Pérez José A, Rodríguez-Rojas Fernando, Borrero-López Óscar, Sánchez-González Estíbaliz
Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006 Badajoz, Spain.
Materials (Basel). 2024 Apr 24;17(9):1961. doi: 10.3390/ma17091961.
Zirconia-reinforced lithium silicate (ZLS) is utilized as a material for prosthetic tooth crowns, offering enhanced strength compared to other dental glass-ceramics. In this study, we investigate a commercial ZLS material, provided in a fully crystallized form. We examine the effects of an optional post-processing heat treatment on micro-contact damage using controlled indentation tests simulating the primary modes of contact during chewing: axial and sliding. Our findings indicate that the heat treatment does not affect mechanical properties such as the elastic modulus, hardness and indentation fracture toughness. However, it does enhance the resistance to contact damage by fracture and chipping in both axial and sliding modes, as well as the resistance to crack initiation measured from sliding tests. This improvement is attributed to the refinement of the flaw population achieved through the heat treatment. The results are analysed using principles of contact and fracture mechanics theory, discussing their significance in prosthetic dentistry.
氧化锆增强硅酸锂（ZLS）被用作假牙冠的材料，与其他牙科玻璃陶瓷相比，其强度更高。在本研究中，我们研究了一种以完全结晶形式提供的商用ZLS材料。我们使用模拟咀嚼过程中主要接触模式（轴向和滑动）的控制压痕试验，研究了可选的后处理热处理对微接触损伤的影响。我们的研究结果表明，热处理不会影响诸如弹性模量、硬度和压痕断裂韧性等机械性能。然而，它确实增强了在轴向和滑动模式下对断裂和崩裂的接触损伤抵抗力，以及从滑动试验测得的抗裂纹萌生能力。这种改进归因于通过热处理实现的缺陷群体的细化。使用接触和断裂力学理论原理对结果进行了分析，并讨论了它们在口腔修复学中的意义。
