International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 1 , ISSUE 3 ( October-December, 2011 ) > List of Articles

RESEARCH ARTICLE

In vitro Comparison of Dimensional Stability of Stone Dies Obtained from Two Elastomers after Two Treatments

Venkatesan Narayanan, Jayantha Padmanabhan

Citation Information : Narayanan V, Padmanabhan J. In vitro Comparison of Dimensional Stability of Stone Dies Obtained from Two Elastomers after Two Treatments. Int J Prosthodont Restor Dent 2011; 1 (3):169-173.

DOI: 10.5005/jp-journals-10019-1031

Published Online: 01-03-2014

Copyright Statement:  Copyright © 2011; The Author(s).


Abstract

Aim

The aim of the study was to compare the dimensional stability of dies obtained from addition silicone and polyether impressions that were reheated or subjected to vacuum treatment.

Materials and methods

A master die was constructed of a rectangular stainless steel block on to which a photosensitive nylon printing plate attached which contains engraved test grooves. A custom-tray was fabricated and impressions were made using addition silicone and polyether before and after the two treatments. A total of 90 impressions and dies were made from both the elastomers and divided as control group, group I (reheated impressions) and group II (vacuum-treated impressions). A comparative analysis was done to determine which dies yielded the best dimensional accuracy compared to that of the master die.

Results

The minimum percentage dimensional change was observed in test dies made from addition silicone impressions of group I (reheated impressions), followed by the test dies made from polyether impressions in control group. The maximum percentage dimensional change was observed in test dies made from polyether impressions in group I (reheated impressions), followed by the test dies made from addition silicone impressions in group II (vacuum-treated impressions).

Conclusion

The dies obtained from reheated addition silicone impressions yielded the best dimensional stability overall when compared with that of the master die. The dies made of polyether impressions after reheating were not clinically acceptable, because of its hydrophilic nature swelled when they were reheated in a water bath.


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  1. The effect of immersion disinfection of elastomeric impressions on the surface detail reproduction of improved gypsum casts. J Prosthet Dent 1990; 63;233-41.
  2. Effects of vacuum and pressure on accuracy, reproducibility, and surface finish of stone casts made from polyvinyl siloxane. J Prosthet Dent 1986;55;466-71.
  3. An in vitro study of a surface wetting agent for addition reaction silicone impressions. J Prosthet Dent 1994;71;390-93.
  4. Effect of plasma treatment on the wettability of elastomeric impression materials. J Prosthet Dent 1993;70:165-71.
  5. 19 for Non-Aqueous, Elastomeric Dental Impression Materials. J Am Dent Assoc 1977;94:733.
  6. Sherrard: Dimensional accuracy of improved dental stone and epoxy resin die materials. Part I. J Prosthet Dent 1997;77:131.
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