两种金属内冠烤瓷桥桥体抗压强度的比较实验

目的：比较2种临床常用非贵金属-Bego钴铬合金及VB镍铬合金做内冠的金瓷三单位烤瓷桥桥体的抗压性能，为临床金瓷内冠材料的选择提供参考。方法：常规制作钴铬合金及镍铬合金内冠烤瓷桥各10组，置6mm直径钢球于桥体胎面，用万能试验机（Zwick／z100）以1mm／min的速度加压直至试样破坏，记录破坏时的载荷作t检验分析。结果：钴铬合金和镍铬合金内冠桥的平均破坏载荷值分别为2580．058N、1739．336N。结论：Bego钴铬合金内冠桥的抗压强度明显强于VB镍铬合金内冠桥的抗压强度。

Experimental study on the compressive strength of porcelain-fused-to-metal fixed bridge with different inner crown metal

Objective:To compare the compressive strength of porcelain-fused-to-metal fixed bridge with cobalt-chromium alloy inner crown and nickel and nickel-chromium alloy inner crown.Methods:Two types of PFM fixed bridge with cobalt-chromium alloy and nickel-chromium alloy inner crown were made as normal,each group has 10 teams.The bridges were put on the dies and tested for the compressive strength in Zwick/z100 universal testing machine,a steel ball of diameter 6 mm was used to press the bridge on the occlusal surface by 1mm/min until fracture occurred.Each fracture load was recorded and the data were analyzed by two-sample t-test.Results:The average fracture load was 2580.058N and 1739.336N for cobalt-chromium alloy inner crown PFM fixed bridge and nickel-chromium alloy inner crown PFM fixed bridge respectively.Conclusion:The compressive strength of cobalt-chromium alloy inner crown PFM fixed bridge was apparently better than that of nickel-chromium alloy inner crown ones.