Inlays and onlays are restorative treatments for posterior teeth, fabricated in a dental laboratory using porcelain or resin materials. They are classified as inlays, onlays or overlays depending on the size of the restoration and the portion of the tooth being restored.
In the past, these restorations were commonly made of gold. However, due to the high cost of gold and the advancement of modern dental materials, its use today is limited.
When Are Inlays & Onlays Recommended?
Inlays are recommended when the loss of tooth structure is extensive and a large filling could lead to future complications. During polymerization, composite resin fillings may undergo shrinkage, potentially creating microscopic gaps between the tooth and the filling. These gaps may allow bacteria to penetrate, increasing the risk of recurrent tooth decay.
Inlays & Onlays vs Dental Crowns
An alternative to a large filling is the placement of a dental crown. However, crown placement requires the preparation of the entire tooth, involving the removal of healthy tooth structure to create adequate space for the crown.
One of the main advantages of inlays and onlays is that, if such a restoration fails, the tooth can still be restored with a dental crown. The opposite, however, is not possible once a crown has already been placed.
Materials Used
- Resin Inlays & Onlays: A more cost-effective solution.
- Porcelain Inlays & Onlays: A more aesthetic option, offering superior appearance, though at a higher cost.
