Restorations are then adhesively cemented. After being air-dried, the intaglio surfaces are silanated and heat dried at 68 oC for 5 minutes (Calset; AdDent Inc). The tooth preparations are airborne-particle abraded and etched for 30 seconds with 37.5% phosphoric acid, rinsed, and dried. Adhesive resin (Optibond FL, bottle 2; Kerr Corp) is applied to both fitting surfaces of the restoration. After the luting material (Filtek Z100; 3M ESPE), preheated to 68oC (in Calset; AdDent), is applied to the tooth, the restorations were individually seated, followed by the elimination of excess composite resin and initial light polymerization. Each surface is exposed at 1000 mW/cm2 for 1 minute (20 seconds per surface, repeated 3 times). Margins are then covered with an air barrier and light polymerized for an additional 20 seconds. Margins are finished and polished at the following appointment with diamond ceramic polishers and silicon impregnated rubber polishers.