Department of Biomaterials and Devices, Kanagawa Dental College, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan.
Dent Mater J. 2011;30(1):115-20. doi: 10.4012/dmj.2010-129. Epub 2011 Jan 26.
To reduce the adverse effects of water on the mechanical properties and bonding durability of glass ionomer cements, experimental cements which used a temperature-responsive polymer as the cement liquid were prepared and evaluated in this study. Temperature-responsive copolymers were synthesized using radical polymerization with varying molar ratios of N-isopropylacrylamide (NIPAM) and acrylic acid (AA). It was found that copolymer synthesis with varying ratios of NIPAM and AA was able to modify the lower critical solution temperature to range between 27 and 42°C. Bond strength of the cement prepared from AA/NIPAM copolymer containing 53 mol% AA was better than that prepared from polyacrylic acid (PAA) - the conventional cement liquid. However, compressive strength of the experimental cement was slightly lower than that of PAA cement.
为了降低水对玻璃离子水门汀机械性能和粘结耐久性的不利影响，本研究制备并评价了使用温敏聚合物作为水门汀液的实验性水门汀。采用自由基聚合，用不同摩尔比的 N-异丙基丙烯酰胺（NIPAM）和丙烯酸（AA）合成温敏共聚物。结果发现，共聚合成 NIPAM 和 AA 的不同比例能够将低临界溶液温度调节至 27 至 42°C 之间。由含有 53mol%AA 的 AA/NIPAM 共聚物制备的水门汀的粘结强度优于传统的水泥液聚甲基丙烯酸（PAA）。然而，实验性水门汀的抗压强度略低于 PAA 水门汀。
