A novel light-cured glass-ionomer system for improved dental restoratives.
A novel light-cured glass-ionomer system for improved dental restoratives.
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一种新型光固化玻璃离聚物系统，用于改进牙科修复剂。
DOI：
10.1007/s10856-007-3100-z
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Park,Jong-Gu
中科院分区：
文献类型：
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作者：
Xie,Dong;Zhao,Jun;Park,Jong-Gu
以四臂星形聚丙烯酸（AA）和甲基丙烯酸缩水甘油酯为原料，制备了一种新型光固化玻璃离子水门汀（LCGIC）。采用原子转移自由基聚合法合成了四臂聚（AA）聚合物。纯化的聚合物用于与水和Fuji II LC填料一起配制以形成LCGIC。抗压强度（CS）被用作评价的筛选工具。研究了接枝率、聚合物/水（P/W）比、填料/聚合物液（P/L）比和老化对复合材料强度的影响。在测试之前，将所有样品在37 °C的蒸馏水中调节24小时。结果表明，4-臂聚（AA）聚合物表现出较低的粘度相比，通过常规的自由基聚合合成的线性对应物。与Fuji Ⅱ LC相比，新型LCGIC体系的CS含量提高了13%，径向拉伸强度提高了86%，弯曲强度提高了123%，收缩率降低了93.6%。增加P/W比显着增加CS和CSTR。随着接枝率的增加，CS从35%增加到50%，但不是从50%增加到70%。同样，当P/L比增加时，CS从2.2增加到2.7，但不是从2.7增加到3.0。在老化过程中，最终CS（MPa）显着增加，从209.2在1小时到329.7在1周。看来，这种新型LCGIC系统将是一种更好的牙科修复体，因为它表现出改善的机械强度以及很少的收缩，并可能消除目前LCGIC中由沥滤的HEMA引起的细胞毒性。
A novel light-cured glass-ionomer cement (LCGIC) system based on the 4-arm star-shape poly(acrylic acid) (AA) tethered with glycidyl methacrylate has been developed. The 4-arm poly(AA) polymer was synthesized using atom-transfer radical polymerization. The purified polymer was used to formulate with water and Fuji II LC filler to form LCGICs. Compressive strength (CS) was used as a screening tool for evaluation. The effects of grafting ratio, polymer/water (P/W) ratio, filler powder/polymer liquid (P/L) ratio and aging on strengths were investigated. All the specimens were conditioned in distilled water at 37 °C for 24 h prior to testing. The results show that the 4-arm poly(AA) polymer exhibited a lower viscosity as compared to its linear counterpart that was synthesized via conventional free-radical polymerization. This novel LCGIC system was 13% in CS, 86% in diametral tensile strength (DTS) and 123% in flexural strength higher but 93.6% in shrinkage lower than Fuji II LC. Increasing P/W ratio significantly increased both CS and DTS. Upon increasing grafting ratio, the CS was increased from 35% to 50% but not from 50% to 70%. Likewise, when P/L ratio was increased, the CS was increased from 2.2 to 2.7 but not from 2.7 to 3.0. During aging, the ultimate CS (MPa) was significantly increased from 209.2 at 1 h to 329.7 at 1 week. It appears that this novel LCGIC system will be a better dental restorative because it demonstrated improved mechanical strengths as well as little shrinkage and may eliminate cytotoxicity in current LCGICs caused by leached HEMA.