Cerec Inlay/Onlay Restorations Inlays and onlays are a dental restoration that is prescribed when there is a large cavity or a large portion of tooth missing. In these situations resin or amalgam fillings may not be recommended because they would not be able to hold up over time against the force of your bite. Inlays and onlays solve the problem of needing more strength in a restoration while remaining conservative. In many cases if an inlay or onlay can not be performed a crown is recommended. Inlays and onlays can be performed in one visit with the use of Cerec technology. Cerec allows you to fabricate a custom restoration outside of the mouth. the restoration is typically made of porcelain. Once fabricated chairside the restoration is then cemented into place. With Cerec technology you can leave the office with a custom made restoration permanently cemented into place in one visit. As opposed to using a lab to fabricate your inlay or onlay. This eliminates the need to deal with impression material, the wait until you get your final restoration, or the worry that you will lose your temporary filling why you are waiting.