title: Where is the gap? Machinable ceramic systems and conventional laboratory restorations at a glance.
abstract: Scanning electron microscopy was used to compare the marginal gaps of restorations milled by machinable ceramic systems to the marginal gaps of conventional laboratory-sintered ceramic restorations. For occlusal surfaces, the average marginal gap was 80 microns for both laboratory- and Celay-produced inlays. The mean gap was 200 microns and 170 microns, respectively, for Cerec T (turbine motor) and Cerec EM (electric motor) inlays. For approximal boxes, the average marginal gap was 100 microns for inlays produced with conventional laboratory-sintering techniques, 80 microns for Celay restorations, and 280 microns for the Cerec T restorations, and 260 microns for Cerec EM-machined inlays. The ceramics used, as well as the different systems themselves, can influence the results and the clinical outcome of the restorations.
authors.affiliation: University of Milan, College of Dentistry, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Siervo
authors.forename: A
authors.initials: A
authors.lastname: Pampalone
authors.forename: P
authors.initials: P
authors.lastname: Siervo
authors.forename: R
authors.initials: R
authors.lastname: Siervo
mesh_terms: D002516:Ceramics; D018772:Dental Marginal Adaptation; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods*; D003776:Dental Porcelain; D005069:Evaluation Studies as Topic; D006801:Humans; D007284:Inlays; D008855:Microscopy, Electron, Scanning
chemical_list: C078572:Celay; D003776:Dental Porcelain; C074543:Cerec