When the tooth defect is excessive or the abutment surface has been destroyed, and the shape of the tooth body and the normal adjacency relationship cannot be restored by the filling treatment (the abnormal adjacency may cause food impaction), the inlay restoration may be selected. The inlay is a prosthesis embedded in the cavity of the tooth to restore the shape and function of the tooth defect.
The preparation steps are as follows: the teeth are first cut into a cavity of a certain shape, and according to the shape of the cavity, the restoration-inlay which is completely consistent with the cavity is made of different materials. After the inlay is properly tested, it is adhered to the cavity with a cement to restore the defect of the tooth defect tissue, so that the shape and function of the tooth return to normal. Compared with the filling method, the inlay can better restore the shape of the occlusal surface of the tooth and the contact relationship between the adjacent faces.
Inlays can be divided into metal inlays, hard resin inlays, and porcelain inlays depending on the material. Metal inlays have good performance, are sturdy and durable, and are widely used. However, metal inlays are often used for posterior restorations because of their aesthetic effects. The hard resin inlay and porcelain inlay color are coordinated with the human tooth color, hard and wear resistant, and the front teeth are applied more.