Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
J Biomed Mater Res B Appl Biomater. 2009 Nov;91(2):930-937. doi: 10.1002/jbm.b.31477.
The aim of this study was to evaluate the influence of surface grinding and sandblasting on surface roughness, phase chances, and biaxial flexural strength of yttria-stabilized tetragonal zirconia (Y-TZP) materials. Thirty disk specimens of Cercon (C), DentaCAD (DC), Zirkonzahn (ZZ) were fabricated. The specimens were divided into three groups according to surface treatment (control, ground, and sandblasted). Surface roughness was measured, and X-ray diffraction analysis was performed. Finally, biaxial flexural strength was determined. The data was analyzed by two-way ANOVA. Weibull statistics was used to analyze the variability of strength. The effects of surface treatments on surface roughness values were different for each material. X-ray diffraction analysis revealed that control groups of C and ZZ were composed of tetragonal zirconia. Relative amount of monoclinic zirconia (SD) was 7.366 (0.716)% in the DC control group. In all materials, transformation occurred after treatments. Grinding decreased and sandblasting increased the strength of control groups in all materials. Ground C and DC specimens had higher Weibull modulus than control groups while lower m was found for ground ZZ. Sandblasting, resulted in lower m compared with grinding for all materials although increased strength. The roughness and crystalline phase of Y-TZP materials were influenced by surface treatments. Biaxial flexural strength of materials decreased after grinding and increased after sandblasting. The low m of sandblasted groups may indicate further weakening of the materials, resulting in unexpected failures.
本研究旨在评估表面研磨和喷砂处理对氧化钇稳定四方氧化锆（Y-TZP）材料表面粗糙度、相变化和双轴弯曲强度的影响。制作了 30 个 Cercon（C）、DentaCAD（DC）、Zirkonzahn（ZZ）的圆盘试件。根据表面处理（对照、研磨和喷砂）将试件分为三组。测量表面粗糙度并进行 X 射线衍射分析。最后，确定双轴弯曲强度。数据通过双向方差分析进行分析。威布尔统计用于分析强度的变异性。表面处理对每种材料的表面粗糙度值的影响不同。X 射线衍射分析表明，C 和 ZZ 的对照组成分为四方氧化锆。DC 对照组成中四方氧化锆的相对含量为 7.366（0.716）%。在所有材料中，处理后都发生了相变。研磨降低了所有材料对照组成的强度，而喷砂则提高了强度。研磨后的 C 和 DC 试件的威布尔模数高于对照组成，而 ZZ 的研磨试件的 m 值较低。与研磨相比，喷砂处理虽然提高了强度，但所有材料的 m 值都较低。Y-TZP 材料的粗糙度和晶体相受表面处理的影响。研磨后材料的双轴弯曲强度降低，喷砂后强度增加。喷砂组的低 m 值可能表明材料进一步弱化，导致意外失效。
