后牙金沉积内冠熔结镍铬桥体烤瓷桥的实验力学分析

目的:测量后牙金沉积内冠熔结镍铬桥体烤瓷桥的断裂应力,为其临床应用提供理论上的依据.方法:制作46缺失的标准下颌模型,设计以47和45为基牙,采用耐高温粘结剂熔结金沉积固位体内冠和镍铬金属桥体连接体的烤瓷桥5个,固定于力学万能实验机平台上,在桥体中央窝以每分钟2.0 mm的压力垂直、连续、均匀加载,测定其断裂应力.结果:后牙金沉积内冠熔结镍铬桥体烤瓷桥的断裂应力为(877.00±126.53)N,其金属固位体和桥体的断裂应力为(1 448.94±51.02)N.结论:后牙金沉积内冠熔结镍铬桥体烤瓷桥可以承担正常人的(牙合)力.

Experimental mechanics analysis of posterior galvano-ceramic bridges made by Ni-Cr pontic fired bonding galvano caps

OBJECTIVE: To measure the fracture strength of the posterior galvano-ceramic bridges made by Ni-Cr pontic fired bonding galvano caps with highly temperature-resistant adhesive and to provide reference data for clinical application. METHODS: A standard low dental cast was achieved with 46 missing. Five posterior galvano-ceramic bridges made by Ni-Cr pontic fired bonding galvano caps, with abutments being 47 and 45. The low dental cast was fixed on the panel of the universal testing machine, vertical load given on the central of the pontic as the velocity of 2 mm/min. RESULTS: The fracture strength of the posterior galvano-ceramic bridges made by Ni-Cr pontic fired bonding galvano caps was (877.00+/-126.53) N, the fracture strength of the metal frame was (1,448.94+/-51.02) N. CONCLUSION: Posterior galvano-ceramic bridges made by Ni-Cr pontic fired bonding galvano caps could endure the normal human occlusal force.