高透光性氧化锆陶瓷的微观结构、物理和光学特性研究。
Microstructural, physical, and optical characterization of high-translucency zirconia ceramics.
机构信息
Doctoral Researcher, Department of Prosthodontics, School of Dentistry, University of Istanbul, Istanbul, Turkey.
Professor, Department of Prosthodontics, School of Dentistry, University of Istanbul, Istanbul, Turkey.
出版信息
J Prosthet Dent. 2020 May;123(5):761-768. doi: 10.1016/j.prosdent.2019.05.004. Epub 2019 Aug 2.
STATEMENT OF PROBLEM
The microstructural, physical, and optical properties of newly available highly-translucent zirconia ceramics have not been thoroughly investigated.
PURPOSE
The purpose of this in vitro study was to evaluate the microstructural, physical, and optical properties of current zirconia ceramics with different degrees of translucency and to compare the optical properties with lithium disilicate glass-ceramic at different thicknesses.
MATERIAL AND METHODS
Disk-shaped specimens (N=108) were prepared from 3 different monolithic zirconia ceramics: VITA YZ HT (YZ-HT), VITA YZ ST (YZ-ST), and VITA YZ XT (YZ-XT) and lithium disilicate glass-ceramic (IPS e-max CAD LT [IPS]) with a diameter of 14 mm and 3 different thicknesses (0.5, 1.0, and 1.5 mm ±0.02 mm). The microstructural features (grain size, elemental composition, phase identifications, and quantifications), physical properties (Vickers hardness and fracture toughness), and optical properties (translucency parameter and contrast ratio) were investigated. Data were analyzed using 1-way ANOVA, followed by the post hoc Tukey tests or Kruskal-Wallis and Mann-Whitney U tests (α=.05).
RESULTS
Differences in grain size, phase assemblages, fracture toughness, translucency parameter, and contrast ratio were found to be significant (P<.05). The average grain size was different for the 3 zirconia specimens with the following order: YZ-XT>YZ-ST>YZ-HT. The fracture toughness of YZ-HT was higher than that of YZ-ST and YZ-XT (P<.05). IPS with 0.5-mm thickness had the highest TP followed by YZ-XT and YZ-ST. The CR values were in the range of 0.54 to 0.91 (YZ-HT), 0.43 to 0.61 (YZ-ST), 0.29 to 0.45 (YZ-XT), and 0.27 to 0.53 (IPS), and all decreased with an increase in thickness.
CONCLUSIONS
Based on the results of the present study, the microstructural, physical, and optical properties of zirconia ceramics were affected by the changes in chemical composition and sintering parameters.
问题陈述
新出现的高透明度氧化锆陶瓷的微观结构、物理和光学性能尚未得到彻底研究。
目的
本体外研究的目的是评估不同透明度的氧化锆陶瓷的微观结构、物理和光学性能，并比较不同厚度的氧化锆陶瓷与锂硅玻璃陶瓷的光学性能。
材料和方法
从三种不同的整体氧化锆陶瓷（VITA YZ HT[YZ-HT]、VITA YZ ST[YZ-ST]和 VITA YZ XT[YZ-XT]）和锂硅玻璃陶瓷（IPS e-max CAD LT[IPS]）中制备直径为 14mm 且厚度为 0.5、1.0 和 1.5mm±0.02mm 的圆盘状试件（N=108）。研究了微观结构特征（晶粒尺寸、元素组成、相鉴定和定量）、物理性能（维氏硬度和断裂韧性）和光学性能（透光率参数和对比度比）。使用单因素方差分析，然后使用事后 Tukey 检验或 Kruskal-Wallis 和 Mann-Whitney U 检验（α=.05）对数据进行分析。
结果
发现晶粒尺寸、相组成、断裂韧性、透光率参数和对比度比存在显著差异（P<.05）。3 种氧化锆样品的平均晶粒尺寸顺序为：YZ-XT>YZ-ST>YZ-HT。YZ-HT 的断裂韧性高于 YZ-ST 和 YZ-XT（P<.05）。厚度为 0.5mm 的 IPS 具有最高的 TP，其次是 YZ-XT 和 YZ-ST。CR 值范围为 0.54 至 0.91（YZ-HT）、0.43 至 0.61（YZ-ST）、0.29 至 0.45（YZ-XT）和 0.27 至 0.53（IPS），并且随着厚度的增加而减小。
结论
根据本研究的结果，氧化锆陶瓷的微观结构、物理和光学性能受化学成分和烧结参数变化的影响。
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