不同树脂水门汀和瓷表面处理对玻璃陶瓷粘结强度的影响

目的：评价4种不同的树脂水门汀以及2种不同的瓷表面处理方法对玻璃陶瓷粘结强度的影响。方法：选用IPse．Max Press热压铸瓷制作直径分别为5mm和4mm，高2mm的圆柱形瓷片。经打磨抛光后分为喇大组：（1）4％氢氟酸酸蚀40sec，（2）4％氢氟酸酸蚀40sec＋硅烷化处理1min。各组内分别选用VariolinkII，Multflink Sprint，RelyX Unicem，BisCem将大小瓷片成对粘固。再分别经37℃水储24h，以及水储后冷热循环5000次测定剪切强度，并用电镜观察瓷片表面形态。结果：硅烷化处理能明显提高粘结强度。经HF＋硅烷处理后Multflink Sprint（31．7±4．5MPa），BisCem（29．2±4．4MPa）和RelyX Unicem（28．1±5．5MPa）3组显示出较VafiolinkII（21．8±4．2MPa）高的粘结强度。冷热循环后除硅烷处理且用VariolinkII和RelyX Unicem粘固的实验组外，其余各组粘结强度均显著下降。结论：4种树脂水门汀与经HF和硅烷联合处理的玻璃陶瓷问能达到理想的粘结强度。

Influence of different resin cements and ceramic surface treatments on the shear bond strength to glass ceramic

Objective： The aim of this study was to evaluate the effect of four different resin cements and two surface conditioning treatments on shear bond strength to glass ceramic. Methods： Ceramic discs of two sizes （5mm and 4mm in diameter, 2mm in thickness, each size 128 discs）were fabricated with IPS.e.Max Press ingots, then were divided into two groups after polishing： （1） 4 % hydrofluoric acid 40s. （2）4 % hydrofluoric acid 40s ＋ silanization l min. The discs in two shapes were cemented together with one of the four resin cements（Variolink II, Multilink Sprint, Rely X Unicem, BisCem）. Half of the specimens were stored in water 37℃ for 24h and the other half were thermocycled 5000 times before shear bond strength test. Ceramic surface were examined with scanning electronic microscope. Results： Silanization treatment can significantly increase shear bond strength.The groups of Multilink Sprint（31.7 ± 4.5MPa）, BisCem（29.2 ± 4.4MPa）and RelyX Unicem（28.1 ±5.5MPa）indicated higher shear bond strength than that of VariolinkII（21.8 ± 4.2MPa）when treated with HF and silane before thermocyling. Thermocyling notably decrease the shear bond strength except that of Variolink II and Rely X Unicem after silanization. Conclusion： Four different resin cements can reach sufficient bond strength with glass ceramic treated with HF and silane.