Effect of bifunctional comonomers on mechanical strength and water sorption of amorphous calcium phosphate- and silanized glass-filled Bis-GMA-based composites
Effect of bifunctional comonomers on mechanical strength and water sorption of amorphous calcium phosphate- and silanized glass-filled Bis-GMA-based composites
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DOI：
10.1016/s0142-9612(03)00119-4
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发表时间：
2003-08-01
期刊：
影响因子：
14
通讯作者：
Antonucci, JM
中科院分区：
文献类型：
--
作者：
Skrtic, D;Antonucci, JM
本研究旨在阐明一系列未填充牙科共聚物及其复合材料的结构-性能关系。共聚物/复合材料衍生自基于2，2-双[p-2 ′-羟基-3-甲基丙烯酰氧基丙氧基）苯基]丙烷（Bis-GMA）和等摩尔量的双官能表面活性共聚单体（即，2-甲基丙烯酸羟乙酯（HEMA）、二甲基丙烯酸甘油酯（GDMA）或乙二醇甲基丙烯酸酯磷酸酯（PHEMA）。三甘醇二甲基丙烯酸酯，一种广泛使用的用于Bis-GMA的共聚单体，用作对照。研究了两种类型的填料：（1）亲水性的二氧化硅改性的无定形磷酸钙（Si-ACP）和（2）更疏水的硅烷化纳米二氧化硅（n-SiO2）。未填充的共聚物和它们的复合材料都进行了评价双轴弯曲强度（BFS），在缓冲盐水中浸泡30天后，干燥和湿润，和吸水性（WS）和它们的WS动力学曲线。衍生自HEMA和GDMA的Bis-GMA共聚物和复合材料具有与对照相似的BFS和WS值以及WS动力学曲线。基于Bis-GMA/PHEMA的共聚物和复合材料具有较低的BFS和较高的WS值。Si-ACP复合材料具有比其共聚物显著更低的BFS值（在浸泡时进一步减小）。WS随着该填料含量的增加而增加，除了Bis-GMA/PHEMA复合材料。与n-SiO2作为填料，更温和的减少BFS发生相比，未填充的共聚物。与Si-ACP复合材料相比，所有n-SiO2复合材料的WS随着填料水平的增加而降低。从这项研究中可以看出，聚合物基质的化学结构和填料系统的类型对牙科复合材料的强度和与水相关的性能都有显着的影响。(C)2003爱思唯尔科技有限公司版权所有。
This study seeks to elucidate structure-property relationships in a series of unfilled dental copolymers and their composites. The copolymers/composites were derived from photo-activated binary monomer systems based on 2,2-bis[p-2'-hydroxy-3-methacryloxypropoxy)phenyl] propane (Bis-GMA) and equimolar amounts of a bifunctional, surface-active comonomer, i.e., 2-hydroxyethyl methacrylate (HEMA), glycerol dimethacrylate (GDMA) or ethylene glycol methacrylate phosphate (PHEMA). Triethyleneglycol dimethacrylate, a widely used comonorner for Bis-GMA, was used as a control. Two types of fillers were investigated: (1) a hydrophilic, silica-modified amorphous calcium phosphate (Si-ACP) and (2) a more hydrophobic, silanized nanosized silica (n-SiO2). Both the unfilled copolymers and their composites were evaluated for biaxial flexure strength (BFS), both dry and wet after 30 days immersion in buffered saline, and for water sorption (WS) and their WS kinetic profiles. The Bis-GMA copolymers and composites derived from HEMA and GDMA had BFS and WS values, as well as WS kinetic profiles, similar to the controls. Copolymers and composites based on Bis-GMA/PHEMA had lower BFS and higher WS values. Si-ACP composites had significantly lower BFS values (that were further diminished on soaking) than their copolymers. WS increased as the level of this filler was increased except for Bis-GMA/PHEMA composites. With n-SiO2 as the filler, a more moderate reduction in BFS occurred compared to the unfilled copolymers. By contrast to Si-ACP composites, the WS of all the n-SiO2 composites decreased with increasing filler level. From this study it is evident that both the chemical structure of the polymer matrix and the type of filler system call have significant effects on the strength and water-related properties of dental composites. (C) 2003 Elsevier Science Ltd. All rights reserved.