Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Zahnklinik 1 - Zahnerhaltung und Parodontologie, Forschungslabor für dentale Biomaterialien, Glueckstrasse 11, 91054 Erlangen, Germany.
Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Zahnklinik 1 - Zahnerhaltung und Parodontologie, Forschungslabor für dentale Biomaterialien, Glueckstrasse 11, 91054 Erlangen, Germany; Department of Restorative Dentistry, Faculty of Dentistry, University of Concepción, Concepción, Chile.
Dent Mater. 2018 Jan;34(1):97-119. doi: 10.1016/j.dental.2017.11.016. Epub 2017 Dec 6.
An important tool in materials research, development and characterization regarding mechanical performance is the testing of fracture toughness. A high level of accuracy in executing this sort of test is necessary, with strict requirements given in extensive testing standard documents. Proficiency in quality specimen fabrication and test requires practice and a solid theoretical background, oftentimes overlooked in the dental community.
In this review we go through some fundamentals of the fracture mechanics concepts that are relevant to the understanding of fracture toughness testing, and draw attention to critical aspects of practical nature that must be fulfilled for validity and accuracy in results. We describe our experience with some testing methodologies for CAD/CAM materials and discuss advantages and shortcomings of different tests in terms of errors in testing the applicability of the concept of fracture toughness as a single-value material-specific property.
在机械性能方面，材料研究、开发和特性的一个重要工具是断裂韧性测试。执行这种测试需要高度的准确性，并在广泛的测试标准文件中给出了严格的要求。熟练掌握高质量的样本制造和测试需要实践和坚实的理论基础，但在牙科领域往往被忽视。
在这篇综述中，我们回顾了一些与理解断裂韧性测试相关的断裂力学概念的基础知识，并提请注意在实际应用中必须满足的关键方面，以确保结果的有效性和准确性。我们描述了我们在 CAD/CAM 材料的一些测试方法学方面的经验，并讨论了不同测试在测试断裂韧性概念作为单一值材料特性的适用性方面的误差方面的优缺点。
