INLAY & ONLAY

What is an Inlay and Onlay?

Inlays and onlays are types of indirect dental restorations made outside the mouth (usually in a dental lab) and then cemented onto the tooth. They are often made from porcelain, composite resin, or gold.

Inlay

Fits within the cusps (the raised points) of a tooth, similar to a large filling. It restores damage that does not extend to the tooth’s outer edges.

Onlay

Covers one or more cusps and may extend over the biting surface. It’s used when the damage is more extensive, but the tooth doesn’t need a full crown.

When Are Inlays and Onlays Required?

Inlays or onlays are recommended when:

Benefits of Inlays and Onlays

How Are Inlays and Onlays Different from Crowns?

Feature Inlays & Onlays Crowns
Coverage Partial – Inlay fits inside; Onlay covers part of the tooth Full – Covers the entire tooth surface
Tooth Preparation Conservative – Less tooth reduction More aggressive – More tooth is trimmed
Use Case Moderate decay or fracture Severe decay, cracks, or after root canal
Material Porcelain, resin, gold Porcelain, metal, zirconia, or a combo
Longevity 10–30 years (depending on material) 10–15+ years (depending on type)
In summary, inlays and onlays are excellent middle-ground solutions between simple fillings and full crowns — offering strength, aesthetics, and tooth preservation.