Fixed prosthesis can be a crown or bridge.
When making crown, the tissue of the tooth has to be removed due to meeting the static requirement of the tooth when preparing it for uniform strain.
During making bridge, supplementing one or more teeth are needed, so the teeth beside the missing ones support the supplements.
To prevent root canal treated teeth from breaking down, crown is often applied. The crown is made by the dental mechanic according to the mold taken from the tooth.
As for their materials, the crown and bridge can be made from metal-ceramics (nickel free metal alloy, cobalt-chrome) gold-ceramics and metal free.
Metal free prostheses don’t contain metal, so they are applicable in case of any dental allergy and they meet the highest standards of aesthetics.
As for their application, they can be pure porcelain crowns and porcelain-like on Zirconium-oxide frame.
The zirconium-oxide crown provides perfect fitting due to its computer, so called CAD/CAM, design; its strong fram is resistant to breaks and cracks.