Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil.
Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil; College of Dentistry, Sao Francisco University (USF), 218 Sao Francisco de Assis Avenue, 12916-900, Bragança Paulista, SP, Brazil.
J Mech Behav Biomed Mater. 2021 Aug;120:104547. doi: 10.1016/j.jmbbm.2021.104547. Epub 2021 Apr 21.
This study aimed to analyze different methodologies (tensile, microtensile, shear, microshear, and interfacial toughness) for evaluation of the bond strength between zirconia (Y-TZP) and resin cement. Zirconia ceramic blocks (VITA in-Ceram® YZ, VITA Zahnfabrik, Germany) were obtained, substrate surfaces were air-abraded with aluminum oxide (50 μm) for 10 s (2 bar pressure, distance: 10 mm, angle: 90°). Then, the specimens were washed with distilled water, dried, and coated with Clearfil Ceramic Primer that was actively applied with a microbrush for 20 s. The specimens were then cemented with resin cement under a load of 750 g, followed by photo-polymerization (40 s on each surface). After cementation, the specimens were aged in thermocycling (8000 cycles, 5-55 °C, 30 s for each bath) and subjected to tensile, microtensile, shear, microshear or interfacial toughness tests. All specimens were inspected for failure modes. The microtensile test showed the highest bond value (18.29 N/mm). The microshear tests showed the highest coefficient of variation (0.59) and highest number of pre-test failures. The interfacial energy to fracture test showed that as the shear stress increased its interaction in the adhesive interface, the coefficient of variation also increased. The bond strength of Y-TZP showed different results according to the methodology, as well as its interfacial energy to fracture varied according to the angulation/type of stress specimen was submitted. The lower the shear stress at the adhesive interface of the mixed tests (interfacial energy to fracture), the lower was the variability of the test.
本研究旨在分析不同方法（拉伸、微拉伸、剪切、微剪切和界面韧性）评估氧化锆（Y-TZP）与树脂水门汀之间的粘结强度。获得氧化锆陶瓷块（VITA in-Ceram® YZ，VITA Zahnfabrik，德国），用氧化铝（50μm）对基底表面喷砂 10s（2 巴压力，距离：10mm，角度：90°）。然后，用去离子水冲洗试件，干燥后用 Clearfil Ceramic Primer 主动涂刷微刷 20s。在 750g 负载下用树脂水门汀粘结试件，然后进行光聚合（每个表面 40s）。粘结后，将试件在热循环（8000 次循环，5-55°C，每次循环 30s）中老化，然后进行拉伸、微拉伸、剪切、微剪切或界面韧性测试。所有试件均检查失效模式。微拉伸试验显示最高粘结值（18.29N/mm）。微剪切试验显示最高变异系数（0.59）和最高预测试失败数。断裂界面能试验表明，随着剪切应力的增加，其在粘结界面的相互作用也增加，变异系数也随之增加。Y-TZP 的粘结强度根据方法不同而不同，其断裂界面能也根据试件所受的角/类型应力而不同。混合试验（断裂界面能）中粘结界面的剪切应力越低，试验的变异性越低。
