This paper reports on the mechanical behavior of pre-crystallized CAD/CAM zirconia-reinforced lithium silicate glass ceramic (ZLS) using nanoindentation with a Berkovich diamond tip and in situ scanning probe microscopy (SPM). The indentation contact hardness, the elastic modulus, and the elasticity and plasticity of the material were determined using the Oliver-Pharr method, the Sakai model and the Meyer's law at peak loads of 2.5–10 mN and a loading rate of 0.5 mN/s. The load-displacement curves at all applied loads indicate that ZLS deformed plastically without fracture. The discrete discontinuities in the load-displacement curves might have arisen from the shear plane activation for plastic deformation. The measured hardness and elastic modulus were load-independent (ANOVA, p > 0.05), in ranges of 8.17 ± 1.23 GPa to 9.86 ± 1.24 GPa and 98.55 ± 7.38 GPa to 105.78 ± 9.98 GPa, respectively. The resistance to plasticity of ZLS significantly showed a second-order polynomial load relationship or a power law load dependency. Meanwhile, both the elastic and plastic displacements also significantly revealed power law load dependencies. However, the elastic and plastic deformation components were load-independent. Increased indentation loads resulted in significant decreases in the normalized elastic strain energy (p < 0.05) accompanied by significant increases in the normalized indentation absorbed energy (p < 0.05). The equivalent elasticity and plasticity of ZLS during indentation occurred at 7.5 mN. The outcomes of this study provide insights into fabrication and mechanical functions of ZLS restorations, particularly facilitating abrasive machining in dental CAD/CAM processing in the ductile regime.

本文报道了使用具有Berkovich金刚石尖端的纳米压痕和原位扫描探针显微镜（SPM）对预结晶的CAD / CAM氧化锆增强的硅酸锂玻璃陶瓷（ZLS）的力学行为。材料的压痕接触硬度，弹性模量以及材料的弹性和可塑性使用Oliver-Pharr方法，Sakai模型和Meyer定律确定，峰值载荷为2.5-10 mN，载荷率为0.5 mN / s 。在所有施加的载荷下的载荷-位移曲线表明ZLS塑性变形而没有断裂。载荷-位移曲线中的离散不连续性可能是由剪切面激活引起的塑性变形引起的。测得的硬度和弹性模量与负载无关（ANOVA，p > 0.05），范围分别为8.17±1.23 GPa至9.86±1.24 GPa和98.55±7.38 GPa至105.78±9.98 GPa。ZLS的可塑性具有显着的二阶多项式载荷关系或幂律载荷依赖性。同时，弹性位移和塑性位移也显着揭示了幂律载荷的依赖性。但是，弹性和塑性变形分量与载荷无关。压痕载荷的增加导致归一化弹性应变能的显着降低（p  <0.05），同时归一化压痕吸收的能量（p <0.05）。压痕过程中ZLS的等效弹性和塑性在7.5 mN时发生。这项研究的结果为ZLS修复体的制造和机械功能提供了见识，特别是在延展状态下促进牙科CAD / CAM加工中的磨料加工。