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首页> 外文期刊>Journal of dentistry >Evaluation of a 6% hydrogen peroxide tooth whitening gel on enamel and dentine microhardness in vitro.
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Evaluation of a 6% hydrogen peroxide tooth whitening gel on enamel and dentine microhardness in vitro.

机译：6％过氧化氢牙齿美白凝胶对牙釉质和牙本质显微硬度的体外评估。

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OBJECTIVES: The aims of this study were to evaluate the effects of a novel 6% hydrogen peroxide containing tooth whitener, Xtra White (XW), on enamel and dentine microhardness in vitro. METHODS: Polished human enamel and dentine specimens were prepared and baseline microhardness determined. In study 1, enamel specimens were exposed to 20 min cycles of either water, XW or Sprite Light for up to 28 cycles. In studies 2 and 3, enamel specimens were treated with 20 min cycles of either XW or water and exposed to whole saliva at all other times. In study 3, an additional exposure to a fluoride containing toothpaste was conducted. In total, 28 treatments were conducted in order to simulate a 2 weeks product use. In study 4, dentine specimens were treated as per study 3. Final microhardness measurements were taken and for studies 3 and 4 colour measurements were additionally taken. RESULTS: XW and water gave no statistically significant (p>0.05) changes in enamel and dentine microhardness after 28 treatments.Sprite Light gave a significant (p<0.00002) reduction in enamel microhardness after one 20 min treatment. XW showed significant bleaching of enamel and dentine specimens as compared to the water control. CONCLUSIONS: XW does not have any significant effect on enamel and dentine microhardness.
机译：目的：本研究的目的是评估一种新型的含6％双氧水的新型牙齿增白剂Xtra White（XW）对牙釉质和牙本质显微硬度的影响。方法：制备抛光的人类牙釉质和牙本质标本，并确定基线显微硬度。在研究1中，搪瓷样品暴露于水，XW或Sprite Light的20分钟循环中，最多暴露28个循环。在研究2和3中，对牙釉质标本进行了20分钟的XW或水处理，并在所有其他时间暴露于整个唾液。在研究3中，再次接触了含氟牙膏。为了模拟2周产品的使用，总共进行了28次处理。在研究4中，按照研究3处理牙本质标本。进行最终的显微硬度测量，并在研究3和4中另外进行颜色测量。结果：XW和水在28次处理后牙釉质和牙本质显微硬度无统计学意义（p> 0.05）的变化.Sprite Light在20分钟处理后牙釉质显微硬度的显着降低（p <0.00002）。与水对照相比，XW表现出牙釉质和牙本质样品的显着漂白。结论：XW对牙釉质和牙本质显微硬度没有明显影响。

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