At present time we have many systems to make indirect metal free restorations, the most current in use is the CAD / CAM, whose design and processing are assisted by a computer. For the preparation of a restoration by this method, three phases must be followed: digitization of the dental preparation obtained by means of a scanner, design of the restoration achieved through a computer program and machining of a ceramic block from which the restoration comes. The place where the production of the restorations is made determines the procedure and protocol of its manufacture. This technique combines the resistance of new ceramic materials with the aesthetics it offers; currently there is a wide variety of materials that can be manufactured.

Dental ceramics are considered products of inorganic nature, formed mainly by non-metallic elements that are obtained by the action of heat. In general, they are characterized by being biocompatible, resistant to corrosion, do not react with liquids or acids and have good resistance to bending and fracture. Its main characteristic, which allows it to be used as a restorative material, is its refractory nature and its optical properties such as translucency.