title: In vitro study on marginal and internal fit of CAD/CAM all-ceramic crowns.
abstract: The purpose of this study was to evaluate the marginal and internal fit of all-ceramic crowns fabricated using the Decsy CAD/CAM system. A master die of maxillary first premolar was measured, and experimental crowns were fabricated. Four conditions were established by combining two convergence angles (4 degrees and 12 degrees) of the abutment with two different luting space settings (15 microm and 55 microm). The results showed that the experimental crowns had a marginal gap of 42 to 56 microm. When the luting space setting was 15 microm, the internal gap was 85-88 microm; when the setting was 55 microm, the internal gap was 126-138 microm. The marginal gap for each experimental crown met the clinically acceptable criterion.
authors.affiliation: Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan. tnakamur@dent.osaka-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
authors.forename: Hideaki
authors.initials: H
authors.lastname: Tanaka
authors.forename: Soichiro
authors.initials: S
authors.lastname: Kinuta
authors.forename: Takeshi
authors.initials: T
authors.lastname: Akao
authors.forename: Kei
authors.initials: K
authors.lastname: Okamoto
authors.forename: Kazumichi
authors.initials: K
authors.lastname: Wakabayashi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Yatani
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001641:Bicuspid; D002516:Ceramics / Q000737:chemistry*; D017076:Computer-Aided Design; D003442:Crowns; D000044:Dental Abutments; D003738:Dental Cements / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007834:Lasers; D012828:Silicones / Q000737:chemistry; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic
chemical_list: D000538:Aluminum Silicates; D003738:Dental Cements; C075815:IPS-Empress ceramic; D012828:Silicones; D003776:Dental Porcelain