Department of Mechanical and Aerospace Engineering, Trine University, 1 University Ave, Angola, IN, 46703, USA; Institute for Bioengineering Research (IBER), University of Kansas, 1530 W. 15th St, Lawrence, KS, 66045, USA.
Institute for Bioengineering Research (IBER), University of Kansas, 1530 W. 15th St, Lawrence, KS, 66045, USA.
J Mech Behav Biomed Mater. 2021 Aug;120:104563. doi: 10.1016/j.jmbbm.2021.104563. Epub 2021 Apr 29.
The mechanical performance of the dentin-adhesive interface contributes significantly to the failure of dental composite restorations. Rational material design can lead to enhanced mechanical performance, but this requires accurate characterization of the mechanical behavior at the dentin-adhesive interface. The mechanical performance of the interface is typically characterized using bond strength tests, such as the micro-tensile test. These tests are plagued by multiple limitations including large variations in the test results. The challenges associated with conventional tensile tests limit our ability to unravel the complex relationships that affect mechanical behavior at the dentin-adhesive interface. This study used the diametral compression test to overcome the challenges inherent in conventional bond strength tests. The bovine femur cortical bone tissue was considered as a surrogate material (the mineralized tissue) for human dentin. Two different adhesive formulations, which differed by means of their self-strengthening properties, were studied. The tensile behavior of the mineralized tissue, the adhesive polymer, and the bond strength of the mineralized tissue - adhesive interface was determined using the diametral compression test. The diametral compression test improved the repeatability for both the tensile and bond strength tests. The rate dependent mechanical behavior was observed for both single material and interfacial material systems. The tensile strength and bond strength of the mineralized tissue-adhesive interface was greater for the self-strengthening formulation as compared to the control.
牙本质-粘结剂界面的力学性能对牙科复合修复体的失效有重要影响。合理的材料设计可以提高力学性能，但这需要准确地描述牙本质-粘结剂界面的力学行为。界面的力学性能通常通过粘结强度测试来表征，如微拉伸测试。这些测试存在多个局限性，包括测试结果的较大差异。传统拉伸测试的挑战限制了我们揭示影响牙本质-粘结剂界面力学行为的复杂关系的能力。本研究使用径轴向压缩测试来克服传统粘结强度测试固有的挑战。牛股骨皮质骨组织被认为是人类牙本质的替代材料（矿化组织）。研究了两种不同的粘结剂配方，它们在自增强性能上有所不同。使用径轴向压缩测试确定了矿化组织、粘结剂聚合物的拉伸行为以及矿化组织-粘结剂界面的粘结强度。径轴向压缩测试提高了拉伸和粘结强度测试的可重复性。观察到了单一材料和界面材料系统的速率相关力学行为。与对照相比，自增强配方的矿化组织-粘结剂界面的拉伸强度和粘结强度更大。
