title: In vivo Study of the Accuracy of Dual-arch Impressions.
abstract: BACKGROUND
  This study evaluated in vivo the accuracy of metal (Smart®) and plastic (Triple Tray®) dual-arch trays used with vinyl polysiloxane (Flexitime®), in the putty/wash viscosity, as well as polyether (Impregum Soft®) in the regular viscosity.
  
  
  METHODS
  In one patient, an implant-level transfer was screwed on an implant in the mandibular right first molar, serving as a pattern. Ten impressions were made with each tray and impression material. The impressions were poured with Type IV gypsum. The width and height of the pattern and casts were measured in a profile projector (Nikon). The results were submitted to Student's t-test for one sample (α = 0.05).
  
  
  RESULTS
  For the width distance, the plastic dual-arch trays with vinyl polysiloxane (4.513 mm) and with polyether (4.531 mm) were statistically wider than the pattern (4.489 mm). The metal dual-arch tray with vinyl polysiloxane (4.504 mm) and with polyether (4.500 mm) did not differ statistically from the pattern. For the height distance, only the metal dual-arch tray with polyether (2.253 mm) differed statistically from the pattern (2.310 mm).
  
  
  CONCLUSIONS
  The metal dual-arch tray with vinyl polysiloxane, in the putty/wash viscosities, reproduced casts with less distortion in comparison with the same technique with the plastic dual-arch tray. The plastic or metal dual-arch trays with polyether reproduced cast with greater distortion. How to cite the article: Santayana de Lima LM, Borges GA, Burnett LH Jr, Spohr AM. In vivo study of the accuracy of dual-arch impressions. J Int Oral Health 2014;6(3):50-5.
authors.affiliation: Department of Restorative Dentistry, Pontifical Catholic University of Rio Grande do Sul, Brazil.
authors.forename: Luciana Martinelli Santayana
authors.initials: LM
authors.lastname: de Lima
authors.affiliation: Department of Dental Materials, School of Dentistry, Uberaba University, Brazil.
authors.forename: Gilberto Antonio
authors.initials: GA
authors.lastname: Borges
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Brazil.
authors.forename: Luiz Henrique Burnett
authors.initials: LH
authors.lastname: Junior
authors.affiliation: Department of Dental Materials, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Brazil.
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Spohr
keywords: Impression material; polyether; tray; vinyl polysiloxane
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