使用有限元分析研究牙核心厚度对第一前磨牙修复冠的影响。
Influence of core thickness on a restored crown of a first premolar using finite element analysis.
作者信息
Proos Kaarel A, Swain Michael V, Ironside Jim, Steven Grant P
机构信息
School of Aerospace, Mechanical and Mechatronic Engineering, Faculty of Dentistry, University of Sydney, Biomaterials Science Research Unit, National Innovation Centre, Eveleigh, New South Wales, Australia.
出版信息
Int J Prosthodont. 2003 Sep-Oct;16(5):474-80.
PURPOSE
This study examined the influence of ceramic coping thickness on the maximum stresses that arise in a first premolar all-ceramic crown.
MATERIALS AND METHODS
Axisymmetric finite element models with different In-Ceram Alumina coping thicknesses (0.3, 0.6, and 0.9 mm) were examined. Models with and without resin lute were constructed. To all models, an identical axial load of 600 N was applied vertically downward, over an area around the crown's fissure.
RESULTS
The resulting peak tensile maximum principal stresses in each part of the crown existed below the fracture strengths of the respective materials making up the crown. This was true for all variations of core thickness, with and without resin lute. The peak tensile stresses in the coping, porcelain, and dentin decreased for an increase in core thickness. This was most evident in the porcelain and coping.
CONCLUSION
The thickness of the ceramic core has a significant influence on the resulting stresses in the coping, porcelain, and dentin of this axially loaded crown.
目的
本研究探讨了陶瓷基底冠厚度对第一前磨牙全瓷冠中出现的最大应力的影响。
材料与方法
研究了具有不同In-Ceram氧化铝基底冠厚度（0.3、0.6和0.9毫米）的轴对称有限元模型。构建了有和没有树脂粘结剂的模型。对所有模型，在冠部裂隙周围的区域垂直向下施加600 N的相同轴向载荷。
结果
在构成冠部的各材料的断裂强度以下，冠部各部分产生的峰值拉伸最大主应力均存在。对于有无树脂粘结剂的所有核厚度变化情况均如此。随着核厚度增加，基底冠、瓷层和牙本质中的峰值拉伸应力降低。这在瓷层和基底冠中最为明显。
结论
陶瓷核的厚度对该轴向加载冠的基底冠、瓷层和牙本质中的应力产生有显著影响。
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