Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY 10010, USA.
Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Dent Mater. 2019 Jan;35(1):15-23. doi: 10.1016/j.dental.2018.08.291. Epub 2018 Aug 29.
To survey simple contact testing protocols for evaluating the mechanical integrity of zirconia dental ceramics. Specifically, to map vital material property variations and to quantify competing damage modes.
Exploratory contact tests are conducted on layer structures representative of zirconia crowns on dentin.
Sharp-tip micro- and nano-indentations were used to investigate the roles of weak interfaces and residual stresses in veneered zirconia, and to map property variations in graded structures. Tests with blunt sphere indenters on flat specimens were used to identify and quantify various critical damage modes in simulated occlusal loading in veneered and monolithic zirconia.
Contact testing is a powerful tool for elucidating the fracture and deformation modes that control the lifetimes of zirconia dental ceramics. The advocated tests are simple, and provide a sound physical basis for analyzing damage resistance of anatomically-correct crowns and other complex dental prostheses.
调查用于评估氧化锆牙科陶瓷机械完整性的简单接触测试方案。具体来说，就是绘制重要材料性能变化图并量化竞争破坏模式。
对代表牙本质上氧化锆牙冠的层结构进行探索性接触测试。
采用尖微压痕和纳米压痕技术研究了弱界面和残余应力在贴面氧化锆中的作用，并绘制了梯度结构中的性能变化图。在平面试样上用钝球压头进行的测试用于识别和量化贴面和整体氧化锆模拟咬合加载中的各种关键破坏模式。
接触测试是阐明控制氧化锆牙科陶瓷使用寿命的断裂和变形模式的有力工具。所提倡的测试简单，为分析解剖正确的牙冠和其他复杂牙科修复体的抗损伤性提供了合理的物理基础。
