Restorative inlays and onlays are types of fillings used when large or complex restorations are needed. When there is not enough healthy tooth structure left to fill, a restoration is developed to take the place of the hole in the visible tooth. For the most part, more tooth structure is spared by working with inlays and onlays than crowns. A restoration involving inlays or onlays must be milled in a dental laboratory and two visits for installation. The first visit is used to prepare an impression of the unhealthy tooth. The second visit is when the inlay or onlay is installed, once we receive it from the dental laboratory. Any of these indirect restorations are easily developed using composite, porcelain or gold materials.