklin R, Pashley David H
机构信息
Department of Operative Dentistry and Endodontology, School of Dentistry, Health Sciences University of Hokkaido, Sapporo, Japan.
出版信息
Biomaterials. 2005 Nov;26(33):6449-59. doi: 10.1016/j.biomaterials.2005.04.052.
UNLABELLED
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 15% decrease in modulus after 3 days. The most hydrophilic experimental resin absorbed 12.8 wt% 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.
未标注
由于自酸蚀粘结剂的酸性单体以高浓度掺入牙科粘结剂中，粘结剂变得更具亲水性。聚合物对水的吸附会导致增塑并降低机械性能。本研究的目的是比较五种根据霍伊溶解度参数排序的亲水性递增的实验性纯树脂（EX）和五种市售树脂的吸水率和弹性模量（E）。
方法
通过双轴弯曲测量所有树脂圆盘的初始模量后，将一半试样储存在十六烷中，其余试样储存在水中。对刚度进行了3天的重复测量。在平行实验中进行了吸水率和溶解度测量。
结果
储存在油中的试样模量均未出现任何显著下降。所有储存在水中的树脂模量均随时间下降，且与它们的吸水率成正比。EX的吸水率与极性力的霍伊溶解度参数（δ(p)）成正比，极性增加导致吸水率更高。亲水性最低的树脂吸水0.55 wt%，3天后模量下降15%。亲水性最高的实验树脂吸水12.8 wt%，同期模量下降73%。市售树脂吸水5%至12%，3天内模量降低19%至42%。
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