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VOLUME 14 , ISSUE 3 ( May-June, 2013 ) > List of Articles

RESEARCH ARTICLE

Surface Roughness of Polyvinyl Siloxane Impression Materials Following Chemical Disinfection, Autoclave and Microwave Sterilization

Abdulaziz Abdullah Al Kheraif

Citation Information : Kheraif AA. Surface Roughness of Polyvinyl Siloxane Impression Materials Following Chemical Disinfection, Autoclave and Microwave Sterilization. J Contemp Dent Pract 2013; 14 (3):483-487.

DOI: 10.5005/jp-journals-10024-1349

Published Online: 01-06-2013

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


Abstract

Background

Autoclave sterilization and microwave sterilization has been suggested as the effective methods for the disinfection of elastomeric impressions, but subjecting elastomeric impressions to extreme temperature may have adverse effects on critical properties of the elastomers.

Aim

To evaluate the effect of chemical disinfection as well as autoclave and microwave sterilization on the surface roughness of elastomeric impression materials.

Materials and methods

The surface roughness of five commercially available polyvinyl siloxane impression materials (Coltene President, Affinis Perfect impression, Aquasil, 3M ESPE Express and GC Exafast) were evaluated after subjecting them to chemical disinfection, autoclaving and microwave sterilization using a Talysurf Intra 50 instrument. Twenty specimens from each material were fabricated and divided into four equal groups, three experimental and one control (n = 25). The differences in the mean surface roughness between the treatment groups were recorded and statistically analyzed.

Results

No statistically significant increase in the surface roughness was observed when the specimens were subjected to chemical disinfection and autoclave sterilization, increase in roughness and discoloration was observed in all the materials when specimens were subjected to microwave sterilization.

Conclusion

Chemical disinfection did not have a significant effect but, since it is less effective, autoclave sterilization can be considered effective and autoclaving did not show any specimen discoloration as in microwave sterilization. Microwave sterilization may be considered when impressions are used to make diagnostic casts. A significant increase in surface roughness may produce rougher casts, resulting in rougher tissue surfaces for denture and cast restorations.

Clinical significance

Autoclave sterilization of vinyl polysiloxane elastomeric impressions for 5 minutes at 134°C at 20 psi may be considered an effective method over chemical disinfection and microwave sterilization, because chemical disinfection does not eliminate all disease-causing microorganisms and microwave sterilization leads to a rougher impression surface.

How to cite this article

Al Kheraif AA. Surface Roughness of Polyvinyl Siloxane Impression Materials Following Chemical Disinfection, Autoclave and Microwave Sterilization. J Contemp Dent Pract 2013;14(3):483-487.


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  1. The effect of disinfectants on the properties of dental gypsum: mechanical properties. J Prosthodont 2002 Sep;11(3):161-167.
  2. Linear dimensional change in dental impressions after immersion in disinfectant solutions. J Prosthet Dent 1988 Dec;60(6):725-728.
  3. Disinfection of irreversible hydrocolloid impression with sodium hypochlorite steam: assessment of surface roughness and dimensions of gypsum models. Rev Odonto Sci 2010 Jul;25(3):276-281.
  4. Evaluation of hardness and surface roughness of two maxillofacial silicones following disinfection. Braz Oral Res 2009 Jan-Mar;23(1):49-53.
  5. Surface detail, compressive strength, and dimensional accuracy of gypsum casts after repeated immersion in hypochlorite solution. J Prosthet Dent 2006 Jun;95(6):462-468.
  6. Disinfection procedures: their effect on the dimensional accuracy and surface quality of irreversible hydrocolloid impression materials and gypsum casts. Dent Mater 2002 Mar;18(2):103-110.
  7. Effect of disinfecting irreversible hydrocolloid impressions on the resultant gypsum casts: Part II--Dimensional changes. J Prosthet Dent 1993 Dec;70(6):532-537.
  8. Microwave sterilization. J Am Dent Assoc 1985 Feb;110(2):194-198.
  9. Dimensional stability of polyvinyl siloxane impression material following ethylene oxide and steam autoclave sterilization. J Prosthet Dent 1991 Apr;65(4):519-525.
  10. The effect of sterilization on addition silicone impressions in custom and stock metal trays. J Prosthet Dent 1994 Jun;71(6):625-630.
  11. Reproducibility of sterilized rubber impressions. Braz Dent J 2004;15(3):209-213.
  12. Effect of pigmentation and chemical disinfection on the elastic recovery and tear strength of a silicone maxillofacial prosthetic material. Rev Odontol Unesp 2004 Oct-Dec;33(4):189-194.
  13. Surface quality and long-term dimensional stability of current elastomeric impression materials after disinfection. J Prosthodont 2007 Sep-Dec;16(5):343-351.
  14. Surface characteristics of polyether and addition silicone impression materials after long-term disinfection. J Prosthet Dent 1995 Aug;74(2):181-186.
  15. Elastomeric impression materials. Dimensional stability and surface detail sharpness following treatment with disinfection solutions. Swed Dent J 1980;4(4):161-167.
  16. Dimensional stability and detail reproduction of irreversible hydrocolloid and elastomeric impressions disinfected by immersion. J Prosthet Dent 1988 Apr;79(4):446-453.
  17. Accuracy of elastomeric impressions disinfected by immersion. J Am Dent Assoc 1988 Apr;116(4):525-530.
  18. The effect of different investment techniques on the surface roughness and irregularities of gold palladium alloy castings. J Prosthet Dent 2008 Apr;99(4):282-286.
  19. Some effects of disinfecting solutions on the properties of alginate impression material and dental stone. Eur J Prosthodont Restor Dent 2001 Sep-Dec;9(3-4):131-135.
  20. Phillips’ science of dental materials. 11th ed. India: Saunders; An imprint of Elsevier; 2009. 219 p.
  21. Physical properties and compatibility with dental stones of current alginate impression material. J Oral Rehab 2004 Nov;31(11):1115-1122.
  22. Friction and roughness measurement of elastomers. Available from: http://www.nanovea.com/Application%20Notes/elastomercofficientoffriction.pdf.
  23. Study of surface roughness and marginal fit using newly developed microfinishing bur and new preparation technique. Int J Microdent 2009;1:61-64.
  24. Surface roughness of impression materials and dental stones scanned by noncontacting laser profilometry. Dent Mater 2009 Apr;25(4):500-505.
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