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VOLUME 8 , ISSUE 3 ( September-December, 2014 ) > List of Articles

RESEARCH ARTICLE

Influence of Delayed Pours of Addition Silicone Impressions on The Dimensional Accuracy of Casts

A Kumar, G Mahesh, R Mehta, S Pande, S Wadhwa, A Dahiya, N Duggal

Citation Information : Kumar A, Mahesh G, Mehta R, Pande S, Wadhwa S, Dahiya A, Duggal N. Influence of Delayed Pours of Addition Silicone Impressions on The Dimensional Accuracy of Casts. J Oral Health Comm Dent 2014; 8 (3):148-153.

DOI: 10.5005/johcd-8-3-148

License: NA

Published Online: 01-09-2014

Copyright Statement:  NA


Abstract

Aims and objectives

To evaluate and compare the time dependent dimensional accuracy of polyvinyl siloxane impressions.

Materials and methods

A brass master die containing two identical posts simulating two complete crown tapered abutment preparation was served as a standardized master model. Impressions were made with polyvinyl siloxane materials (monophase and regular body) using a brass made custom tray. The impressions were poured at intervals of 75 min, 24 hours, 48 hours and 1 week, Interabutment and intraabutment distance were measured in the recovered stone dies using a profile projector with an accuracy of 0.001mm.

Results

Results of this study indicated that the casts made were dimensionally accurate and the polyvinyl siloxane silicones are dimensionally stable impressions for one week period.

Conclusion

Delayed pouring of the impressions at four different time periods did not significantly affect the accuracy of the casts produced.


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  1. Linear dimensional accuracy of a polyvinyl siloxane of varying viscosities using different impression techniques. Journal of Investigative and Clinical Dentistry 2010;1:37–46.
  2. Assessment of preference of mixing techniques and duration of mixing and tray loading for two viscosities of vinyl polysiloxane materials. J Prosthet Dent 2007;97:12–17.
  3. Dimensional accuracy of resultant casts made by a monophase, one-step and two-step and a novel two-step putty/light-body impression technique: an invitro study. J Prosthet Dent 2008;99:274–81.
  4. Properties of addition type silicone impression materials. JADA 1980;101:482–84.
  5. Accuracy of elastomeric impression materials on repeated pours. The Journal of Indian Prosthodontic Society 2006;6:68–71.
  6. Ability of various impression materials to produce duplicate dies from successive impressions. J Prosthet Dent 1995; 73:333–40.
  7. Comparative evaluation of dimensional accuracy of casts made by repeated pouring of addition silicone impressions using 1) Two-step putty/light body technique using stock tray and 2) one-step simultaneous dual viscosity technique using custom tray: An in-vitro study. J Nepal Dent Assoc 2010;11:32–39.
  8. The accuracy of stone dies made from rubber impression materials. J Prosthet Dent 1970;24:377–86.
  9. Clinically oriented evaluation of the accuracy of commonly used impression materials. J Prosthet Dent 1986;56:4–8.
  10. 19 for Non-Aqueous, Elastomeric Dental Impression Materials. JADA 1977;94:733–41.
  11. An evaluation of the time dependent dimensional stability of eleven elastomeric impression materials. J Prosthet Dent 1984;52:120–25.
  12. Time dependent accuracy of elastomer impression materials. Part II: Polyether, Polysulfids and polyvinyl siloxanes. J Prosthet Dent 1981;45:329–33.
  13. Accuracy and dimensional stability of elastomeric impression materials. J Prosthet Dent 1979;42:159–62.
  14. Linear dimensional changes in addition curing silicone impression materials. J Prosthet Dent 1982;47:411–13.
  15. Clinically oriented evaluation of the accuracy of commonly used impression materials. J Prosthet Dent 1986;56:4–8.
  16. Accuracy of four types of rubber impression materials compared with time of pour and a repeat pour of models. J Prosthet Dent 1985;53:484–90.
  17. Dimensional Accuracy of dental casts: Influence of tray material, impression material and time. J Prosthodont 2002;11:98–108.
  18. Evaluation and comparison of dimensional accuracy of different elastomeric impression materials under dry and wet conditions at various time intervals. Trends in Prosthodontics and Dental Implant logy 2010;1:31–33.
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