Biomaterials, Faculty of Dentistry, The University of Sydney, New South Wales.
Aust Dent J. 2011 Sep;56(3):302-11. doi: 10.1111/j.1834-7819.2011.01341.x. Epub 2011 Jul 10.
The clinical use of all-ceramic crowns and fixed partial dentures has seen widespread adoption over the past few years due to their increasing durability and longevity. However, the application of inlays as an abutment design has not been as readily embraced because of their relatively high failure rates. With the use of an idealized inlay preparation design and prosthesis form which better distributes the tensile stresses, it is possible to utilize the inlay as support for an all-ceramic fixed partial denture. Utilizing a three-dimensional finite element analysis, a direct comparison of the inlay supported all-ceramic bridge against the traditional full crown supported all-ceramic bridge is made. The results demonstrate that peak stresses in the inlay bridge are around 20% higher than in the full crown supported bridge with von Mises peaking at about 730 MPa when subjected to theoretical average maximum bite force in the molar region of 700 N, which is similar to the ultimate tensile strengths of current zirconia based ceramics.
在过去的几年中，由于全瓷冠和固定局部义齿的耐用性和寿命不断提高，它们的临床应用得到了广泛的采用。然而，由于其相对较高的失败率，嵌体作为基牙设计的应用并未得到广泛接受。通过使用理想化的嵌体预备设计和更好地分布拉伸应力的修复体形态，可以利用嵌体作为全瓷固定局部义齿的支持。利用三维有限元分析，对嵌体支持的全瓷桥与传统的全冠支持的全瓷桥进行了直接比较。结果表明，在承受磨牙区理论最大平均咬合力 700N 的情况下，嵌体桥的峰值应力比全冠支持桥高约 20%，von Mises 峰值约为 730MPa，与目前氧化锆基陶瓷的极限拉伸强度相似。
