de Vree J H, Peters M C, Plasschaert A J
J Dent Res. 1984 Oct;63(10):1217-20. doi: 10.1177/00220345840630101001.
In this study, two different cavity designs were compared from a mechanical point of view: (a) an axisymmetric model of a conventional class 1 cavity preparation and restoration; and (b) an axisymmetric model of a modified cavity design. The modified design was characterized by a cavo-surface angle (c.s.a.) of approximately 90 degrees and a stepped cavity wall. Using a mathematical model, stresses were calculated by finite element analysis to compare the force distribution. It is concluded that the clinical superiority of the modified cavity design, with respect to the marginal breakdown of the amalgam restoration, can be supported by stress calculations.
在本研究中，从力学角度比较了两种不同的洞型设计：(a)传统I类洞预备与修复的轴对称模型；(b)改良洞型设计的轴对称模型。改良设计的特点是洞缘角（c.s.a.）约为90度且洞壁呈阶梯状。使用数学模型，通过有限元分析计算应力以比较力的分布。得出结论：改良洞型设计在汞合金修复体边缘折裂方面的临床优势可以通过应力计算得到支持。
