What are inlays and onlays?
Inlays or onlays are made of porcelain, gold, or composite resin. They are bonded to the tooth. An inlay, is similar to a filling and is placed inside the tooth; an onlay is larger and restores more of the tooth’s structure. It is similar to an inlay but extends over one or more of the cusps (points) of the tooth.
Though for many years, gold has been considered the best choice as it is conservative (does not require a lot of tooth reduction) people are choosing the more esthetic porcelain inlay or onlay as it is just as strong, looks nicer, and lasts as long as gold.