Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, 15 Kanchanavanich, Hat Yai, Songkhla 90112, Thailand.
Dent Mater J. 2010 Oct;29(5):502-11. doi: 10.4012/dmj.2009-111. Epub 2010 Sep 4.
This study was conducted to evaluate the titratable acidity and effect of naturally acidic agents on the surface microhardness, elemental composition, and surface morphology of fluorapatite-leucite ceramics. One hundred and ten ceramic disks (IPS d.SIGN), 12.0 mm in diameter and 2.0 mm in thickness, were fabricated. Before immersion, the baseline data of Vickers microhardness and elemental composition were recorded. Four groups were immersed in acidic agents (citrate buffer solution, green mango juice, and pineapple juice) and deionized water (control) at 37ºC for 168 hours, whereas one group was immersed in 4% acetic acid at 80ºC for 168 hours. After immersion, specimens were evaluated and data were analyzed using one-way repeated ANOVA and Tukey's test (α=0.05). Microhardness values significantly decreased after immersion (p<0.05). In terms of elemental composition, the weight percentages of silicon, potassium, aluminum, and sodium also decreased after immersion (p<0.05). Results of this study showed that fluorapatite-leucite ceramics were affected by long-term immersion in acidic agents.
本研究旨在评估可滴定酸度以及天然酸性剂对氟磷灰石-锂辉石陶瓷表面显微硬度、元素组成和表面形貌的影响。制备了 110 个直径为 12.0 毫米、厚度为 2.0 毫米的陶瓷圆盘（IPS d.SIGN）。在浸泡之前，记录维氏显微硬度和元素组成的基线数据。将四个组分别浸泡在酸性剂（柠檬酸盐缓冲溶液、青芒果汁和菠萝汁）和去离子水中（对照组）中，在 37°C 下浸泡 168 小时，而另一组在 80°C 下浸泡在 4%乙酸中 168 小时。浸泡后，使用单向重复方差分析和 Tukey 检验（α=0.05）对样品进行评估和数据分析。浸泡后显微硬度值显著降低（p<0.05）。就元素组成而言，硅、钾、铝和钠的重量百分比也在浸泡后降低（p<0.05）。本研究结果表明，氟磷灰石-锂辉石陶瓷长期浸泡在酸性剂中会受到影响。
