Table of Contents
ISRN Dentistry
Volume 2012 (2012), Article ID 730674, 5 pages
http://dx.doi.org/10.5402/2012/730674
Research Article

Dimensional Accuracy of Stone Casts Obtained with Multiple Pours into the Same Mold

1Department of Restorative Dentistry, Federal University of Piaui (UFPI), Terezina, PI, Brazil
2Department of Removable Prosthodontics, University of São Paulo City, São Paulo, SP, Brazil
3MSc Program in Dental Prosthesis, School of Dentistry, São Leopoldo Mandic Dental Research Center, Campinas, SP, Brazil
4MSc Program in Dental Prosthesis, São Leopoldo Mandic Dental Research Center, Campinas, SP, Brazil
5Department of Plant Science, Federal University of Piaui (UFPI), Terezina, PI, Brazil

Received 13 November 2012; Accepted 9 December 2012

Academic Editors: M. Del Fabbro, G. V. Kulkarni, A. Vissink, and D. Wray

Copyright © 2012 Valdimar da Silva Valente et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aim. The aim of the present study was to compare the dimensional accuracy of stone casts obtained with vinyl polysiloxane molds through the double-impression technique with three pours into the same mold. Methods. A stainless steel master model was constructed simulating a three-unit fixed prosthesis. Twelve impressions were taken of this master model with addition silicone, using the double-impression technique. Three pours of type IV gypsum were then made into each mold, thus producing 36 casts. The pours were made 1 hour, 6 hours and 24 hours after the impression procedure. Next, intra- and interabutment measurements were made in a coordinate measuring machine. Results. Comparative analysis of the dimensional accuracy of stone casts resulting from multiple pours was not statistically significant in pours first and second ( ). These values, however, were statistically significant at third pour in the height in abutment 1 and upper distance interabutment. Conclusion. The wait time (1 hour, and 6 hours) observed before pouring the stone into the same molds did not cause significant dimensional accuracy of the casts.