Fillings that are custom made by a dental technician, that offer beauty and exceptional durability. Usually made from porcelain, but in some cases – of gold. The difference between inlays and onlays is the size of the filling. Small filling, covered by the tooth cusps, are called inlays. Large filling that also includes the chewing cusps are called outlays. Reasons for inlay or outlay restorations include broken or fracture teeth, decayed teeth, fractured old filling or large filling and cosmetic enhancement.