Objective

To assess the influence of alumina sandblasting on four highly translucent dental zirconia grades.

Methods

Fully sintered zirconia disk-shaped specimens (15-mm diameter; 0.5-mm thickness) of four highly translucent yttria partially stabilized zirconia (Y-PSZ) grades (KATANA HT, KATANA STML, KATANA UTML, Kuraray Noritake; Zpex Smile, Tosoh) were sandblasted with 50-μm alumina (Al₂O₃) sand (Kulzer) or left ‘as-sintered’ (control) (n = 5). For each zirconia grade, the translucency was measured using a colorimeter. Surface roughness was assessed using 3D confocal laser microscopy, upon which the zirconia grades were statistically compared for surface roughness using a Kruskal–Wallis test (n = 10). X-ray diffraction (XRD) with Rietveld analysis was used to assess the zirconia-phase composition. Micro-Raman spectroscopy was used to assess the potentially induced residual stress.

Results

The translucency of KATANA UTML was the highest (36.7 ± 1.8), whereas that of KATANA HT was the lowest (29.5 ± 0.9). The ‘Al₂O₃-sandblasted’ and ‘as-sintered’ zirconia revealed comparable surface-roughness Sa values. Regarding zirconia-phase composition, XRD with Rietveld analysis revealed that the ‘as-sintered’ KATANA UTML contained the highest amount of cubic zirconia (c-ZrO₂) phase (71 wt%), while KATANA HT had the lowest amount of c-ZrO₂ phase (41 wt%). KATANA STML and Zpex Smile had a comparable zirconia-phase composition (60 wt% c-ZrO₂ phase). After Al₂O₃-sandblasting, a significant amount (over 25 wt%) of rhombohedral zirconia (r-ZrO₂) phase was detected for all highly translucent zirconia grades.

Significance

Al₂O₃-sandblasting did not affect the surface roughness of the three highly translucent Y-PSZ zirconia grades, but it changed its phase composition.

中文翻译：

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喷砂高透明牙科氧化锆的晶体学和形态分析

客观的

评估氧化铝喷砂对四种高度半透明的牙科氧化锆品级的影响。

方法

四个高度半透明的氧化钇部分稳定的氧化锆（Y-PSZ）等级（KATANA HT，KATANA STML，KATANA UTML，Kuraray Noritake，Zpex Smile，Tosoh）完全烧结的氧化锆圆盘形试样（直径15毫米；厚度0.5毫米）用50μm氧化铝（Al ₂ O ₃）砂（Kulzer）喷砂或“烧结”（对照）（n = 5）。对于每个氧化锆等级，使用比色计测量半透明性。使用3D共聚焦激光显微镜评估表面粗糙度，然后使用Kruskal–Wallis检验（n = 10）对氧化锆等级的表面粗糙度进行统计学比较。采用Rietveld分析的X射线衍射（XRD）评估了氧化锆相的组成。用显微拉曼光谱法评估可能引起的残余应力。

结果

KATANA UTML的半透明性最高（36.7±1.8），而KATANA HT的半透明性最低（29.5±0.9）。“ Al ₂ O ₃喷砂”和“烧结”氧化锆显示出相当的表面粗糙度Sa值。关于氧化锆相组合物，用X射线衍射Rietveld分析，发现该“作为烧结” KATANA UTML含有立方氧化锆（最高量的Ç -ZrO ₂）相（71重量％），而KATANA HT有最低量的Ç - ZrO ₂相（41 wt％）。KATANA STML和Zpex Smile具有可比较的氧化锆相组成（60重量％的c -ZrO ₂相）。在Al ₂ O _3之后-喷砂处理时，对于所有高度半透明的氧化锆品级，都检测到大量（超过25 wt％）的菱面体氧化锆（r -ZrO ₂）相。

意义

Al ₂ O ₃喷沙处理不会影响三种高度半透明的Y-PSZ氧化锆牌号的表面粗糙度，但会改变其相组成。