The fatigue bond strength of fixed-fixed versus cantilever resin-bonded partial fixed dental prostheses.
The fatigue bond strength of fixed-fixed versus cantilever resin-bonded partial fixed dental prostheses.
复制标题
固定固定与悬臂树脂粘合部分固定假牙的疲劳粘合强度。
DOI：
10.1016/j.prosdent.2013.07.004
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Botelho
中科院分区：
文献类型：
--
作者：
T. Wong;M. Botelho
问题陈述使用后部树脂粘结部分固定牙科修复体来替换缺失的前磨牙的修复以前被认为只有可变的成功。虽然2单元悬臂式树脂粘结部分固定牙科修复体已被证明具有与3单元对应物相似或改善的临床固位，本研究的目的是对两种不同的树脂粘结部分固定修复体设计进行体外疲劳载荷试验材料和方法镍铬合金铸件与悬臂（n=10）和固定-固定框架设计（n = 10）用树脂粘固剂粘结到不锈钢上，由模拟牙周韧带支撑的钢齿模，并承受循环载荷（12000次循环）。然后将基牙模拟物固定在万能试验机中，并将框架轴向加载远离牙模，直到失效。通过Mann-WhitneyU检验分析两种假体设计之间的粘结强度差异结果固定-固定组的粘结强度（332 N）在疲劳载荷作用下降低，而悬臂组的粘结强度（421 N）没有降低结论三单元固定-固定树脂粘结部分固定修复体的粘结强度低于两单元悬臂式树脂粘结部分固定修复体。当疲劳负荷时，粘结的部分固定牙科修复体。
Statement of problemRestorations using posterior resin-bonded partial fixed dental prostheses to replace missing premolar teeth were previously considered to have only variable success. Although 2-unit cantilevered resin-bonded partial fixed dental prostheses have been shown to have similar or improved clinical retention to their 3-unit counterparts, no in vitro evidence supports their use in preference to fixed-fixed designs.PurposeThe purpose of this in vitro study was to fatigue load 2 different resin-bonded partial fixed dental prosthesis designs (3-unit fixed-fixed and 2-unit cantilevered) and then compare their bond strengths after loading to failure.Material and methodsNickel chromium castings with cantilevered (n=10) and fixed-fixed framework designs (n=10) were bonded with a resin cement to stainless-steel tooth dies supported by a simulated periodontal ligament and subjected to cyclic loading (12 000 cycles). The abutment tooth analog was then secured in a universal testing machine, and the framework was loaded axially away from the tooth die until failure. Differences between the bond strengths of the 2 prosthesis designs were analyzed by a Mann-WhitneyUtest (P<.05).ResultsThe bond strengths of the fixed-fixed group (332 N) were lowered by fatigue loading but not the cantilevered group (421 N) (P<.05).ConclusionsThree-unit fixed-fixed resin-bonded partial fixed dental prostheses were found to have a lower bond strength than 2-unit cantilevered resin-bonded partial fixed dental prostheses when fatigue loaded.