Inlays or onlays refer to indirect fillings which are made of a variety of materials including porcelain, gold, and tooth-coloured composite resin porcelain that fit into or onto the affected tooth. Its purpose is to make the tooth stronger by holding it together while retaining a natural, esthetically pleasing colour. They are used in instances when there is deficient tooth structure to support a filling but the tooth is still in a condition that does not require a crown. The advantage that porcelain inlays or onlays have over gold inlays or onlays is its aesthetic value.
