Hjerppe Jenni, Närhi Timo O, Vallittu Pekka K, Lassila Lippo V J
Assistant Professor, Department of Prosthetic Dentistry, University of Turku, Turku, Finland.
Professor, Department of Prosthetic Dentistry, University of Turku, Turku, Finland; and Professor, Clinic of Oral Diseases, Turku University Central Hospital, Turku, Finland.
J Prosthet Dent. 2016 Oct;116(4):577-583. doi: 10.1016/j.prosdent.2016.02.018. Epub 2016 May 5.
Different surface treatments are commonly used during the fabrication of zirconia fixed dental prostheses. However, such treatments can affect the properties of the zirconia framework material.
The purpose of this in vitro study was to determine the effect of different surface treatments on the surface roughness and flexural and bend strength of zirconia.
Seventy-two zirconia disks (n=8) and 72 zirconia bars (n=8) were sintered and divided into 9 groups for different surface treatments: sintered control, airborne-particle abraded with 50-μm aluminum oxide, airborne-particle abraded with Rocatec soft (30 μm), airborne-particle abraded with Rocatec (105 μm), grinding dry with a micromotor, turbine grinding under water cooling, grinding with silicon carbide paper, diamond paste polishing, and steam cleaning. The biaxial flexural strength of the disks (diameter 19 mm, thickness 1.6 mm) and 3-point bend test of the bars (thickness 2 mm, height 2 mm, length 25 mm) were measured dry at room temperature. One-way ANOVA followed by the Tukey HSD test (α=.05) and Pearson correlation test were used for statistical analysis.
Airborne-particle abrasion and silicon carbide paper grinding increased the flexural and bend strength of zirconia specimens (P<.05). The 3-point bend test gave 20% to 30% higher strength values than the biaxial test, but a strong correlation was shown between the test types. Surface roughness had a statistically significant negative effect on the strength values in the 3-point bend test.
The surface treatments tested affected the strength and surface roughness of zirconia framework material.
在氧化锆固定义齿制作过程中，通常会采用不同的表面处理方法。然而，这些处理方法会影响氧化锆框架材料的性能。
本体外研究的目的是确定不同表面处理对氧化锆表面粗糙度、挠曲强度和弯曲强度的影响。
将72个氧化锆圆盘（n = 8）和72根氧化锆棒（n = 8）烧结后分为9组进行不同的表面处理：烧结对照、用50μm氧化铝进行空气颗粒研磨、用Rocatec soft（30μm）进行空气颗粒研磨、用Rocatec（105μm）进行空气颗粒研磨、用微型电机干磨、水冷涡轮研磨、用碳化硅纸研磨、金刚石膏抛光和蒸汽清洗。在室温下干燥测量圆盘（直径19mm，厚度1.6mm）的双轴挠曲强度和棒（厚度2mm，高度2mm，长度25mm）的三点弯曲试验。采用单因素方差分析，随后进行Tukey HSD检验（α = 0.05）和Pearson相关检验进行统计分析。
空气颗粒研磨和碳化硅纸研磨提高了氧化锆试件的挠曲强度和弯曲强度（P < 0.05）。三点弯曲试验的强度值比双轴试验高20%至30%，但两种试验类型之间显示出强相关性。在三点弯曲试验中，表面粗糙度对强度值有统计学上的显著负面影响。
所测试的表面处理影响了氧化锆框架材料的强度和表面粗糙度。
