Effect of polyvinylsiloxane material and impression handling on the accuracy of digital models.

Autor: Camardella LT; Postgraduate student, Department of Orthodontics, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil. Electronic address: leocamardella@globo.com., Alencar DS; Postgraduate student, Department of Orthodontics, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil., Breuning H; Assistant professor, Department of Orthodontics and Craniofacial Biology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands., de Vasconcellos Vilella O; Professor, Department of Orthodontics, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil.
Jazyk: angličtina
Zdroj: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics [Am J Orthod Dentofacial Orthop] 2016 May; Vol. 149 (5), pp. 634-44.
DOI: 10.1016/j.ajodo.2015.10.027
Abstrakt: Introduction: The objective of this study was to evaluate the accuracy and reliability of measurements on digital models obtained by scanning impressions 5, 10, and 15 days after they were made from 2 soft putty polyvinylsiloxane (PVS) materials.
Methods: Thirty volunteers were selected for making impressions of their dentitions with alginate to create a plaster model and with PVS impression material to create a digital model by laser scanning. Three examiners made the plaster model measurements with digital calipers and repeated these measurements on the digital models made from the scanned PVS impressions. A total of 34 distances were evaluated. Paired t tests were used to evaluate intraexaminer error and the accuracy of the digital model measurements. Measurement reproducibility and reliability among examiners were tested.
Results: Although statistically significant differences between measurements on plaster and digital models were found, these discrepancies were not clinically significant except for overbite. Both plaster and digital models had high intraclass correlation coefficient values.
Conclusions: Digital models acquired by laser scanning of 2 types of soft putty PVS material may be used with clinically acceptable accuracy, reliability, and reproducibility, even at a postscanning interval of 15 days.
(Copyright © 2016 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: