In vitro wear and fracture toughness of an experimental light-cured glass-ionomer cement.
In vitro wear and fracture toughness of an experimental light-cured glass-ionomer cement.
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实验性光固化玻璃离子水门汀的体外磨损和断裂韧性。
DOI：
10.1016/j.dental.2008.10.005
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Xie,Dong
中科院分区：
文献类型：
--
作者：
Zhao,Jun;Weng,Yiming;Xie,Dong
本研究的目的是评价一种实验性树脂改性玻璃离子水门汀（RMGIC）的体外磨损和断裂韧性（FT），该水门汀由新合成的6臂星形聚乙烯制成。（丙烯酸）和富士II液晶玻璃填料，并研究了几个重要的配方参数对磨损的影响-材料与方法对新研制的RMGIC进行了体外磨粒磨损、磨耗磨损和FT的评价。树脂复合材料P-60和RMGIC Fuji II LC用作对照。研究了甲基丙烯酸缩水甘油酯（GM）接枝率、粉液比（P/L）、聚合物/水比（P/W）及水中老化对接枝率的影响。除非另有说明，否则所有样品在测试前均在37°C的蒸馏水中调节1天。优化的实验水泥显示出与P-60几乎相同的高初始耐磨性，并且比Fuji II LC高得多。实验水泥显示出1.4倍以上的耐磨性比富士II LC，但比P-60低6倍。1个月老化后，骨水泥的耐磨性可与P-60竞争，磨损深度仅为P-60的1.3倍。实验骨水泥的FT值也明显高于Fuji II LC，但与P-60相似。结论这种新型实验骨水泥可能用于I类和II类高磨损和高应力部位的修复。
OBJECTIVEThe objective of this study was to evaluate the in vitro wear and fracture toughness (FT) of an experimental resin-modified glass–ionomer cement (RMGIC) formulated with the newly synthesized 6-arm star-shape poly(acrylic acid) and Fuji II LC glass fillers and investigate the effects of several important formulation parameters on wear-resistance and FT of the cement.MATERIALS AND METHODSThe in vitro abrasive and attritional wear as well as FT of the newly developed RMGIC were evaluated. The resin composite P-60 and RMGIC Fuji II LC were used as controls. The effects of glycidyl methacrylate (GM)-grafting ratio, powder/liquid (P/L) ratio, polymer/water (P/W) ratio and aging in water were investigated. All the specimens were conditioned in distilled water at 37°C for 1 day prior to testing, unless specified.RESULTSThe optimized experimental cement exhibited almost the same high initial wear-resistance to abrasion as P-60 and much higher than Fuji II LC. The experimental cement showed 1.4 times higher in resistance to attritional wear than Fuji II LC but 6 times lower than P-60. After 1-month aging, the cement can compete with P-60 in resistance to attritional wear by showing only 1.3 times more in wear depth. The experimental cement also showed a significantly higher FT value than Fuji II LC but a similar value to P-60.CONCLUSIONSIt appears that this novel experimental cement may be potentially used for high wear and high stress-bearing site restorations such as Class I and II.