喷砂对高透明度氧化锆弯曲强度的影响。
Impact of sandblasting on the flexural strength of highly translucent zirconia.
机构信息
Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
出版信息
J Mech Behav Biomed Mater. 2021 Mar;115:104268. doi: 10.1016/j.jmbbm.2020.104268. Epub 2020 Dec 13.
The objective of this study was to assess the influence of alumina sandblasting on the flexural strength of the latest generation of highly translucent yttria partially stabilized dental zirconia (Y-PSZ). Fully-sintered zirconia disk-shaped specimens (14.5-mm diameter; 1.2-mm thickness) of four Y-PSZ zirconia grades (KATANA HT, KATANA STML, KATANA UTML, all Kuraray Noritake; and Zpex Smile, Tosoh) were sandblasted at 0.2 MPa with 50-μm alumina (AlO) sand (Kulzer) or left as-sintered (control). For each zirconia grade, the yttria (YO) content was determined using X-ray fluorescence (XRF). Surface roughness was assessed using 3D confocal laser microscopy. Micro-Raman spectroscopy (μ-Raman) and X-ray diffraction (XRD) were used to assess potentially induced residual stresses. Biaxial flexural strength (n = 20) was statistically compared by Weibull analysis. Focused ion beam - scanning electron microscopy (FIB/SEM) was used to observe the subsurface microstructure. Fracture surfaces after biaxial flexural strength testing were observed by SEM. KATANA UTML had the highest YO content (6 mol%), followed by KATANA STML and Zpex Smile (5 mol%), and KATANA HT (4 mol%). AlO-sandblasting significantly increased surface roughness of KATANA UTML and Zpex Smile. μRaman and XRD revealed the presence of residual compressive stress on all AlO-sandblasted surfaces. FIB/SEM revealed several sub-surface microcracks in the sandblasted specimens. Weibull analysis revealed that AlO-sandblasting increased the characteristic strength of KATANA HT, KATANA STML, whereas it decreased the strength of KATANA UTML. The strength enhancement after AlO-sandblasting of KATANA HT was the highest, followed by KATANA STML. For Zpex Smile, the influence was statistically insignificant. The impact of AlO-sandblasting on the Weibull modulus was controversial. The strength of zirconia after AlO-sandblasting is determined by the balance between microcrack formation (decreased strength) and surface compressive stress build-up (increased strength).
本研究旨在评估氧化铝喷砂对最新一代高透光性氧化钇部分稳定氧化锆（Y-PSZ）的抗弯强度的影响。四种 Y-PSZ 氧化锆等级（均来自 Kuraray Noritake 的 KATANA HT、KATANA STML、KATANA UTML 和 Zpex Smile、Tosoh）的全烧结氧化锆圆盘状试件（直径 14.5mm，厚度 1.2mm）在 0.2MPa 下用 50μm 氧化铝（AlO）喷砂（Kulzer）喷砂或保持烧结状态（对照）。对于每种氧化锆等级，使用 X 射线荧光（XRF）确定氧化钇（YO）含量。使用 3D 共聚焦激光显微镜评估表面粗糙度。使用微拉曼光谱（μ-Raman）和 X 射线衍射（XRD）评估潜在诱导的残余应力。通过威布尔分析对双轴抗弯强度（n=20）进行统计学比较。使用聚焦离子束-扫描电子显微镜（FIB/SEM）观察亚表面微观结构。通过 SEM 观察双轴抗弯强度测试后的断裂表面。KATANA UTML 的 YO 含量最高（6mol%），其次是 KATANA STML 和 Zpex Smile（5mol%），KATANA HT（4mol%）。氧化铝喷砂显著增加了 KATANA UTML 和 Zpex Smile 的表面粗糙度。μ-Raman 和 XRD 显示所有氧化铝喷砂表面均存在残余压应力。FIB/SEM 显示喷砂试件中有几个亚表面微裂纹。威布尔分析表明，氧化铝喷砂提高了 KATANA HT、KATANA STML 的特征强度，而降低了 KATANA UTML 的强度。KATANA HT 经氧化铝喷砂后的强度增强最大，其次是 KATANA STML。对于 Zpex Smile，影响无统计学意义。氧化铝喷砂对威布尔模数的影响存在争议。氧化铝喷砂后氧化锆的强度取决于微裂纹形成（强度降低）和表面压应力增加（强度增加）之间的平衡。
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