镍基合金与饰面树脂的粘结强度及其粘结机制

Bonding between nickel-based alloys and resin-veneers: strength and mechanism

目的:研究国产与进口镍基合金材料分别与饰面树脂粘结后的剪切粘结强度并分析其粘结机制。方法:用国产和进口镍基合金分别制作16个试样与饰面树脂粘结后,共分为4组,将一组国产合金试样和一组进口合金试样置于热循环测试仪中循环300次,另两组置于37℃水浴中24 h取出,所有试样用自制夹具在万能测试仪上测试剪切强度并照金相照片。结果:热循环组国产合金和进口合金最大剪切强度为(10.50±2.72)(、13.12±2.82)MPa,两者之间无明显差异;非热循环组国产合金和进口合金最大剪切强度为(15.51±3.04)、(18.44±3.15)MPa,两者之间也无明显差异。但热循环组国产合金的最大剪切强度明显低于非热循环组国产合金(P<0.05),热循环组进口合金的最大剪切强度也明显低于非热循环组进口合金(P<0.05)。结论:国产镍基合金与进口合金在与饰面树脂结合方面结果类似,有良好的亲和性并且可以形成强度较高的、耐久的结合,其结合强度均不低于10 MPa,符合临床应用要求。

Objective：To determine the shear bond strength and analyze the bonding mechanism of home-made and imported nickel based alloys to resin veneers. Methods： Home made and imported alloy disks were cast by lost-wax technique and embedded in acrylic resin fabricating cylinders. Sixteen specimens of each alloy were divided into 2 subgroups： thermocycling group and non-thermocycling group. Specimens in thermocycling groups were submitted to thermocycling （300 cycles） and those in non-thermocycling groups were just stored in water at 37℃ for 24 h（0 cycles）. Then the shear bond strength values were determined by universal testing machine. The highest shear bond strength values were recorded and metallurgical analysis was performed on the interface between alloys and resin-veneers. Results： The shear bond strength values of both alloys to resin-veneers were relatively high either before or after thermocycling. The shear bond strength values of home-made alloy＋ thermocycling group, imported alloy＋ thermocycling group, home-made alloy＋ non-thermocycling group and imported alloy ＋ non-thermocycling group were （10.50±2.72）, （13.12±2.82）, （15.51±3.04） and （18. 44±3.15） MPa, respectively. The bond strength was significantly different before and after thermocycling for both alloys （P〈0.05）;no significant difference was observed between home made and imported alloy before or after thermocycling. Conclusion： The home made alloy, with good affinity, high shear strength（no less than 10 MPa） and good durability has similar bonding characteristic to that of imported alloy, and can fulfil the clinical usage.