一端为非刚性连接体的后牙四单位金属翼板粘结桥的抗疲劳实验  

Wear test of 4-unit posterior resin bonded fixed partial dentures with non-rigid connector

作　　者：姜慧[1,2] 谭京[1] 王新知[1] 

机构地区：[1]北京大学口腔医学院·口腔医院修复科,北京100081 [2]首都医科大学附属北京友谊医院口腔科

出　　处：《北京大学学报（医学版）》2012年第1期84-87,共4页Journal of Peking University:Health Sciences

摘　　要：目的:评价带有非刚性连接体与刚性连接体后牙四单位金属翼板粘结桥在模拟口腔功能状态下抗疲劳寿命的差别。方法:选择新鲜完整的离体人第一前磨牙和第二磨牙作为基牙包埋于自凝树脂中,模拟第二前磨牙和第一磨牙的连续缺失,制作10个模型试块,随机均分为两组,实验组在第一前磨牙的远中设计栓体栓道式非刚性连接体,在第二磨牙的近中设计刚性连接体;对照组制作双端刚性连接的四单位金属翼板粘结桥,将试块置于冷热循环机械载荷咀嚼模拟疲劳试验机上进行加载,记录粘结桥发生破坏时的循环加载次数。结果:实验组与对照组初次粘结后发生破坏时的平均循环加载次数分别为(134.34±8.17)万次和(92.58±19.73)万次,经过独立样本t检验(双侧,α=0.05),差异具有统计学意义(P<0.05),即一端带有非刚性连接体的后牙四单位金属翼板粘结桥比双端均为刚性连接的后牙四单位金属翼板粘结桥的抗疲劳寿命长。结论:在体外模拟使用一端为非刚性连接体的长跨度金属翼板粘接桥的寿命要长于两端均为刚性连接体的传统粘接桥,结果需临床进一步验证。Objective： The aim of this study was to test the difference of fatigue longevity between the 4-unit posterior resin-bonded fixed partial dentures（RBFPD）with non-rigid connector and rigid connector,a wear test to stimulate masticatary function was used.Methods： Extracted intact human teeth were used to prepare specimens,a first premolar and a second molar as the abutment teeth with a space equivalent to a second premolar and a first molar.Ten specimens were seperated into two groups randomly.The control group was prepared to receive conventional RBFPDs;in the test group a non-rigid connector was used on the distal side of the first premolar.The specimens were put on the thermocycling and mechanical loading（TCML） chewing simulator until the prostheses were broken,and the loading times were recorded.Results： The loading times of the test group and the control group were respectively（134.34±8.17） ten thousand and（92.58±19.73） ten thousand,there was a significant difference between the test group and the control group（P0.05） analyzed by independent-samples t test（α=0.05）.So that the fatigue longevity of 4-unit posterior RBFPDs with non-rigid connector was greater than that of the rigid connector RBFPDs.Conclusion： The non-rigid connector could allow independent movement between the two parts of RBFPD and to decrease the stress between the tooth and the wing,and thus increases the fatigue longevity of long-span RBFPDs.

关 键 词：义齿固位 义齿设计 义齿 局部 固定 树脂粘结 

分 类 号：R783.3[医药卫生—口腔医学]