Inlays & Onlays
Indirect restoration (filling) consisting of a solid substance (gold or porcelain) fitted to a cavity in a tooth and cemented into place. An onlay is the same as an inlay, except that it extends to replace a cusp.
When decay or fracture incorporate areas of a tooth that make composite restorations essentially inadequate, an "onlay" might be indicated. Similar to an inlay, an onlay is an indirect restoration which incorporates a cusp or cusps by covering or onlaying the missing cusps.
