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首页> 外文期刊>Acta biomaterialia >The effect of margin thickness, degree of convergence and bonding interlayer on the marginal failure of glass-simulated all-ceramic crowns
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The effect of margin thickness, degree of convergence and bonding interlayer on the marginal failure of glass-simulated all-ceramic crowns

机译：边缘厚度，会聚度和粘结中间层对玻璃模拟全瓷冠的边缘破坏的影响

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摘要

The objectives of this study were to identify the effect of design parameters, namely marginal thickness, degree of convergence and the different interfacial conditions, on the initial failure load that induces cracking from the margin in glass-simulated dental crowns. Crown-like glass cylinders were prepared to simulate posterior all-ceramic crowns with two different marginal thicknesses (0.8 or 1.2 mm) and degrees of convergence (6° or 12°). A three-step bonding system was used complementarily with a silane coupling agent to adhesively bond the specimens to resin dies. The crowns were subjected to an axial applied load to generate hoop tensile stress at the crown margin. The entire loading and fracture processes were recorded by video camera. The loading data were compared with the other two interfacial treatments (Vaseline grease and directly poured uncured resin on glass). The Weibull distribution was used to statistically analyze the characteristic failure load and the mean values. The fracture surfaces were fractographically analyzed along with the load-displacement curves, and the degrees of crack stability for each parameter were also identified. It was found that there is no difference in the initial failure load between the different marginal thicknesses in all interfacial conditions. The bonded crowns present more resistance to crack propagation. The higher convergence crown preparation can reduce the initial failure load at the crowns' margin, which can be resisted by a strongly bonded interface. Clear interactions between margin design parameters and their effects on the stress development and crack propagation are necessary to develop an appropriate design of all-ceramic crowns.
机译：这项研究的目的是确定设计参数（即边缘厚度，会聚程度和不同的界面条件）对初始破坏载荷的影响，该初始破坏载荷会导致玻璃模拟牙冠的边缘破裂。准备冠状玻璃圆柱体，以模拟具有两个不同边际厚度（0.8或1.2毫米）和会聚度（6°或12°）的后部全瓷冠。三步粘合系统与硅烷偶联剂互补使用，将样品粘合到树脂模具上。牙冠承受轴向施加的载荷，以在牙冠边缘产生环向拉应力。整个加载和断裂过程由摄像机记录。将载荷数据与其他两种界面处理（凡士林油脂和未固化树脂直接倒在玻璃上）进行了比较。韦布尔分布用于统计分析特征破坏载荷和平均值。对断裂面和载荷-位移曲线进行了分形分析，并确定了每个参数的裂纹稳定性。发现在所有界面条件下，不同边缘厚度之间的初始破坏荷载没有差异。粘结的胎冠具有更大的抗裂纹扩展能力。较高收敛度的胎冠准备工作可以减少胎冠边缘的初始破坏载荷，而这可以通过牢固粘结的界面来抵抗。边缘设计参数之间的清晰相互作用及其对应力发展和裂纹扩展的影响对于开发适当的全瓷冠设计是必要的。

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