Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Germany; Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Egypt.
Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Germany.
J Prosthodont Res. 2018 Apr;62(2):210-217. doi: 10.1016/j.jpor.2017.09.001. Epub 2017 Oct 9.
This study evaluated the effect of surface treatment of zirconia in pre-sintered and post-sintered stages on its surface roughness, phase transformation, and biaxial flexural strength (BFS).
Zirconia ceramic discs (n=40) having a final dimensions of 12mm diameter and 1.2mm thickness were milled then divided into three main groups according to the type of surface treatment performed (Group 1 (n=16); air-abrasion using AlO particles, Group 2 (n=16); silica coating using Rocatec soft, and Group 3 (n=8); a control group receiving no surface treatment). Groups 1 and 2 were divided into two subgroups each according to the stage in which the surface treatment was performed (Subgroup A; surface treatment performed in the pre-sintered stage and subgroup B; surface treatment performed in the post-sintered stage). Surface roughness, phase transformation, and biaxial flexural strength (BFS) were later assessed. Data was then analyzed using two-way ANOVA and Tukey post-hoc tests at a significance level of p≤0.05.
Subgroups treated in the pre-sintered stage showed higher mean Ra in μm (1.81±0.36) when compared to the subgroups treated in the post-sintered (0.68±0.07) stage and the control group (0.51±0.10) (p≤0.05). The pre-sintered treated group and the control showed no monoclinic phase while the post-sintered group showed significantly higher portions of monoclinic phase. Regarding BFS the post-sintered treated group had statistically significant higher values in MPa (1228±81) when compared to the pre-sintered treated group (940±101) and the control (1019±82) (p≤0.05).
Air abrasion in the pre-sintered stage might be a promising surface treatment method to produce promising surface roughness values of zirconia without subjecting it to early degradation.
本研究评估了预烧结和后烧结阶段对氧化锆表面粗糙度、相转变和双轴弯曲强度（BFS）的影响。
将具有最终尺寸为 12mm 直径和 1.2mm 厚度的氧化锆陶瓷圆盘（n=40）铣削，然后根据所进行的表面处理类型分为三个主要组（组 1（n=16）；使用 AlO 颗粒进行空气喷砂，组 2（n=16）；使用 Rocatec 软质进行二氧化硅涂层，组 3（n=8）；对照组未进行表面处理）。组 1 和 2 各自根据表面处理进行的阶段分为两个亚组（亚组 A；在预烧结阶段进行表面处理，亚组 B；在烧结后阶段进行表面处理）。随后评估表面粗糙度、相转变和双轴弯曲强度（BFS）。然后使用双因素方差分析和 Tukey 事后检验在 p≤0.05 的显着性水平下分析数据。
与在烧结后阶段处理的亚组（0.68±0.07）和对照组（0.51±0.10）相比，在预烧结阶段处理的亚组显示出更高的平均 Ra（1.81±0.36）μm（p≤0.05）。预烧结处理组和对照组均未显示单斜相，而后烧结组显示出明显更高比例的单斜相。关于 BFS，与预烧结处理组（940±101）和对照组（1019±82）相比，后烧结处理组具有统计学上更高的 MPa 值（1228±81）（p≤0.05）。
在预烧结阶段进行空气喷砂可能是一种有前途的表面处理方法，可以在不对氧化锆进行早期降解的情况下产生有前途的表面粗糙度值。
