Learn about a custom restoration for part of a tooth’s chewing surface.
How an onlay differs from a filling
Onlays are custom restorations fitted and bonded to the tooth. An inlay fits within the chewing surface, while an onlay extends over at least one cusp. A crown covers more of the tooth. These options are not interchangeable in every situation.
The dentist needs to assess decay, cracks, existing restorations and the forces on the tooth. The aim is to choose a restoration with appropriate coverage rather than choosing the smallest or largest option automatically.
Questions worth bringing to the appointment
Ask the dentist to show you the area that needs repair and explain why an onlay is being considered. If another option has already been suggested, request a comparison of the expected tooth preparation, materials, appointments and costs.
Mention any history of grinding, clenching or a restoration repeatedly coming loose. Confirm how the restoration will be made, whether anything temporary is needed, and when its contact with the opposing teeth will be checked.
A restoration with ongoing care
An onlay does not remove the need for cleaning and regular examinations. The surrounding tooth remains part of the care plan. Ask how to recognize a problem with the restoration and whom to contact if your bite feels different after placement.
Your questions, answered.
Can every damaged tooth have an onlay instead of a crown?
No. The amount of remaining tooth and the type of damage help determine whether an onlay can provide appropriate support.
Is an onlay removable?
An onlay is bonded to the tooth as a fixed restoration. It is not an appliance you remove for cleaning.
Can I choose the material?
Discuss your priorities with the dentist and ask which materials are suitable for the tooth. Material selection should take function as well as appearance into account.
Learn more
This guide offers general patient information. Your dentist will assess your needs and explain the available options, risks and alternatives.
