Filling is a dental procedure in which a dental material is used to fill a cavity in a tooth. Dental restorations can be divided into two main kinds , one is direct restoration and the other is an indirect restoration.

·         Direct restoration

In direct restoration material is made from an alloy consisting of mercury and other metals like silver, copper, or tin. This is called an amalgam filling. The other type of direct filling is a white filling in which a composite resin or glass ionomer material is used.

·         Indirect Restoration

Indirect restoration materials made from compounds of metal and nonmetals, which is chiseled and contoured before the placement in tooth. They often  very closely resemble natural teeth in strength and hardness and can be aesthetic ie porcelain.