Porcelain inlays are laboratory-made tooth restorations or fillings. They have superior aesthetic qualities and are strong and durable.
Once placed, they are virtually undetectable in the mouth and they preserve much of your natural tooth structure. Inlays involve only the occlusal (chewing surface) and one proximal surface (surface in between the teeth).
An onlay, which is similar to an inlay, covers the entire proximal surface and protects the cusps from fracture. The onlay is the best alternative for covering larger surface restorations. Treatment involves isolating the tooth and removal of the old fillings. Inlays and onlays are then bonded securely into place.
Usually taking two appointments to complete, inlays and onlays look exactly like the rest of the tooth, and are so durable that they should not need to be replaced for many years.