Dental Inlays and Onlays

Dental inlays and onlays are custom indirect restorations used to repair selected teeth when a standard filling may not provide enough coverage but a full dental crown may not be necessary. At Bourgeois Dental Clinic in Dubai, suitability is determined by assessing the remaining tooth structure, decay, cracks, cusps, bite forces, symptoms, and existing restorations.

What Are Dental Inlays and Onlays?

An inlay fits mainly within the prepared inner portion of a tooth, usually between the cusps. An onlay extends over one or more tooth cusps to provide additional coverage and support.

They are commonly produced outside the mouth using ceramic, composite, metal, or another restorative material and then bonded or cemented to the prepared tooth.

What Is the Difference Between an Inlay and an Onlay?

An inlay repairs a damaged area that remains mainly within the central part of the tooth.

An onlay covers a larger area and includes one or more cusps when those areas are weakened, fractured, or at risk.

The final design is based on the amount of damage rather than the name alone.

When May an Inlay or Onlay Be Recommended?

An indirect restoration may be considered when:

• A cavity or old filling is too large for a predictable standard filling
• One or more tooth cusps are weakened
• A back tooth has a selected crack or fracture
• There is sufficient healthy tooth structure to avoid a full crown
• A previous filling has failed or fractured
• The tooth needs stronger coverage than direct composite alone may provide
• Wear has affected part of the chewing surface
• A conservative restoration can preserve more natural tooth structure

Who May Be Suitable for an Inlay or Onlay?

Potential candidates generally have a restorable tooth with sufficient healthy structure, stable gum health, a manageable bite, and no untreated infection.

An inlay or onlay may not be suitable when there is:

• Extensive tooth destruction
• A deep crack extending below the gumline
• Insufficient remaining tooth structure
• Severe uncontrolled grinding
• Active tooth infection
• Severe gum or periodontal disease
• A tooth requiring full circumferential coverage
• Limited restorative space

What Happens During the Consultation?

The dentist reviews pain, sensitivity, previous fillings, chewing symptoms, grinding habits, and the history of the tooth.

The assessment may include:

1. Decay assessment: Determining the size and depth of the cavity.
2. Restoration assessment: Checking old fillings for cracks, leakage, wear, and recurrent decay.
3. Crack assessment: Evaluating the location and direction of any fracture.
4. Cusp assessment: Determining whether one or more cusps require coverage.
5. Bite evaluation: Reviewing chewing forces, grinding, and tooth contacts.
6. Diagnostic records: Dental X-rays, photographs, scans, or other tests may be recommended.
7. Option comparison: Comparing an inlay, onlay, filling, crown, root canal treatment, or another option.

How Are Inlays and Onlays Placed?

Treatment commonly involves:

1. Removal of decay or failed restoration: The damaged material is carefully removed.
2. Tooth evaluation: The dentist checks the remaining structure and confirms whether an indirect restoration is suitable.
3. Preparation: The tooth is shaped to create a stable design for the restoration.
4. Digital scan or impression: A detailed record is taken.
5. Temporary restoration: A temporary filling or covering may be used while the final restoration is produced.
6. Try-in: The inlay or onlay is checked for fit, contact points, colour, and bite.
7. Bonding or cementation: The restoration is secured to the tooth.
8. Final adjustment: The dentist reviews the bite, margins, and comfort.

Do Inlays and Onlays Require Tooth Shaving?

Damaged or decayed structure and any failing restoration must be removed. Additional controlled preparation may be required to create appropriate space, margins, and restorative thickness.

Compared with a full crown, an inlay or onlay may preserve more healthy tooth structure in suitable cases.

What Materials Are Used?

Ceramic Inlays and Onlays

Ceramic restorations may be selected for tooth-coloured appearance and adhesive bonding. Material choice depends on tooth location, thickness, bite, underlying colour, and clinical requirements.

Composite Inlays and Onlays

Laboratory-made or indirect composite restorations may be used in selected cases. They have different wear and colour characteristics from ceramic.

Metal Inlays and Onlays

Metal restorations may be used in selected clinical situations where appearance is less important and mechanical requirements support their use.

Inlay or Onlay Versus a Dental Filling

A standard filling is placed directly into the tooth during the appointment. It may be appropriate for small or moderate defects with sufficient surrounding support.

An inlay or onlay is fabricated outside the mouth and may be considered when the restoration is larger or when selected tooth cusps require coverage.

Inlay or Onlay Versus a Dental Crown

A dental crown covers most or all of the visible prepared tooth. It may be required when the tooth is heavily damaged, weakened, cracked, or extensively restored.

An inlay or onlay covers only the necessary portion and may preserve more healthy structure when the remaining tooth can provide adequate support.

Can an Onlay Protect a Cracked Tooth?

An onlay may cover and support selected weakened cusps or cracks that do not extend too deeply. However, not every crack can be stabilised with an onlay.

Deep fractures, root cracks, or cracks extending below the gumline may require a crown, root canal treatment, periodontal procedure, or extraction.

Does the Tooth Need Root Canal Treatment First?

Not routinely. Root canal treatment is required only when the dental pulp is irreversibly inflamed, infected, or otherwise unable to remain healthy.

Deep decay, cracks, severe spontaneous pain, prolonged sensitivity, or infection may indicate the need for root canal assessment before the final restoration.

How Long Do Inlays and Onlays Last?

Longevity depends on the restoration material, tooth condition, preparation, bonding, bite, grinding, oral hygiene, diet, and maintenance.

The restoration may eventually chip, fracture, loosen, wear, or require replacement. The supporting tooth may also develop decay or another crack.

Can Teeth Grinding Damage an Inlay or Onlay?

Yes. Grinding can increase stress on the restoration and the remaining tooth, particularly around covered cusps and margins.

Patients with bruxism may need a custom night guard and management of the underlying grinding habit.

How to Care for an Inlay or Onlay

• Brush twice daily with fluoride toothpaste
• Clean between the restored tooth and neighbouring teeth daily
• Avoid biting hard objects
• Manage grinding and clenching
• Attend routine dental examinations
• Seek assessment if the restoration feels loose or high
• Report pain, persistent sensitivity, or discomfort when chewing
• Maintain regular professional cleaning

Dental Inlays and Onlays on Sheikh Zayed Road

Bourgeois Dental Clinic is located in Indigo Sky Building, Sheikh Zayed Road, Exit 41, near Al Thanya Street in Dubai. Our clinic is accessible from Al Barsha, Umm Al Sheif, Umm Suqeim, Jumeirah, Al Quoz, Barsha Heights, The Greens, Dubai Marina, and surrounding communities.

Book an inlay-and-onlay consultation to determine whether a filling, indirect restoration, or crown is suitable for your tooth.