Inlays and Onlays

When a tooth has more damage than a standard filling can reliably repair, a full dental crown is not always the only option. An inlay or onlay can provide additional strength while preserving the healthy parts of your natural tooth.

At Freedom Dental, each restoration is planned around the condition, shape and function of the affected tooth. Your dentist will examine the damage and explain whether a filling, inlay, onlay or crown is the most appropriate solution.

What Are Inlays and Onlays?

Inlays and onlays are indirect dental restorations. Unlike a filling that is shaped directly inside the mouth, an inlay or onlay is custom-made to fit the prepared tooth.

An inlay fits within the raised edges, or cusps, of the tooth. It is generally used when damage is contained within the centre of the chewing surface.

An onlay covers a larger area and may extend over one or more cusps. It can provide additional protection when part of the biting surface has become weakened or damaged.

When Might You Need an Inlay or Onlay?

Your dentist may recommend an inlay or onlay when:

• A cavity is too large for a routine filling

• An existing filling needs to be replaced

• A back tooth has a crack or fracture

• Part of the chewing surface has become weakened

• There is enough healthy tooth structure to avoid a full crown

• The tooth needs additional strength and support

The correct treatment depends on the amount of healthy tooth remaining, the position of the damage and the pressure placed on the tooth during biting.

Filling, Inlay, Onlay or Crown?

These restorations repair different levels of tooth damage.

Composite Filling

A Composite Filling may be suitable for a small cavity, minor fracture or limited area of tooth damage. The material is placed and shaped directly inside the tooth.

Dental Inlay

An inlay can be used when the damage is too extensive for a standard filling but remains within the cusps of the tooth.

Dental Onlay

An onlay covers a larger part of the tooth and extends over one or more cusps. It can help strengthen a weakened chewing surface without covering the entire tooth.

Dental Crown

A crown covers most or all of the visible tooth. It may be recommended when the tooth has extensive damage or requires more complete protection.

Learn more about full-coverage restorations on our Dental Crowns and Bridges page.

How Are Inlays and Onlays Placed?

Treatment normally involves the following stages:

1. The tooth is examined, and dental X-rays may be taken.

2. Local anaesthetic is used where required.

3. Decay, damage or an old restoration is carefully removed.

4. The tooth is prepared for the new restoration.

5. A scan or impression is taken to create the custom inlay or onlay.

6. A temporary restoration may be placed while the final restoration is prepared.

7. The final inlay or onlay is checked, fitted and securely bonded to the tooth.

8. Your bite is adjusted to ensure the restoration feels comfortable.

Your dentist will explain whether your treatment requires one or more appointments.

What Are Inlays and Onlays Made From?

Inlays and onlays can be made from different dental materials. Ceramic is commonly selected because it can provide a natural appearance, accurate fit and good resistance to everyday biting pressure.

The most appropriate material will depend on the tooth being treated, the location of the damage, your bite and your individual treatment requirements.

Are Inlays Better Than Fillings?

An inlay is not automatically better than a filling. The most suitable option depends on how much tooth structure has been damaged.

A composite filling can be an effective solution for small cavities and minor damage. When a filling would be too large or may not provide enough support, an inlay or onlay can offer a more precisely fitted restoration.

Your dentist will recommend the most conservative treatment that can restore the tooth reliably.

Is an Onlay Better Than a Crown?

An onlay can be a more conservative option when the tooth needs additional protection but does not require complete coverage. Because an onlay covers only the damaged or weakened areas, more natural tooth structure can remain intact.

A crown may be more suitable when the tooth has extensive decay, a large fracture, major structural weakness or significant damage following previous treatment.

The choice should be based on the condition of the tooth rather than selecting one treatment for every situation.

Inlays and Onlays After Root Canal Treatment

A tooth that has received Root Canal Treatment may require a restoration to protect the remaining structure. Depending on the tooth and the amount of healthy tissue remaining, your dentist may recommend a filling, onlay or crown.

The final decision will consider the tooth’s position, chewing pressure and overall condition.

For more information about treatment costs and restoration options following root canal therapy, read our guide to root canal prices in Dublin.

How Long Do Inlays and Onlays Last?

Inlays and onlays can last for many years with appropriate care. Their lifespan depends on:

• The size and position of the restoration

• The condition of the remaining tooth

• Your brushing and cleaning routine

• The pressure placed on the tooth

• Teeth grinding or clenching

• Your diet and oral habits

• Regular dental examinations

No dental restoration lasts indefinitely. Regular check-ups allow your dentist to examine the restoration, surrounding tooth and bite.

How Much Do Dental Inlays and Onlays Cost?

The cost depends on the type and size of the restoration, the material selected, the tooth being treated and the complexity of the procedure.

Freedom Dental provides pricing following a clinical assessment. Your dentist will examine the tooth, explain the available options and provide personalised pricing before treatment begins.

You may also find our guide to dental crowns, bridges and their costs helpful when comparing restorative treatments.

To arrange an assessment, call 085 830 0289 or 01 872 95 69, or book an appointment online.

Caring for an Inlay or Onlay

You can help protect your restoration by:

• Brushing twice daily with fluoride toothpaste

• Cleaning carefully between your teeth

• Limiting frequent sugary snacks and drinks

• Avoiding biting ice or other very hard objects

• Discussing teeth grinding with your dentist

• Attending regular dental examinations and cleaning appointments

Professional Dental Cleaning can help control plaque and tartar around natural teeth and dental restorations.

When Should You See a Dentist?

Arrange an assessment if you notice:

• Pain when biting

• Sensitivity to hot or cold

• A broken or cracked tooth

• A damaged or loose filling

• Food repeatedly becoming trapped in a tooth

• A rough or weakened chewing surface

• Ongoing discomfort in a previously restored tooth

Treating damage early may allow your dentist to preserve more natural tooth structure and reduce the risk of the problem becoming more extensive.

Book an Inlay or Onlay Assessment in Dublin

If a damaged tooth needs more support than a filling but may not require a full crown, an inlay or onlay could provide a conservative restorative option.

Contact Freedom Dental on 085 830 0289 or 01 872 95 69, or book your appointment online.