Kahler Bill, Kotousov Andrei, Melkoumian Noune
School of Dentistry, University of Adelaide, SA 5005, Australia.
Dent Mater. 2006 Dec;22(12):1109-14. doi: 10.1016/j.dental.2005.09.006. Epub 2005 Dec 20.
The ultimate success or failure of a restored tooth is largely dependent on clinical management. Clinicians may choose from a number of restorative materials, different clinical techniques and cavity preparation procedures. The purpose of this study was to specifically examine aspects of the material choice holding other factors constant.
The current paper adopts a fundamental result in the linear theory of elasticity on the singular stress distribution in a bi-materials wedge to analyze the fracture susceptibility of different materials used for the restoration of a tooth.
Comparable results are reported for amalgam, gold alloys and ceramic materials. It is shown that due to a wide variety of mechanical properties the application of resin-based composites could lead to improved or less fracture resistance of the restored tooth.
This variety in the mechanical properties for resin-based composites could be partially responsible for the contradictory evidences reported by different clinical studies. The present work contributes evidence from an analytical model to assist the restorative dentist in selection of an appropriate restorative material and guide the manufacturing companies on the preferred physical properties of newer designed materials.
修复牙齿最终的成败很大程度上取决于临床管理。临床医生可以从多种修复材料、不同的临床技术和窝洞制备程序中进行选择。本研究的目的是在其他因素保持不变的情况下，具体考察材料选择的各个方面。
本文采用弹性线性理论中关于双材料楔体奇异应力分布的一个基本结果，来分析用于牙齿修复的不同材料的断裂易感性。
汞合金、金合金和陶瓷材料的结果具有可比性。结果表明，由于树脂基复合材料具有多种机械性能，其应用可能会提高或降低修复牙齿的抗断裂性。
树脂基复合材料机械性能的这种多样性可能部分解释了不同临床研究报告的相互矛盾的证据。本研究从一个分析模型提供了证据，以帮助修复牙医选择合适的修复材料，并指导制造公司了解新设计材料的理想物理性能。
