Faculty of Dentistry, Discipline of Biomaterials, The University of Sydney, New South Wales.
Aust Dent J. 2013 Dec;58(4):434-41. doi: 10.1111/adj.12107.
This study is the last in a series detailing an investigation into the all-ceramic, inlay supported fixed partial denture, the major concern of which has been the examination of the stress responses of the bridge via the use of finite element analysis (FEA) and its validation. The progression from a classic FEA to the current extended or enriched FEA (XFEA) will be described and the validation performed.
XFEA modelling was compared and validated against the experimental model analysis (EMA) as described in a previous study.
The two EMA load case fracture strengths of 160 N and 313 N compared favourably with the best two fracture predictions from the XFEA of 185 N and 213 N (maximum principal stress criterion) respectively, with the origin of fracture and overall trajectory and pattern of crack propagation agreeing very well.
XFEA load prediction is within 15% of the EMA in the best case. The sensitivity of the bridges to loading position variations was accurately predicted by the XFEA, together with the change in fracture origin from the molar to premolar embrasures. With this, the authors believe that they have provided a convincing validation, both qualitatively and quantitatively, of an anatomically realistic dental bridge.
本研究是一系列详细研究全陶瓷嵌体支持固定局部义齿的最后一项研究，主要关注通过有限元分析（FEA）及其验证来检查桥梁的应力响应。将描述从经典 FEA 到当前扩展或丰富的 FEA（XFEA）的进展，并进行验证。
将 XFEA 建模与之前研究中描述的实验模型分析（EMA）进行比较和验证。
两个 EMA 载荷情况的断裂强度为 160N 和 313N，与 XFEA 的最佳两个断裂预测值 185N 和 213N（最大主应力准则）相比表现良好，断裂起源、整体轨迹和裂纹扩展模式非常吻合。
在最佳情况下，XFEA 的载荷预测在 EMA 的 15%以内。XFEA 准确预测了桥梁对加载位置变化的敏感性，以及从磨牙到前磨牙间隙的断裂起源的变化。通过这些，作者认为他们已经提供了对解剖学上逼真的牙科桥梁的定性和定量验证。
