Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
Acta Odontol Scand. 2010 Jan;68(1):1-10. doi: 10.3109/00016350903251321.
To evaluate the microhardness and surface elemental compositions of ceramics immersed in acidic agents.
Thirty-five ceramic disc specimens were made from each of four types of ceramic (VMK 95, Vitadur Alpha, Empress Esthetic and IPS e.max Ceram). Before immersion, baseline data of Vicker's microhardness and elemental composition were recorded. Four groups of discs (seven per group) were then immersed in acidic agents (citrate buffer solution, pineapple juice and green mango juice) and deionized water (as a control) for 168 h at 37 degrees C. One group was immersed in 4% acetic acid at 80 degrees C for 168 h. After immersion, specimens were evaluated and data were analyzed using two-way ANOVA with repeated measurements and a paired t-test at a significance level of 0.05.
The microhardness values of four types of ceramic significantly decreased after being immersed in acidic agents (p < 0.05). The elemental compositions of ceramics mainly comprise silicon, aluminium and potassium. These compositions also decreased after immersion (p < 0.05).
The acidic agents used in this study affected the microhardness and elemental dissolution of ceramics. The main elemental compositions of ceramics (silicon, aluminium and potassium) decreased after being immersed in acidic agents.
评估浸泡于酸性剂中的陶瓷的显微硬度和表面元素组成。
从四种陶瓷（VMK95、Vitadur Alpha、Empress Esthetic 和 IPS e.max Ceram）中各制作 35 个陶瓷圆片标本。在浸泡之前，记录维氏显微硬度和元素组成的基线数据。然后将四组圆片（每组七个）分别浸泡于酸性剂（柠檬酸盐缓冲溶液、菠萝汁和青芒果汁）和去离子水中（作为对照），在 37°C 下浸泡 168 小时。一组浸泡于 4%的醋酸中，在 80°C 下浸泡 168 小时。浸泡后，使用具有重复测量的双因素方差分析和配对 t 检验，在 0.05 的显著性水平下评估标本并分析数据。
四种陶瓷的显微硬度值在浸泡于酸性剂后显著降低（p<0.05）。陶瓷的主要元素组成包括硅、铝和钾。这些元素在浸泡后也减少了（p<0.05）。
本研究中使用的酸性剂影响了陶瓷的显微硬度和元素溶解。陶瓷的主要元素组成（硅、铝和钾）在浸泡于酸性剂后减少了。
