Onlay restorations are also done in our office using the Cerec method. An onlay can be thought of as a partial crown. It is chosen when a situation indicates treatment more conservative than a crown but stronger than a filling.
Since onlays are bonded directly onto the tooth using special high-strength resins, they can usually increase strength of a tooth by up to 75 percent. As a result, they can last from 10 to 30 years.