Skienhe Hasan, Habchi Roland, Ounsi Hani F, Ferrari Marco, Salameh Ziad
Doctoral School of Science and Technology, Lebanese University, Beirut, Lebanon, Phone: +9613600991, e-mail:
Department of Nanosciences and Nanotechnology. Campus Pierre Gemayel, Fanar, Lebanese University.
J Contemp Dent Pract. 2018 Feb 1;19(2):156-165. doi: 10.5005/jp-journals-10024-2230.
The aim of this study was to evaluate the effect of different surface treatments on roughness, grain size, and phase transformation of presintered zirconia.
Surface treatments included airborne particle abrasion (APA) before and after sintering with different particles shape, size, and pressure (50 μm AlO, 50 μm glass beads, and ceramic powder). Thirty-five square-shaped presin-tered yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic slabs (Zenostar ZR bridge, Wieland) were prepared (4 mm height × 10 mm width × 10 mm length) and polished with silicon carbide grit papers #800, 1000, 1200, 1500, and 2000 to ensure identical initial roughness. Specimens were divided into five groups according to surface treatment: group I (control): no surface treatment; group II: APA 50 μm AlO after sintering; group III: APA 50 μm AlO particles before sintering; group IV: APA 50 μm glass bead particles before sintering; and group V: APA ceramic powder before sintering. Specimens were analyzed using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) analyses, and tested for shear bond strength (SBS). Data were statistically analyzed using one-way analysis of variance (ANOVA) followed by post hoc tests for multiple comparisons Tukey's test (a > 0.05).
Air abrasion before sintering significantly increased the surface roughness when compared with groups I and III. The highest tetragonal to monoclinic (t-m) phase transformation (0.07%) was observed in group III, and a reverse transformation was observed in presintered groups (0.01%). Regarding bond strength, there was a significant difference between APA procedures pre- and postsintering.
Air abrasion before sintering is a valuable method for increasing surface roughness and SBS. The abrasive particles' size and type used before sintering had a little effect on phase transformation.
Air abrasion before sintering could be supposed to be an alternative surface treatment method to air abrasion after sintering.
本研究旨在评估不同表面处理对预烧结氧化锆的粗糙度、晶粒尺寸和相变的影响。
表面处理包括在烧结前后进行气载颗粒研磨（APA），使用不同形状、尺寸和压力的颗粒（50μm氧化铝、50μm玻璃珠和陶瓷粉末）。制备了35块方形预烧结钇稳定四方氧化锆多晶体（Y-TZP）陶瓷板（Zenostar ZR桥，Wieland）（4mm高×10mm宽×10mm长），并用800、1000、1200、1500和2000号碳化硅砂纸进行抛光，以确保相同的初始粗糙度。根据表面处理将标本分为五组：第一组（对照组）：未进行表面处理；第二组：烧结后使用50μm氧化铝进行APA处理；第三组：烧结前使用50μm氧化铝颗粒进行APA处理；第四组：烧结前使用50μm玻璃珠颗粒进行APA处理；第五组：烧结前使用APA陶瓷粉末进行处理。使用扫描电子显微镜（SEM）、原子力显微镜（AFM）、X射线衍射（XRD）分析对标本进行分析，并测试剪切粘结强度（SBS）。数据采用单因素方差分析（ANOVA）进行统计分析，随后进行多重比较的事后检验Tukey检验（α>0.05）。
与第一组和第三组相比，烧结前的气磨显著增加了表面粗糙度。在第三组中观察到最高的四方相向单斜相（t-m）相变（0.07%），而在预烧结组中观察到反向相变（0.01%）。关于粘结强度，烧结前后的APA程序之间存在显著差异。
烧结前的气磨是增加表面粗糙度和SBS的一种有价值的方法。烧结前使用的磨料颗粒的尺寸和类型对相变影响较小。
烧结前的气磨可被认为是烧结后气磨的一种替代表面处理方法。
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