Fatigue Resistance Of Ultrathin Cad/cam Complete Crowns With A Simplified Cementation Process

dc.creatorMagne
dc.creatorPascal; Carvalho
dc.creatorAdriana O.; Bruzi
dc.creatorGreciana; Giannini
dc.creatorMarcelo
dc.date2015-OCT
dc.date2016-06-07T13:19:41Z
dc.date2016-06-07T13:19:41Z
dc.date.accessioned2018-03-29T01:39:51Z
dc.date.available2018-03-29T01:39:51Z
dc.identifier
dc.identifierFatigue Resistance Of Ultrathin Cad/cam Complete Crowns With A Simplified Cementation Process. Mosby-elsevier, v. 114, p. 574-579 OCT-2015.
dc.identifier0022-3913
dc.identifierWOS:000362311900020
dc.identifier
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0022391315002504
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/242744
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1306442
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionStatement of problem. Traditional tooth preparation for complete crowns requires a substantial amount of hard tissue reduction. This is in contrast with the principles of minimally invasive dentistry. An ultrathin complete crown preparation is proposed instead. Purpose. The purpose of this in vitro study was to assess the fatigue resistance and failure mode of computer-aided design and computer-aided manufacturing (CAD/CAM) ultrathin complete molar crowns placed with self-adhesive cement. Different restorative materials (resin nanoceramic [RNC], feldspathic ceramic [FEL], and lithium disilicate [LD]) were compared. Material and methods. Forty-five extracted molars with a standardized crown preparation were restored with the Cerec 3 CAD/CAM system using FEL, LD, or RNC (n=15). FEL and LD restorations were etched with hydrofluoric acid and silanated. RNC restorations and all preparations were treated with airborne-particle abrasion. All restorations (thickness=0.7 mm) were cemented with RelyX Unicem II Automix cement and submitted to cyclic isometric loading, beginning with a load of 200 N (5000 cycles) and followed by stages of 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30 000 cycles each. The specimens were loaded until failure or for a maximum of 185 000 cycles. The failure mode was categorized as "catastrophic," "possibly reparable," or "reparable." The groups were compared using life table survival analysis (log rank test at alpha=.05). Previously published data from the same authors about traditional complete crowns (thickness 1.5 mm) using the same experimental design were included for comparison. Results. All specimens survived the fatigue test until the 600 N step. RNC, LD, and FEL failed at an average load of 1014 N (1 survival), 1123 N (2 survivals), and 987 N (no survivals), and no difference in survival rate was found. No catastrophic failures were reported after the fatigue test. Comparison with previously published data showed that 1.5-mm thick complete crowns demonstrated higher survival rates than the ultrathin restorations, independent of the material. Conclusions. The fatigue resistance of ultrathin complete molar crowns (placed with a simplified cementation process) made of RNC, LD, and FEL was not significantly different. All materials survived the normal range of masticatory forces. All failures were re-restorable. Regular crowns of 1.5 to 2.0 mm thickness may present higher survival rates than ultrathin ones.
dc.description114
dc.description4
dc.description
dc.description574
dc.description579
dc.description3M ESPE
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCNPq [20092/2011-6]
dc.descriptionCAPES [3110/2010, 4979/11-7]
dc.description
dc.description
dc.description
dc.languageen
dc.publisherMOSBY-ELSEVIER
dc.publisher
dc.publisherNEW YORK
dc.relationJOURNAL OF PROSTHETIC DENTISTRY
dc.rightsembargo
dc.sourceWOS
dc.subjectSevere Dental Erosion
dc.subjectPreparation Designs
dc.subjectOcclusal Veneers
dc.subjectComposite Resin
dc.subjectIn-vitro
dc.subjectRestorations
dc.subjectTeeth
dc.titleFatigue Resistance Of Ultrathin Cad/cam Complete Crowns With A Simplified Cementation Process
dc.typeArtículos de revistas


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