Onlays are similar to inlays. Unlike inlays, which are only placed inside your tooth, an onlay is placed on the tooth. After decay is removed from your tooth, an impression is made. The onlay is crafted from the impression and cemented to your tooth during a second visit. The onlay is stronger than a traditional filling.
Onlays can be crafted from gold, ceramic or resin. Gold onlays are the strongest, but are also very expensive and don’t match your natural tooth. Ceramic is strong and matches the tooth, but is also expensive. Resin is the least expensive option, but is not as strong as gold and ceramic. Your dentist can help you decide which material to use.