Inlays and onlays are laboratory made restorations in porcelain or gold. An inlay is the text book option when a cavity runs over several surfaces because the fit, strength, and lifespan are much better than white fillings. Onlays function like crowns but require less tooth removal.
At the first appointment, any decay is removed and an impression is taken. At the following visit, my laboratory technician will have made a customized inlay or onlay to bond onto the tooth that has very high strength and long lifespan.