Effect of sintering procedures on optical properties, chemical composition, and grain size of monolithic zirconia ceramic at different thicknesses after hydrothermal aging: An in vitro study.

IF 1 Q3 DENTISTRY, ORAL SURGERY & MEDICINE The Journal of Indian Prosthodontic Society Pub Date : 2023-01-01 DOI:10.4103/jips.jips_345_22

Haydar Albayrak, Ravza Eraslan, Ömer Aydinlioglu

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Abstract

Aim: 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.

Settings and design: An in vitro study.

Materials and methods: 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_abFNx01-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.

Statistical analysis used: TPs and ΔE_abFNx01-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.

Results: 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_abFNx01-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 Y₂O₃ and a higher percentage of Al₂O₃.

Conclusion: 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_FNx01ab-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.

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烧结程序对水热老化后不同厚度整体氧化锆陶瓷的光学特性、化学成分和晶粒大小的影响：体外研究。

目的：本研究旨在考察水热老化后采用不同程序烧结的不同厚度的整体氧化锆（MZ）陶瓷的光学特性、化学成分和晶粒尺寸（GS）：材料与方法：体外研究：按照标准烧结程序（ST 组）和快速烧结程序（SP 组）对 40 个 MZ 盘（0.5 毫米厚 [0.5 组] 和 1 毫米厚 [1 组]；直径 12 毫米）进行研磨和划分。烧结后，所有试样均在 134°C 下进行水热老化。利用圆片的色坐标（分别为 LFNx01、aFNx01 和 bFNx01）计算半透明（TP）、乳白（OP）和荧光（ΔEabFNx01-FL）参数。使用 X 射线荧光光谱仪和扫描电子显微镜分别对试样的化学成分和 GS 进行了表征：采用独立样本 t 检验和 Mann-Whitney U 检验对 TPs 和 ΔEabFNx01-FLs 进行分析，对 OPs 采用双向方差分析（ANOVA）：结果：1 组的 TP 明显低于 0.5 组（P < 0.001），但 OP 明显高于 0.5 组（P = 0.014）。在不考虑厚度的情况下，SP 组的 OP 值（P = 0.00003）和 ΔEabFNx01-FL 值（P = 0.0026）明显高于 ST 组。组-SP（0.29 ± 0.119 μm）的 GS 小于组-ST（0.306 ± 0.142 μm）。与组-ST 相比，组-SP 的 Y2O3 百分比较低，而 Al2O3 百分比较高：烧结程序对 MZ 的 TP 和 OP 的影响是肉眼无法感知的。与标准烧结法相比，快速烧结法可能会使 MZ 的 Δ EFNx01ab-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。

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