Onlays are used to replace your silver fillings or as a conservative alternative to crowns. They are usually made from ceramic or composite resins and are undetectable once placed. Much of your tooth structure remains intact, so it is very easy to establish function.
Onlays could also be used to restore large amalgams that have reached over a cusp (bump) of your tooth. Multiple visits are needed as this is a technique sensitive procedure that requires a lab to fabricate from an impression we supply. Onlays are durable enough to last many years.