Inlays and onlays are conservative, long-lasting dental restorations used to repair teeth that are too damaged for a standard filling but not damaged enough to require a full crown. Both restorations are custom-made in a professional dental laboratory using composite resin, gold, or tooth-colored porcelain, and they are permanently bonded to the tooth for strength, durability, and a natural look.
What Are Inlays and Onlays?
Inlays
An inlay fits within the grooves of a tooth and does not cover the chewing cusps.
Ideal for repairing:
- Large defective fillings
- Decay or damage limited to the inner portion of the tooth
- Teeth needing reinforcement without full crown coverage
Onlays
An onlay is similar to an inlay but extends over one or more chewing cusps.
Because of this, onlays are sometimes called partial crowns.
Ideal for restoring:
- Broken or fractured cusps
- Larger areas of decay
- Teeth needing support without removing as much structure as a crown requires
Why Choose an Inlay or Onlay?
Inlays and onlays are often preferred because they are more conservative than crowns, preserving more natural tooth structure while providing exceptional strength.
Reasons Your Dentist May Recommend These Restorations
- Broken or fractured teeth
- Cosmetic improvement
- Moderate to extensive decay
- Replacement of fractured or failing fillings
- Large fillings that no longer provide adequate support
Both inlays and onlays are durable and long-lasting, though they may eventually need replacement due to normal wear.
What Is the Procedure Like?
Inlays and onlays follow nearly identical treatment steps and generally require two appointments.
Visit 1: Preparation & Impressions
- Teeth are numbed for comfort.
- Decay and/or old filling material is removed.
- The tooth is shaped to ensure a precise fit for the restoration.
- Highly accurate impressions (molds) are taken for the dental laboratory.
- A temporary restoration is placed to protect the tooth during fabrication.
Visit 2: Final Placement
- The temporary restoration is removed.
- The inlay or onlay is tried in and checked for accuracy, comfort, and bite alignment.
- The restoration is permanently cemented into place.
- Final adjustments ensure a smooth, natural fit.
How Do I Care for an Inlay or Onlay?
To maximize the lifespan of your restoration, follow these guidelines:
- Brush twice daily with proper technique
- Floss daily to protect the restoration’s margins
- Maintain regular dental cleanings and exams
- Eat a balanced diet and avoid excessively hard foods
- Follow all care instructions provided by your dentist
Good oral hygiene and routine dental visits help keep your restoration strong and healthy for many years.