将介孔生物活性玻璃用于修复酸蚀的牙釉质,样品经模拟刷牙后,浸泡在自然唾液中.通过X射线衍射(XRD)、扫描电镜(SEM)、聚焦离子束(FIB)切割后透射电镜(TEM)观察、X射线能谱分析(EDX)、选区电子衍射(SAED)分析,及纳米压痕力学测试等表征显示,经过介孔生物活性玻璃处理后的牙釉质,在唾液中浸泡6h,牙釉质表面形成棒状类骨磷灰石;浸泡24 h,表面形成均匀矿化层,厚度约为100 nm,且和牙釉质基体结合紧密,钙磷比接近牙釉质基体.矿化层在300 μN作用下,出现划痕爆破值,其显微力学性能为(3.37±0.62) GPa,弹性模量为(60.48±4.56) GPa,均达到未酸蚀牙釉质的75％.实验结果表明,介孔生物活性玻璃可较快地诱导矿化,有望用于酸蚀牙釉质修复及早期龋齿的预防.
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