多层氧化锆着色可能会影响其光学和机械性能

Journal of dental research Pub Date : 2024-10-01 Epub Date: 2024-10-04 DOI:10.1177/00220345241271211
S M Čokić, M Li, S Huang, J Vleugels, B Van Meerbeek, F Zhang
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引用次数: 0

摘要

整体牙用氧化锆的着色工艺引起了关于不同着色方法可能产生的影响的广泛讨论。本研究的主要目的是调查颜料对 3 种多层 5 摩尔%钇部分稳定氧化锆(5Y-PSZ)盘(Lava Esthetic A2 [Zr-AGG_A2] 和 Bleach [Zr-AGG_BL],均为 3M 口腔护理产品;Katana STML A2 [Zr-NoAGG],Kuraray Noritake)的影响。评估了颜料添加对半透明参数(TP00)、断裂韧性、维氏硬度、双轴强度和水热稳定性的影响,并将其与微观结构和相组成联系起来。颜料的组成和分布通过光显微镜、荧光显微镜、电子探针显微分析和纳米扫描电子显微镜进行了评估。分别使用 X 射线荧光和 X 射线衍射评估了颜料的化学成分和相组成以及老化行为,并使用显微拉曼光谱评估了颜料的老化敏感性。与具有典型 5Y-PSZ 显微结构的 Zr-NoAGG 相反,在 Zr-AGG_A2/BL 氧化锆中添加颜料会产生黄色和蓝色荧光的含 Er、Hf 和 Al 的大型团聚体,这些团聚体由 Y2O3 含量较低的小晶粒(分别为 0.57 µm 和 0.38 µm,而周围晶粒为 0.92 µm)组成。Zr-AGG_A2 的耐老化性最低,转化降解完全发生在颜料团聚体内部。所有氧化锆牌号都具有高 Y2O3 含量(4.2%-5.7 mol%)的四方氧化锆相和高含量(42%-55 wt%)的立方氧化锆相。虽然在硬度和韧性方面没有测得统计差异,但与 Zr-AGG_A2/BL 氧化锆相比,Zr-NoAGG 的 TP00 明显更高,抗折强度更高,机械可靠性更低。作为颜料添加到多层单片 Zr-AGG_A2/BL 氧化锆中的含稀土氧化物的氧化锆团聚体是导致其光学和机械性能降低以及耐老化性降低的原因。
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Coloring Multilayer Zirconia May Affect Its Optical and Mechanical Properties.

The coloring process of monolithic dental zirconia caused considerable debate on the possible effects of different coloring methods. The main objective of this study was to investigate the influence of pigments in 3 multilayer 5-mol% yttria partially stabilized zirconia (5Y-PSZ) disks (Lava Esthetic A2 [Zr-AGG_A2] and Bleach [Zr-AGG_BL], both 3M Oral Care, and Katana STML A2 [Zr-NoAGG], Kuraray Noritake). The influence of pigment addition on the translucency parameter (TP00), fracture toughness, Vickers hardness, biaxial strength, and hydrothermal stability was assessed and correlated with the microstructure and phase composition. The pigment composition and distribution were evaluated by light and fluorescence microscopy, electron probe microanalysis, and nano-scanning electron microscopy. The chemical and phase composition and aging behavior were assessed using X-ray fluorescence and X-ray diffraction, respectively, while the aging sensitivity of the pigments was evaluated using micro-Raman spectroscopy. In contrast to Zr-NoAGG, possessing a typical 5Y-PSZ microstructure, the pigment additions in both Zr-AGG_A2/BL zirconia resulted in large yellow and blue fluorescent Er-, Hf-, and Al-containing agglomerates composed of small grains (0.57 µm and 0.38 µm, respectively, vs. 0.92 µm for the surrounding grains) with lower Y2O3 content. Zr-AGG_A2 had the lowest aging resistance, with transformation degradation occurring exclusively within the pigment agglomerates. All zirconia grades had a high Y2O3 content (4.2%-5.7 mol%) tetragonal ZrO2 phase and a high (42%-55 wt%) cubic ZrO2 phase content. Although no statistical differences were measured for hardness and toughness, Zr-NoAGG had a significantly higher TP00, higher flexural strength, and lower mechanical reliability compared to both Zr-AGG_A2/BL zirconia. The rare-earth oxide-containing zirconia agglomerates that were added as pigments to the multilayered monolithic Zr-AGG_A2/BL zirconia are the cause for their lower optical and mechanical properties and reduced aging resistance.

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