Dental restorations maybe internal or inlay, or external or onlay and these, in turn, may the partial or total.
The crown is a total peripheral restoration. It is indicated for functional or esthetic requirements, and may be metallic, acrylic, metal with porcelain, only porcelain, or of compound materials.
The preparation of the tooth to receive a crown varies according to the type of material that is used for its construction. The great challenge is to achieve peripheral sealing that prevents microbial colonisation (an objective that is very difficult to achieve), which would cause further caries. Because of this, the useful life of crowns is usually limited.
The veneers are also a prosthetic option when the esthetics of the anterior region need to be improved or when this region has lost its function. The veneers are planed to a thickness of 1mm to 2mm, respecting the point of contact between the teeth.
Partial prostheses used in the posterior segment may be inlay, in other words, contained within the tooth remnant, or onlay, when they partially cover the tooth remnant. They may be made of porcelain, composites or cast in metal.