College of Dentistry, Department of Operative Dentistry, University of Florida, Box-J-100405 JHMHC, Gainesville, FL 32610-0405, USA.
Dent Mater. 2010 Feb;26(2):e63-77. doi: 10.1016/j.dental.2009.11.151. Epub 2009 Dec 31.
Dental adhesives are usually tested in shear or tension even though neither of these approaches measures the local stress triggering failure. Because the stress level varies extensively over the bonded surface, it seems as a fracture mechanics approach would be more appropriate. In this review different general aspects of fracture mechanics and adhesive joints were reviewed first. That review served as a foundation for a review of fracture toughness studies performed on dental adhesives. The dental adhesive studies were identified through a MEDLINE search using "dental adhesion testing AND enamel OR dentin AND fracture toughness" as search strategy. The outcome of the review revealed that fracture toughness studies performed on dental adhesives are complex, both regarding technical performance as well as achieving good discriminating ability between different adhesives. The review also suggested that most fracture toughness tests of adhesives performed in dentistry are not totally reliable because they usually did not consider the complex stress pattern at the adhesive interface. However, despite these limitations, the review strongly supports the notion that the proper way of studying dental adhesion is by use a fracture mechanics. At the present time, it seems as the fracture energy of adhesives might be more appropriate to determine than their fracture toughness values.
牙科胶粘剂通常在剪切或拉伸下进行测试，尽管这两种方法都不能测量引发失效的局部应力。由于粘结表面上的应力水平变化很大，因此似乎更适合采用断裂力学方法。在这篇综述中，首先回顾了断裂力学和胶粘剂接头的不同一般方面。该综述为牙科胶粘剂的断裂韧性研究提供了基础。通过使用“牙科粘接测试和牙釉质或牙本质和断裂韧性”作为搜索策略，通过 MEDLINE 搜索确定了牙科胶粘剂的研究。综述结果表明，对牙科胶粘剂进行的断裂韧性研究非常复杂，无论是在技术性能方面还是在不同胶粘剂之间实现良好的区分能力方面。该综述还表明，由于通常未考虑粘结界面处的复杂应力模式，因此牙科中进行的大多数胶粘剂断裂韧性测试并不完全可靠。但是，尽管存在这些局限性，该综述强烈支持这样的观点，即研究牙科粘结的正确方法是使用断裂力学。目前，似乎更适合确定胶粘剂的断裂能，而不是其断裂韧性值。
