title: X-ray microtomographic evaluation of the influence of two preparation types on marginal fit of CAD/CAM alumina copings: a pilot study.
abstract: This study evaluated the influence of two preparation types on the marginal fit of computer-aided design/computer-assisted manufacture (CAD/CAM) alumina copings. Two subgroups of four alumina copings each were fabricated using alumina master dies with either a chamfer or 90-degree shoulder preparation. Copings were scanned with an x-ray microtomographic scanner, and marginal fit was evaluated. The preparation types presented no statistically significant differences regarding marginal gap (P = .410) and absolute marginal discrepancy (P = .229). No correlation was found between marginal fit of CAD/CAM alumina copings and preparation type. Marginal fit could be considered within the limits of clinical acceptance.
authors.affiliation: Department of Prosthodontics, National and Kapodistrian University, Athens, Greece.
authors.forename: Maria-Eirini
authors.initials: ME
authors.lastname: Krasanaki
authors.forename: Stavros
authors.initials: S
authors.lastname: Pelekanos
authors.forename: Marina
authors.initials: M
authors.lastname: Andreiotelli
authors.forename: Spiridon-Oumvertos
authors.initials: SO
authors.lastname: Koutayas
authors.forename: George
authors.initials: G
authors.lastname: Eliades
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D017076:Computer-Aided Design; D003442:Crowns; D000044:Dental Abutments; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D006801:Humans; D010865:Pilot Projects; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D055114:X-Ray Microtomography
chemical_list: D003764:Dental Materials; D000537:Aluminum Oxide