International Journal of Prosthodontics and Restorative Dentistry

Register      Login

VOLUME 1 , ISSUE 2 ( July-September, 2011 ) > List of Articles


Impression Tray Positioning Device in Research Methodology

Citation Information : Impression Tray Positioning Device in Research Methodology. Int J Prosthodont Restor Dent 2011; 1 (2):92-96.

DOI: 10.5005/jp-journals-10019-1016

Published Online: 01-09-2013

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



In spite of best available impression materials and advanced techniques, we still come across imperfect fit of a dental prosthesis. Selection of impression material is based on the results from the research carried out, hence the accuracy of this research needs to be at the topmost priority, hence a proper research model and methodology has to be followed. The purpose of this paper was to highlight on technique and the device made to meet these requirements.


An in vitro study was done to evaluate the linear dimensional accuracy of commercially available polyvinyl siloxanes of varying viscosities using different impression techniques. A standardized experimental procedure is required to provide identical direction of insertion and removal of the trays that contained the impression material. An impression tray positioning device has been designed and machined in an attempt to meet these requirements.


It was found that putty-wash 2-step techniques with controlled bulk in stock tray found to be as accurate as multiple-mix technique, utilizing heavy viscosity and low viscosity combination in a custom tray and single-mix technique, utilizing medium viscosity in a custom tray.

PDF Share
  1. Comparing the accuracy of reversible hydrocolloid and elastomeric impression material. Paper presented in 75th annual general scientific session, IADR, Singapore June 29, 1995.
  2. Johnson GH, Lepe X, Raigrodski AJ. Accuracy of newly formulated fast-setting elastomeric impression materials. J Prosthet Dent 2005;93:530-39.
  3. The effect of surface moisture on detail reproduction of elastomeric impression. J Prosthet Dent 2003;90:354-64.
  4. Time dependent accuracy of elastomeric impression materials Part II: Polyether, polysulphide, vinyl siloxane. J Prosthet Dent 1981;45: 229-33.
  5. The effect of nonionic surfactants on bubble entrapment in elastomeric impression materials. J Prosthet Dent 1979;42:342-47.
  6. Accuracy of three polyvinyl siloxane putty-wash impression techniques. J Prosthet Dent 2000;83:161-65.
  7. Effect of tray space on the accuracy of monophasic polyvinyl siloxane impressions. J Prosthet Dent 1992;68:19-28.
  8. The accuracy of stone dies made from rubber impression materials. J Prosthet Dent 1970;24(4):377-84.
  9. Dimensional accuracy of dental casts: Influence of tray materials, impression materials and time. J Prosthodont 2002;11:98-108.
  10. Accuracy of one step versus two-step putty-wash addition silicone impression techniques. J Prosthet Dent 1992;67(5):583-89.
  11. Comparison of the dimensional accuracy of one- and two-step techniques with the use of putty- wash addition silicone impression material. J Prosthet Dent 1995; 74:535-41.
  12. A comparison of impression materials for complete arch fixed partial denture. J Prosthet Dent 1991;65(1):165-69.
  13. Accuracy of six elastic impression materials for complete arch fixed partial dentures. Prosthet Dent 1976;35:407-15.
  14. Accuracy of impression material for a complete arch and fixed partial denture. J Prosthet Dent 1988;59:288-91.
  15. Distortion analysis of stone casts made from impression materials. J Prosthet Dent 1985;54(6):794-802.
  16. Dimensional stability of elastomeric impression materials in custom made and stock trays. J Prosthet Dent 1984;52(4):514-17.
  17. Determining the accuracy of stock and custom tray impression/cast. J Oral Rehabil 1998; 25:645-48.
  18. The effect of using custom or stock tray on the accuracy of gypsum casts. Int J Prosthodent 1996;9(4):367-73.
  19. Effect of impression tray design and impression techniques upon the accuracy of stone cast produced from a putty-wash polyvinyl siloxanes impression material. J Dent 1991;283-89.
  20. Accuracy and dimensional stability of elastomeric impression materials. J Prosthet Dent 1979;42(2):159-62.
  21. The effect of custom tray material type and adhesive drying times on the tensile bond strength of an impression material/adhesive system. Int J Prosthodent 1994;7:129-33.
  22. Fundamentals of fixed prosthodontics (2nd ed). Chicago: Quintessence Publication Co 1981;228.
  23. Philips science of dental materials (10th ed). WB Saunders Co. Philadelphia 1996.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.