International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 3 , ISSUE 1 ( January-March, 2013 ) > List of Articles

RESEARCH ARTICLE

A Comparative Evaluation of Six Commonly used Types of Die Materials for the Property of Abrasion Resistance, at Two Time Intervals: An in vitro Study

Sattyam V Wankhade, Kaushal V Sanghavi, Vilas Rajguru, Jyoti Lokade

Citation Information : Wankhade SV, Sanghavi KV, Rajguru V, Lokade J. A Comparative Evaluation of Six Commonly used Types of Die Materials for the Property of Abrasion Resistance, at Two Time Intervals: An in vitro Study. Int J Prosthodont Restor Dent 2013; 3 (1):1-6.

DOI: 10.5005/jp-journals-10019-1067

Published Online: 01-03-2013

Copyright Statement:  Copyright © 2013; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Background and objectives

This in vitro study evaluated and compared the abrasion resistance of types IV and V gypsums, resin-modified type IV and type V gypsums, synthetic gypsum, and epoxy resin die material at two different time intervals spanning a period of 24 hours.

Materials and methods

A total of 10 dies of each die material were fabricated and tested for abrasion resistance at each time interval. An average of five readings was taken for the test, measuring the rate of abrasion of the materials.

Results

All the tested properties of the epoxy resin material were far superior to those of the other materials (being tested). Resin-modified type IV gypsum had significantly better abrasion resistance than its type V counterpart at setting. However, when tested at 24 hours, both materials had comparable resistance to abrasion, which was the highest among the gypsum-based materials.

Interpretation and conclusion

Epoxy die resin had the most superior physical properties of all. A significant decrease in the rate of abrasion (-38 to -83%) was noted, when the gypsumbased products were tested at 24 hours. From the data obtained in this study, it is recommended that when gypsum-based materials are used, to wait at least 24 hours prior to separating casts from impressions (and subsequent laboratory procedures) to avoid damage to the casts and dies.

Abbreviations

RR IV: Resin modified type IV gypsum; RR V: Resin modified type V gypsum; S: Synthetic gypsum; V: Type V gypsum; IV: Type IV gypsum.

How to cite this article

Wankhade SV, Sanghavi KV, Rajguru V, Lokade J. A Comparative Evaluation of Six Commonly used Types of Die Materials for the Property of Abrasion Resistance, at Two Time Intervals: An in vitro Study. Int J Prosthodont Restor Dent 2013;3(1):1-6.


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  1. Impregnation of stone dies with acrylic resin. J Prosthet Dent 1970 Jan;23(1):96-98.
  2. Properties and characteristics of a resin die material. J Prosthet Dent 1975 Sep;34(3):297-304.
  3. Scraping resistance of dental die materials: a comparison of brands. Oper Dent 1978 Spring;3(2):66-72.
  4. Evaluation of resin die materials. J Prosthet Dent 1979 Sep;42(3):304-307.
  5. Effectiveness of hardening films on die stone. J Prosthet Dent 1980 Jul;44(1):57-63.
  6. Accuracy, detail reproduction, and hardness of gypsum casts produced from silicone impressions treated with glow discharge. J Prosthet Dent 1990 Nov;70(5):457-464.
  7. Compressive strength and surface hardness of type IV die stone when mixed with water substitutes. J Prosthet Dent 1984 Oct;52(4):510-514.
  8. The dimensional accuracy of improved dental stone, silverplated, and epoxy resin die materials. J Prosthet Dent 1988 Mar;59(3):307-310.
  9. Dimensional, form and hardness changes of dies for indirect dental technique. J Am Dent Assoc 1956 Feb;52(2):162-185.
  10. Some experiments on the surface hardness of dental stones. J Prosthet Dent 1956;6(1):94-100.
  11. Effects of cyanoacrylates on die stone. J Prosthet Dent 1983 May;49(5):639-646.
  12. Measurement of coating agents used for surface protection of stone dies. J Prosthet Dent 1986 Apr;55(4):470-474.
  13. Measurement and reinforcement of the superficial hardness of indirect stone models. J Dent Res 1962 Jul-Aug;41: 752-759.
  14. Tribology: friction and wear of engineering materials. London: Edward Arnold; 1992.
  15. Surface hardness, compressive strength and abrasion resistance of indirect die stones. J Prosthet Dent 1952;2(3):381-387.
  16. Cutting resistance tests of die materials. J Prosthet Dent 1959;9(3):467-477.
  17. Properties of die materials: a comparative study. J Prosthet Dent 1966;16(1):119-131.
  18. Study of the physical properties of type IV gypsum, resin containing, and epoxy die materials. J Prosthet Dent 2000 Apr;83(4):466-473.
  19. Philips’ science of dental materials. 11th ed. St Louis: Saunders; 2003. p. 316-319.
  20. Influence of surface hardener on gypsum abrasion resistance and water sorption. J Prosthet Dent 2003 Nov;90(5):441-446.
  21. Surface mechanical properties of stone, resin and metal dies. J Am Dent Assoc 1981 Sep;103(3):408-411.
  22. Alterations of surface hardness with gypsum die hardeners. J Prosthet Dent 2004 Jul;92(1):35-38.
  23. Abrasion resistance of a resin-impregnated type IV gypsum in comparison to conventional products. J Prosthet Dent 2002 Mar;87(3):319-322.
  24. Abrasion resistance of coated gypsum dies. Oper Dent 1983 Winter;8(1):2-5.
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