A dental onlay is a custom filling, or sometimes referred to as a partial crown, which is made in a dental laboratory and is permanently cemented into your tooth. Onlays are used to conservatively repair teeth with large defective fillings, decay or trauma. These restorations are ideal alternatives to crowns in the right circumstance.
Onlays are essentially identical to inlays with the distinct exception that 1 or more of the cusps has been adversely affected and need to be included in the restoration.
These restorations are highly durable and will last for many years to come, providing that proper home care instructions are closely followed.