精氨酸牙膏对釉质早期龋再矿化作用的研究

Effect of arginine dentifrice on remineralization of initial enamel carious lesions

目的研究精氨酸牙膏对人牙釉质早期龋的再矿化效果。方法制备人牙釉质龋标本,随机分为3组:空白组(去离子水处理),对照组(普通市售含氟牙膏处理,含质量分数0.14%单氟磷酸钠),实验组(精氨酸牙膏处理,含质量分数0.14%单氟磷酸钠和8%精氨酸)。经体外pH循环10 d,测量pH循环前后各组样本的表面显微硬度,计算其差值;并通过偏光显微镜观察各组样本再矿化前后的形态学改变。pH循环结束后,脱矿处理2 h,测量其表面显微硬度,计算与pH循环前的差值,评估再矿化处理对釉质抗酸能力的影响。采用酸蚀法测定各组的氟摄入量。结果与对照组和空白组比较,实验组釉质表面的显微硬度、抗酸能力,以及氟摄入量均明显升高。偏光显微镜下观察,实验组病损深度明显变浅,且有表层下再矿化条带,而空白组与对照组病损无明显变化。结论精氨酸牙膏能有效促进人牙釉质龋表层及表层下再矿化,在早期龋的防治领域具有较大的临床应用前景。

Objective To evaluate remineralization efficacy of an arginine containing dentifrice on initial enamel carious lesions in vitro. Methods Human enamel blocks with early lesions were prepared and randomly divided into three treatment groups： negative control group （distilled and deionized water）, positive control group （fluoride containing dentifrice and 0.14% sodium monofluorophosphate）, and test dentifrice group （8.0% arginine and 0.14% sodium monofluorophosphate）. The lesions were subjected to a pH-cycling regime for 10 days. Surface enamel microhardness of the enamel blocks from each group was measured before and after pH cycling, and the surface microhardness recovery was calculated. Then, specimens were analyzed for enamel fluoride uptake （EFU） through acid etching method, after which they were treated in demineralization solution for a 2 h period of acid challenge. The other specimens were sectioned and examined through polarized light microscopy. Results In the test dentifrice group, microhardness recovery and EFU were significantly higher than those in the negative control and positive groups. The test dentifrice group was significantly resistant to the acid challenge compared with the other groups. Conspicuous remineralization of enamel subsurface lesions was observed under polarized light microscopy among samples treated with test dentifrice, whereas the control groups showed no significant changes on enamel subsurface lesions. Conclusion This study presents the potential superiority of Pro-Argin dentifrice over conventional fluoride dentifrice in promoting the remineralization of initial enamel lesions.