title: Microcomputed tomography marginal fit evaluation of computer-aided design/computer-aided manufacturing crowns with different methods of virtual model acquisition.
abstract: This in vitro study used microcomputed tomography to evaluate the marginal fit of crowns fabricated using a chairside computer-aided design/computer-aided manufacturing (CAD/CAM) system with different methods of virtual model acquisition. Crowns were fabricated to fit in a cast containing a single human premolar. Four methods of virtual model acquisition were used: Group 1 (control), digital impressioning of a typodont; Group 2, digital impressioning of a powdered typodont; Group 3, digital impressioning of a regular impression; and Group 4, digital impressioning of a master cast. Statistically significant differences were found between the marginal gap of Group 2 and the other groups (P < 0.05); no differences were found among Groups 1, 3, and 4. The results showed that crowns fabricated using the chairside CAD/CAM system exhibited significantly smaller vertical misfit when a thin layer of powder was applied over the typodont before digital impressioning.
authors.forename: Flavio Domingues
authors.initials: FD
authors.lastname: das Neves
authors.forename: Celio Jesus
authors.initials: CJ
authors.lastname: do Prado
authors.forename: Marcel Santana
authors.initials: MS
authors.lastname: Prudente
authors.forename: Thiago Almeida Prado Naves
authors.initials: TA
authors.lastname: Carneiro
authors.forename: Karla
authors.initials: K
authors.lastname: Zancope
authors.forename: Leticia Resende
authors.initials: LR
authors.lastname: Davi
authors.forename: Gustavo
authors.initials: G
authors.lastname: Mendonca
authors.forename: Lyndon
authors.initials: L
authors.lastname: Cooper
authors.forename: Carlos Jose
authors.initials: CJ
authors.lastname: Soares
mesh_terms: D001641:Bicuspid / Q000000981:diagnostic imaging* / Q000601:surgery; D017076:Computer-Aided Design; D003442:Crowns; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design / Q000379:methods*; D006801:Humans; D055114:X-Ray Microtomography / Q000379:methods