目的：体外研究氟化钠涂膜对放射线照射后釉质超微结构的影响。
The samples of each group were treated by 30Gy X-ray irradiation and the ultrastructures were investigated by SEM.
结论：使用氟化钠涂膜与氟化钠溶液相比氟离子与牙釉质接触和反应的时间更长，有效地降低脱矿，提高牙釉质抗酸溶解性。
Conclusion: The time of NaF varnish contact and reaction with enamel was longer than NaF solution to increase acid-resistance and reduce demineralization effectively.
氟化钠破坏金属晶格形成微小的蜂窝状结构，从而便于涂膜嵌入其中，达到增强涂膜附着力的目的。
Sodium fluoride destroys metal crystalline grain forming the small cellular structure it convenient for membrane imbed among them.
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