Abstract: Objective: To observe the micro structure of the infiltrating resin bonded on the decalcified enamel. Methods: Twelve extracted human molars were collected and divided into 2 groups. The enamel of the teeth was healthy in one group and the enamel was decalcified in the other group. The decalcification model of the enamel was manually established, and then the infiltrating resin was applied on the surface of the decalcified enamel. The enamel before or after etched by hydrochloric acid gel and the adhesive interfaces of the resin and the enamel were observed using scanning electron microscope (SEM). Results: The depth of decalcification was only about 10 μm on the surface of the enamel of healthy teeth. The calcifying layer on the surface of decalcified enamel can be cleaned by the hydrochloric acid gel thoroughly, which facilitated the infiltrating resin penetrating into the decalcified enamel adequately. However, there were several intervals between the resin tags and the body of enamel. Conclusion: The infiltrating resin could penetrate into the micro-structure of decalcified enamel and form the reticular structure on the surface of the enamel which could seal the decalcified enamel.

Key words: Infiltrating resin, Decalcified enamel, Scanning electron microscope