Occlusal cavity: When filling the occlusal cavity, the filling material with high compressive strength, hard material and good wear resistance should be selected, such as amalgam or composite resin for posterior teeth. The latter has two different colors of materials, one is high-strength posterior tooth filling material, the color is like amalgam; The other is photosensitive composite resin material for posterior teeth, which is the same color as teeth.

Shallow cavities: filling shallow cavities. In the past, amalgam was mainly used to repair defects, but now dental filling materials such as photosensitive composite resin or glass ionomer cement can be used. If there is a denture clasp near the filling of the tooth neck, it is best to choose photosensitive composite resin to fill it. The incised corner defect of anterior teeth was filled with composite resin material.

Middle cavity: attention should be paid to dentin hypersensitivity when filling middle cavity. In order to distinguish the degree of dentin hypersensitivity, a probe can be used to detect the dentin surface in the cavity. If dentin hypersensitivity occurs, the middle filling material zinc phosphate cement powder should be used as the bottom, and then the outer filling material should be filled.

Deep pit: When filling deep pit, the internal filling material, namely zinc oxide clove oil cement powder, is generally used, and then a layer of intermediate material is covered, and finally the external filling material is used. However, it must be pointed out that the adjacent cavities of anterior teeth were successfully filled with zinc oxide clove oil cement, and composite resin could not be directly used. Because clove oil can

Destroy the polymerization of composite resin, resulting in poor sealing of filling material, loosening or falling off of filling material.