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材料和方法 选择氟浓度为0.03μg/ml和0.06μg/ml的天然牛奶两种,立即冷冻12h,然后复温加入红霉素至30μg/ml再冷冻,防止因细菌繁殖导致其pH下降。取牛切牙唇面直径为6mm的釉质圆片48片,磨平抛光,选择pH为4.6和5.0的两种酸作为脱矿液。实验分6组,每天均用5ml的脱矿液浸泡20h,除第一组(阴性对照组)外,其它各组每天还用1ml的牛奶或
MATERIALS AND METHODS Two natural milk samples with fluoride concentrations of 0.03μg / ml and 0.06μg / ml were selected and immediately frozen for 12h. Then erythromycin was added to 30μg / ml for re-freezing after rewarming to prevent the pH from decreasing due to bacterial growth. 48 pieces of enamel discs with 6 mm diameter and 6 mm diameter were polished and polished. The two acids with pH 4.6 and 5.0 were selected as the demineralized solution. The experiment was divided into 6 groups. Each group was immersed in 5 ml demineralized liquid for 20 hours every day. Except the first group (negative control group), the other groups used 1 ml of milk or