Inlays & Onlays in the Virgin Islands Inlays and onlays can be made of porcelain, gold, or composite resin. These pieces are bonded to the damaged area of the tooth. An inlay, which is similar to a filling, is used inside the cusp tips of the tooth. An onlay is a more substantial reconstruction, similar to the inlay but extending out over one or more of the cusps of the tooth. For more info, please visit at https://www.videntalcenter.com/cosmetic-treatments/inlays-onlays