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VOLUME 16 , ISSUE 5 ( May, 2015 ) > List of Articles


The Impact of Expasyl® Gingival Retraction Paste on the Bond Strength of Self-etch and Total-etch Systems

Zeeshan H Ahmad, Sukumaran Anil, Alaa El Araby, Mohammad D Al Amri

Citation Information : Ahmad ZH, Anil S, Araby AE, Amri MD. The Impact of Expasyl® Gingival Retraction Paste on the Bond Strength of Self-etch and Total-etch Systems. J Contemp Dent Pract 2015; 16 (5):335-339.

DOI: 10.5005/jp-journals-10024-1686

Published Online: 01-10-2015

Copyright Statement:  Copyright © 2015; The Author(s).



To evaluate the influence of Expasyl® gingival retraction paste on the shear bond strength of self-etch and total-etch adhesive systems.

Materials and methods

Twenty-four specimens of extracted, caries-free, sound human molars were used in this study. The molars were then cut vertically into halves through the buccal and lingual cusps. Forty-eight specimens were divided into four groups (total-etch, total-etch with Expasyl application, self-etch, self-etch with Expasyl application) and the shear bond strength was tested.


Expasyl significantly reduced the shear bond strength of the self-etch and total-etch adhesive systems. The self-etch system showed relatively lower performance compared with the total-etch adhesive system. The shear bond strength values of the total-etch adhesive without Expasyl showed the highest bond strength (21.48 ± 2.89), while the self-etching group adhesive treated with Expasyl showed the lowest shear bond strength value (14.89 ± 1.81).


From the observations of this in vitro study, it can be concluded that the use of Expasyl® gingival retraction system can negatively affect bond strength of adhesives. The total-etch system showed better compatibility to the Expasyl gingival retraction system than the self-etch.

How to cite this article

Al Baker AMA, El Araby A, Al Amri MD, Sukumaran A. The Impact of Expasyl® Gingival Retraction Paste on the Bond Strength of Self-etch and Total-etch Systems. J Contemp Dent Pract 2015;16(5):335-339.

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  1. Influence of blood contamination on bond strength of a self-etching system. Eur J Dent 2010;4(3):280-286.
  2. Bond strengths of two adhesive systems to dentin contaminated with a hemostatic agent. Oper Dent 2007;32(4):399-405.
  3. Influence of conditioning time on enamel adhesion. Quintessence Int 2006;37(1):35-41.
  4. Aggressiveness of contemporary selfetching adhesives—part II: etching effects on unground enamel. Dent Mater 2001;17(5):430-444.
  5. Nanoleakage patterns of four dentin bonding systems. Dent Mater 2000;16(1):48-56.
  6. Moist versus dry dentin: its effect on shear bond strength. Am J Dent 1992;5(3):127-129.
  7. Bond strength of composite to dentin using conventional, one-step, and self-etching adhesive systems. J Dent 2001;29(1):55-61.
  8. Bonding to intact dentin. J Dent Res 1996;75(9):1706-1715.
  9. Aggressiveness of contemporary selfetching systems—I: depth of penetration beyond dentin smear layers. Dent Mater 2001;17(4):296-308.
  10. A clinical study on the effects of cordless and conventional retraction techniques on the gingival and periodontal health. J Clin Periodontol 2008;35(12):1053-1058.
  11. Comparative study of gingival retraction methods. J Prosthet Dent 1983;50(4):561-565.
  12. Effect of retraction procedures on the periodontium in humans. J Prosthet Dent 1980;44(5):508-515.
  13. The effect of gingival retraction procedures on periodontal indices and crevicular fluid cytokine levels: a pilot study. J Prosthodont 2006;15(2):108-112.
  14. Expasyl: protocol for use with fixed prosthodontics. Clinic (Paris) 2002;23:97-103.
  15. The influence of retraction agents on cytoskeleton reorganization and oxidative stress in primary human gingival fibroblasts (HGFs). Arch Oral Biol 2014;59(3):341-348.
  16. Bond strength of multi-step and simplified-step systems. Am J Dent 1996;9(6):269-272.
  17. One step bond strength to enamel and dentin. Am J Dent 1997;10(1):5-8.
  18. Shear bond strengths of one-bottle dentin adhesives using multiple applications. Oper Dent 1997;22(5):194-199.
  19. Bond strength of composite to astringent-contaminated dentin using selfetching adhesives. Am J Dent 2005;18(3):168-172.
  20. The influence of the dentin smear layer on adhesion: a self-etching primer vs a total-etch system. Dent Mater 2003;19(8):758-767.
  21. Disturbance of the dentinal smear layer by acidic hemostatic agents. J Prosthet Dent 1994;72(1):4-7.
  22. Bonding to dentin with a self-etching primer: the effect of smear layers. Dent Mater 2001;17(2):122-126.
  23. Influence of different luting concepts on long term retentive strength of zirconia crowns. Am J Dent 2009;22(2):122-128.
  24. A predictable gingival retraction system. Compend Contin Educ Dent 2002;23(1 Suppl):7-12.
  25. Haemostatic agents used in periradicular surgery: an experimental study of their efficacy and tissue reactions. Int Endod J 2006;39(10):800-808.
  26. An innovative tissue-retraction material. Compend Contin Educ Dent 2002;23(1 Suppl):13-17.
  27. The clinical performance of adhesives. J Dent 1998;26(1):1-20.
  28. Effect of salivary contamination on the bond strength of total-etch and self-etch adhesive systems: an in vitro study. J Contemp Dent Pract 2012;13(5):655-660.
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