Department of Prosthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
Department of Textile Engineering, Erciyes University, Kayseri, Turkey.
J Indian Prosthodont Soc. 2023 Jan-Mar;23(1):57-64. doi: 10.4103/jips.jips_345_22.
The purpose of the present study was to examine the optical properties, chemical composition, and grain size (GS) of monolithic zirconia (MZ) ceramic at different thicknesses sintered using different procedures after hydrothermal aging.
An in vitro study.
Forty MZ discs (0.5-mm thickness [Group-0.5] and 1-mm thickness [Group-1]; 12 mm diameter) were milled and divided according to standard (Group-ST) and speed (Group-SP) sintering procedures. All specimens were hydrothermally aged at 134°C after sintering. Translucency (TP), opalescence (OP), and fluorescence (ΔE-FL) parameters were calculated using the color coordinates (LFNx01, aFNx01, bFNx01, respectively) of the discs. The chemical composition and the GS of the specimens were characterized using X-ray fluorescence spectroscopy and a scanning electron microscopy, respectively.
TPs and ΔE-FLs were analyzed using independent samples t-tests and Mann-Whitney U-tests while a two-way analysis of variance (ANOVA) was used for OPs.
Group-1 showed significantly lower TP than Group-0.5 (P < 0.001) but a significantly higher OP (P = 0.014). Group-SP showed significantly higher OP (P = 0.00003) and ΔE-FL (P = 0.0026) values than Group-ST without considering the thickness. Group-SP (0.29 ± 0.119 μm) had a smaller GS than Group-ST (0.306 ± 0.142 μm). Compared to Group-ST, Group-SP had a lower percentage of YO and a higher percentage of AlO.
The effect of the sintering procedure on TP and OP of MZ was not perceived by the naked eye. The speed sintering procedure may increase Δ E-FL of MZ to higher values than natural teeth when compared with standard sintering. The speed sintering may cause minor changes in GS and the chemical composition of MZ.
本研究旨在探讨不同厚度的整体氧化锆（MZ）陶瓷在不同烧结程序下经过水热老化后的光学性能、化学成分和晶粒尺寸（GS）。
体外研究。
将 40 个 MZ 圆盘（0.5mm 厚度[组-0.5]和 1mm 厚度[组-1]；直径 12mm）研磨并根据标准（组-ST）和速度（组-SP）烧结程序进行分组。所有标本在烧结后均在 134°C 下水热老化。使用圆盘的颜色坐标（LFNx01、aFNx01、bFNx01 分别）计算半透明度（TP）、乳光（OP）和荧光（ΔE-FL）参数。使用 X 射线荧光光谱和扫描电子显微镜分别对样品的化学成分和 GS 进行了表征。
使用独立样本 t 检验和曼-惠特尼 U 检验分析 TPs 和ΔE-FLs，而使用双向方差分析（ANOVA）分析 OPs。
与组-0.5 相比，组-1 的 TP 明显较低（P < 0.001），但 OP 明显较高（P = 0.014）。与不考虑厚度的组-ST 相比，组-SP 的 OP（P = 0.00003）和ΔE-FL（P = 0.0026）值明显更高。组-SP（0.29 ± 0.119μm）的 GS 小于组-ST（0.306 ± 0.142μm）。与组-ST 相比，组-SP 的 YO 百分比较低，AlO 百分比较高。
烧结程序对 MZ 的 TP 和 OP 的影响肉眼无法察觉。与标准烧结相比，高速烧结程序可能会使 MZ 的ΔE-FL 增加到高于天然牙齿的值。高速烧结可能会导致 MZ 的 GS 和化学成分发生微小变化。
