Rohr Nadja, Schönenberger Angela Jacqueline, Fischer Jens
Biomaterials and Technology, Department of Reconstructive Dentistry, University Center for Dental Medicine Basel UZB, University of Basel, CH-4058 Basel, Switzerland.
Materials (Basel). 2023 Jan 18;16(3):910. doi: 10.3390/ma16030910.
The aim was to investigate how the surface treatment and the process of accelerated ageing of zirconia for dental implants affect the biaxial flexural strength and hardness. Zirconia discs with a diameter of 12.6 mm were subjected to either one of the following treatments: polishing (Zp); polishing and heat treatment at 1250 °C for 1 h (Zpt); machining (Zm); machining and heat treatment (Zmt); or sandblasting, acid-etching, and heat treatment (Z14) (n = 45 per group). Biaxial flexural strength and Martens hardness (HM) were measured without further treatment and after accelerated ageing for 5 h or 5 × 5 h according to ISO 13356 (n = 15 per group). Two-way ANOVA was applied to test the effect of surface treatment and ageing (α = 0.05). The reliability of the specimens was described with Weibull two-parameter distribution of biaxial flexural strength data. Overall, the surface treatment ( < 0.001) and ageing ( = 0.012) revealed a significant effect on biaxial flexural strength values, while HM was only affected by the surface treatment ( < 0.001) but not ageing ( = 0.160). Surface treatment significantly affected HM ( < 0.001) but not ageing ( = 0.160). The applied surface treatments affected the biaxial flexural strength and HM of zirconia. For accelerated ageing, a duration of both 5 h and 5 × 5 h is recommended to evaluate the effect of surface treatments. Zm was the most reliable surface as it was least affected by ageing and provided low standard deviations of biaxial flexural strength values.
本研究旨在探讨牙科种植体用氧化锆的表面处理及加速老化过程如何影响其双轴弯曲强度和硬度。直径为12.6毫米的氧化锆圆盘接受以下处理之一：抛光（Zp）；在1250°C下抛光并热处理1小时（Zpt）；机械加工（Zm）；机械加工并热处理（Zmt）；或喷砂、酸蚀和热处理（Z14）（每组n = 45）。根据ISO 13356标准，在未经进一步处理以及加速老化5小时或5×5小时后，测量双轴弯曲强度和马氏硬度（HM）（每组n = 15）。采用双向方差分析来检验表面处理和老化的影响（α = 0.05）。用双轴弯曲强度数据的威布尔双参数分布来描述样本的可靠性。总体而言，表面处理（< 0.001）和老化（ = 0.012）对双轴弯曲强度值有显著影响，而HM仅受表面处理影响（< 0.001），不受老化影响（ = 0.160）。表面处理对HM有显著影响（< 0.001），但对老化无影响（ = 0.160）。所采用的表面处理影响氧化锆的双轴弯曲强度和HM。对于加速老化，建议采用5小时和5×5小时的时长来评估表面处理的效果。Zm是最可靠的表面处理方式，因为它受老化影响最小，且双轴弯曲强度值的标准差较低。
