循环浸泡蚀剂作用下氟磷灰石-助熔剂和氟磷灰石瓷的弯曲强度
Flexural strength of fluorapatite-leucite and fluorapatite porcelains exposed to erosive agents in cyclic immersion.
机构信息
Section of Dental Public Health, Huay Yod Hospital, Trang, Thailand.
出版信息
J Appl Oral Sci. 2011 Apr;19(2):95-9. doi: 10.1590/s1678-77572011000200003.
OBJECTIVE
The aim of this study was to evaluate the flexural strength of two porcelain materials (IPS d.SIGN and IPS e.max Ceram) exposed to erosive agents.
MATERIAL AND METHODS
One hundred and twenty bar-shaped specimens were made from each of fluorapatite-leucite porcelain (IPS d.SIGN) and fluorapatite porcelain (IPS e.max Ceram) and divided into 8 groups of 15 specimens each. Six groups were alternately immersed in the following storage agents for 30 min: deionized water (control), citrate buffer solution, pineapple juice, green mango juice, cola soft drink and 4% acetic acid. Then, they were immersed for 5 min in deionized water at 37ºC. Seven cycles were completed, totalizing 245 min. A 7th group was continuously immersed in 4% acetic acid at 80ºC for 16 h. The final, 8th, group was stored dry at 37ºC for 245 min. Three-point bending tests were performed in a universal testing machine. The data were analyzed statistically by 2-way ANOVA, Tukey's HSD test and t-test at significance level of 0.05.
RESULTS
The flexural strengths of all groups of each porcelain after exposure to erosive agents in cyclic immersion did not differ significantly (p>0.05). For both types of porcelain, dry storage at 37ºC yielded the highest flexural strength, though without significant difference from the other groups (p>0.05). The flexural strengths of all groups of fluorapatite porcelains were significantly higher (p<0.05) than those of the fluorapatite-leucite porcelains.
CONCLUSIONS
This study demonstrated that the erosive agents evaluated did not affect the flexural strength of the tested dental porcelains.
目的
本研究旨在评估两种瓷材料（IPS d.SIGN 和 IPS e.max Ceram）在暴露于侵蚀剂后的弯曲强度。
材料和方法
从氟磷灰石-堇青石瓷（IPS d.SIGN）和氟磷灰石瓷（IPS e.max Ceram）中各制作 120 个条形试件，并将其分为 8 组，每组 15 个试件。将其中 6 组试件交替浸入以下储存剂中 30 分钟：去离子水（对照）、柠檬酸盐缓冲液、菠萝汁、绿芒果汁、可乐软饮料和 4%乙酸。然后，将它们在 37°C 的去离子水中浸泡 5 分钟。完成 7 个循环，总时长 245 分钟。第 7 组持续在 80°C 的 4%乙酸中浸泡 16 小时。第 8 组试件在 37°C 下干燥储存 245 分钟。在万能试验机上进行三点弯曲试验。使用双因素方差分析、Tukey HSD 检验和 t 检验对数据进行统计学分析，显著性水平为 0.05。
结果
暴露于循环浸泡侵蚀剂后的两种瓷的所有组的弯曲强度均无显著差异（p>0.05）。对于两种类型的瓷，37°C 下的干燥储存产生的弯曲强度最高，但与其他组无显著差异（p>0.05）。所有氟磷灰石瓷组的弯曲强度均显著高于氟磷灰石-堇青石瓷组（p<0.05）。
结论
本研究表明，所评估的侵蚀剂不会影响测试用牙科瓷的弯曲强度。
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