Department of Prosthetic Dentistry and Biomaterials, Institute of Dentistry, University of Turku, Turku, Finland.
J Adhes Dent. 2010 Jun;12(3):175-82. doi: 10.3290/j.jad.a17538.
This study was conducted to evaluate the microtensile bond strength of composite resin to dentin with experimental rigid rod polymer (RRP) modified primers. RRP fillers are based on long stiff molecules specifically designed to create long polymers with restricted chain movement.
Experimental primers were fabricated by dissolving RRP into dichloromethane (DCM) and further mixing it with monomers: ethylene glycol methacrylate phosphate (EGMP), bis[2-(methacryloyloxy)-ethyl]phosphate (BMEP) and 3(methacryloyloxy)propyltrimethoxysilane (MPS). Eight experimental primers were prepared with different proportions for each dentin substrate. A commercial etch-and-rinse adhesive was used as a control. Surfaces of human molar teeth were wet ground occlusally. The experimental primers were applied onto dentin prior to light polymerization of the incremental composite resin build-up. After 48 hours of water storage, teeth were sectioned and tested with the microtensile tester. Fracture surface analysis and contact angle measurements of adhesive resin were performed. Scanning electron micrographs were taken.
3-way ANOVA revealed that all factors, monomer type, solvent-monomer ratio and RRP, had a significant effect (p < 0.05) on bond strength. Primer with a combination of MPS and dimethacrylate BMEP revealed higher bond values than a mixture of MPS and monomethacrylate EGMP. Increase of the solvent-monomer ratio and addition of RRP into primers increased the microTBS.
The contact angle measurements showed that RRP containing primers enhanced adhesive resin penetration into dentin similar to that of the control primer. Within the limitations of this study, it was concluded that an experimental type of modified RRP-silane-phosphate-acrylate primer was developed with comparable bonding properties to a commercial control.
本研究旨在评估使用实验性刚性棒聚合物（RRP）改性底漆将复合树脂与牙本质的微拉伸粘结强度。RRP 填料基于长而硬的分子，专门设计用于形成具有受限链运动的长聚合物。
实验性底漆通过将 RRP 溶解在二氯甲烷（DCM）中并进一步与单体混合制成：乙二醇甲基丙烯酸酯磷酸盐（EGMP）、双[2-（甲基丙烯酰氧基）乙基]磷酸酯（BMEP）和 3（甲基丙烯酰氧基）丙基三甲氧基硅烷（MPS）。对于每种牙本质基底，都使用不同的比例制备了 8 种实验性底漆。使用商业酸蚀-冲洗型胶粘剂作为对照。人类磨牙表面进行湿磨法颊舌向打磨。在逐步复合树脂堆积的光聚合之前，将实验性底漆涂在牙本质上。水储存 48 小时后，将牙齿切割并用微拉伸试验机进行测试。对胶粘剂的断裂面进行分析，并测量接触角。拍摄扫描电子显微镜照片。
3 因素方差分析显示，所有因素，单体类型、溶剂-单体比和 RRP，对粘结强度均有显著影响（p < 0.05）。MPS 和二甲基丙烯酸酯 BMEP 组合的底漆显示出比 MPS 和单甲基丙烯酸酯 EGMP 混合物更高的粘结值。增加溶剂-单体比和向底漆中添加 RRP 均可提高微 TBS。
接触角测量表明，含 RRP 的底漆可增强胶粘剂对牙本质的渗透，类似于对照底漆。在本研究的限制范围内，可以得出结论，已开发出一种具有类似粘结性能的实验性改性 RRP-硅烷-磷酸酯-丙烯酸盐底漆。
