title: Micro-CT evaluation of the marginal fit of different In-Ceram alumina copings.
abstract: The aim of the study was to evaluate the marginal fit of different In-Ceram alumina ceramic cores manufactured by four different techniques. Four groups of four In-Ceram alumina core specimens (Vita), each 0.6 mm in thickness, were fabricated from a master die using four different techniques: Group SL, the slip-cast technique (In-Ceram system); Group CL, the copy-milling technique (Celay system); Group CR, a CAD/CAM system (Cerec inLab system) and Group WO, the electro-deposition dipping technique (Wol-Ceram). After the core specimens were fitted on the master die, they were scanned with the use of a microtomography device (1072 micro-CT, Sky- Scan). Datasets were processed by software (TView v1.1, SkyScan) and 10 vertical sections from each core were generated. On these microtomographic cross-sections the marginal gap (MG) and the absolute marginal discrepancy (MD) were measured in microscale (microm). The slip-cast and the electro-deposition dipping techniques presented the best results of MG with 22 microm and 35 microm, respectively (alpha<5%). The CAD/CAM system presented an MG of 55 microm. In addition, the slip-cast and the electro-deposition dipping techniques presented the best results of MD with 50 microm and 60 microm, respectively (alpha<5%). The slip-cast technique and the Wol-Ceram system presented the best marginal fit, followed by Cerec inLab, which presented clinically acceptable results. Microtomography analysis seemed to be a reliable method of evaluating the marginal fit of dental restorations.
authors.affiliation: Department of Prosthodontics, School of Dentistry, National and Kapodistrian University, Athens, Greece. pelekan@otenet.gr
authors.forename: Stavros
authors.initials: S
authors.lastname: Pelekanos
authors.forename: Maria
authors.initials: M
authors.lastname: Koumanou
authors.forename: Spiridon-Oumvertos
authors.initials: SO
authors.lastname: Koutayas
authors.forename: Spiridon
authors.initials: S
authors.lastname: Zinelis
authors.forename: George
authors.initials: G
authors.lastname: Eliades
mesh_terms: D000537:Aluminum Oxide; D003442:Crowns; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D017267:Dental Prosthesis Design / Q000379:methods*; D003765:Models, Dental; D055114:X-Ray Microtomography
chemical_list: D003776:Dental Porcelain; D000537:Aluminum Oxide