1.Amalgam (silver fillings) is produced by mixing mercury with silver, tin, copper and zinc. Although mercury is a toxic material when bonded to other metals it becomes stable and therefore can be used in dental applications. The addition of silver provides strength, tin for workability, copper for corrosion resistance and zinc to prevent oxidation. One of the benefits of using silver fillings as a dental material is its durability. These fillings can last 10-15 years, which is usually much longer than other types of dental fillings. The strength of this padding is strong enough to resist wear and tear from chewing forces. This is especially noticeable when the fill has good bulk strength. However it could easily be chipped on the edges. Therefore it can be stated that this padding has good biocompatibility. The disadvantages of silver fillings concern aesthetics. The silver color of the fillings does not match the appearance of the teeth making them unattractive to the eye. Additionally, fillings can cause discoloration of surrounding teeth, making them appear a light shade of gray. When you drink cold or hot liquids, your teeth may expand or contract. The filling will expand and contract, making the filling more likely to break. Finally, some people may have allergic reactions to the mercury in amalgam. Tooth-colored composites are a mixture of submicron glass and acrylic filters that form a tooth-colored restoration. The main advantage of composites can be seen when it comes to aesthetics. The color of the fillings can be matched to the color of the tooth. This is why they are used in the front teeth. A unique feature of this filling is its ability to chemically bond to the tooth structure......at the center of the paper......der is its resistance to compression. This is important because most of the chewing forces act on compression. With this test it is possible to see which dental material is able to resist the most occlusal forces. Another property to consider is called bending strength. This is defined as the ability of a material to bend before breaking. It is important to have high bending strength when making dental materials because the materials must be able to be repeatedly bent under the action of chewing. To conclude an ideal dental material it will be necessary to consider both aesthetic and functional properties. Functional properties include high elasticity, strength, high tensile strength, high compressive strength and high flexural strength. In addition to these properties, it is important that the material is non-toxic and biocompatible with the oral cavity.