Inlays / Onlays

Dental inlays and onlays are indirect restorations used to repair teeth that have lost or damaged tooth structure. They may be considered when a tooth requires more restoration than a conventional filling can provide but does not necessarily require a full crown.

An inlay generally fits within the biting surface of the tooth, while an onlay extends further over one or more of the raised areas, or cusps, of the tooth.

Onlays preserve more of the remaining tooth than a full crown because they cover the tooth less extensively. The appropriate restoration depends on how much healthy tooth structure remains and the type of damage present.

When May an Inlay or Onlay Be Recommended?

Your dentist may consider an inlay or onlay when:

A Large Filling Needs Replacing

An existing restoration is damaged or there may not be enough suitable tooth structure for another conventional filling.

The Tooth Is Cracked or Damaged

Part of the tooth requires additional coverage and support while preserving healthy structure where possible.

A Filling May Not Be Suitable

The area requiring restoration is larger or subject to biting forces that may make another type of restoration more appropriate.

Your dentist will examine the tooth and may take X-rays before recommending the restoration that best suits its condition.

How Inlays and Onlays Restore the Tooth

The damaged or decayed portion of the tooth is prepared before the restoration is made to fit the tooth precisely. Depending on the materials and technology used, treatment may involve more than one appointment.

The completed inlay or onlay is then bonded or cemented to the prepared tooth. Tooth-coloured materials may be used where appropriate to help the restoration blend with the surrounding teeth. The Australian Dental Association recognises indirect tooth-coloured inlays and onlays as restorative dental procedures.

Frequently asked questions

What is the difference between an inlay and an onlay?

An inlay fits within the biting surface of the tooth. An onlay extends over one or more cusps and therefore covers a larger area of the tooth.

When would I need an inlay or onlay instead of a filling?

They may be considered when the area requiring repair is too extensive for a conventional filling or when additional coverage of the tooth is desirable. Your dentist will determine the most appropriate option after examining the tooth.

What is the difference between an onlay and a crown?

A crown generally covers the entire visible portion of a tooth, whereas an onlay covers only the areas that need restoration. This may allow more natural tooth structure to be preserved when clinically appropriate.

What are inlays and onlays made from?

They can be made from different restorative materials, including tooth-coloured ceramic materials. Your dentist will discuss which material is suitable for your tooth.

Will an inlay or onlay look natural?

Tooth-coloured restorations can be selected to complement the surrounding teeth, although the final appearance will depend on the tooth, material and clinical circumstances.

How many appointments are required?

The number of appointments depends on how the restoration is made and your individual treatment plan. Your dentist will explain the process before treatment begins.

How should I care for an inlay or onlay?

Brush twice daily, clean between your teeth and attend regular dental check-ups. Avoid using your teeth to bite very hard non-food objects, which can damage natural teeth as well as restorations.

How long will an inlay or onlay last?

The lifespan varies between patients and depends on factors including the condition of the tooth, material used, biting forces and oral hygiene. Your dentist can monitor the restoration during regular examinations.

Need to Restore a Damaged Tooth?

If you have a large filling, cracked tooth or damaged restoration, we can assess the tooth and discuss whether an inlay, onlay or another restorative option may be appropriate.

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