Background

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. Aims: 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.

中文翻译：

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牙科修复材料断裂韧性测试的实践和理论考虑

背景

在材料研究，开发和表征机械性能方面的重要工具是断裂韧性的测试。在执行此类测试时，必须具有高度的准确性，并在大量的测试标准文档中给出了严格的要求。熟练地制作和测试高质量的标本需要实践和扎实的理论背景，而在牙科界却常常被忽视。目的：在这篇综述中，我们研究了断裂力学概念的一些基础知识，这些概念与对断裂韧性测试的理解有关，并提请人们注意必须具有实用性的关键方面，以确保结果的有效性和准确性。