Nakai Hiroto, Inokoshi Masanao, Liu Hengyi, Uo Motohiro, Kanazawa Manabu
Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo 113-8549, Japan.
Department of Oral Devices and Materials, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo 113-8549, Japan.
J Funct Biomater. 2025 Jan 3;16(1):13. doi: 10.3390/jfb16010013.
Highly translucent zirconia (TZ) is frequently used in dentistry. The properties of several highly translucent zirconia materials available in the market require an in-depth understanding. In this study, we assessed the translucency, crystalline phase, mechanical properties, and microstructures of three newly developed highly translucent zirconia materials (Zpex 4. m, 4 mol% yttria-stabilized zirconia: 4YSZ; Zpex Smile.m, 5YSZ; ZR Lucent ULTRA, 6YSZ). The translucency parameter (TP) was analyzed using the CIELAB system. X-ray diffraction was conducted for the crystalline phase analysis, followed by Rietveld refinement. A biaxial flexural strength test using the Weibull analysis was performed to evaluate the mechanical properties. Scanning electron microscopy, grain size distribution, and average grain size were used to analyze the microstructures. The TP content of the ZR Lucent ULTRA was the highest among the samples investigated. The Rietveld analysis revealed that the cubic zirconia phase content of the ZR Lucent ULTRA was the highest. The biaxial flexural strength of the ZR Lucent ULTRA was the lowest (622.9 MPa). The average grain size and proportion of large grains (1.0 µm < x) were the highest in ZR Lucent ULTRA. Therefore, extra-high translucent zirconia has the potential for use in anterior monolithic restorations owing to its esthetics and strength.
高透明度氧化锆（TZ）在牙科领域应用广泛。市场上几种高透明度氧化锆材料的性能需要深入了解。在本研究中，我们评估了三种新开发的高透明度氧化锆材料（Zpex 4.m，4摩尔％氧化钇稳定氧化锆：4YSZ；Zpex Smile.m，5YSZ；ZR Lucent ULTRA，6YSZ）的透明度、晶相、力学性能和微观结构。使用CIELAB系统分析透明度参数（TP）。进行X射线衍射以进行晶相分析，随后进行Rietveld精修。使用威布尔分析进行双轴弯曲强度测试以评估力学性能。使用扫描电子显微镜、晶粒尺寸分布和平均晶粒尺寸分析微观结构。在所研究的样品中，ZR Lucent ULTRA的TP含量最高。Rietveld分析表明，ZR Lucent ULTRA的立方氧化锆相含量最高。ZR Lucent ULTRA的双轴弯曲强度最低（622.9 MPa）。ZR Lucent ULTRA的平均晶粒尺寸和大晶粒（1.0 µm < x）比例最高。因此，超高透明度氧化锆因其美观性和强度而具有用于前牙整体修复的潜力。
