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VOLUME 15 , ISSUE 4 ( July-August, 2014 ) > List of Articles


Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials—Part II Microhardness

Mahroo Vojdani, Kianoosh Torabi, Sasan Rasaeipour, Safoura Ghodsi, Amir Ali Reza Khaledi

Citation Information : Vojdani M, Torabi K, Rasaeipour S, Ghodsi S, Khaledi AA. Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials—Part II Microhardness. J Contemp Dent Pract 2014; 15 (4):438-443.

DOI: 10.5005/jp-journals-10024-1559

Published Online: 01-01-2015

Copyright Statement:  Copyright © 2014; The Author(s).



The exponential usage of esthetic restorative materials is beholden to society needs and desires. Interaction between the bleaching agents and the esthetic restorative materials is of critical importance.


This in vitro study has been conducted to evaluate the effect of a home bleaching agent, carbamide peroxide (CP) 38%, on the microhardness of the fiber reinforced composite (FRC), overglazed, autoglazed, or polished porcelain specimens.

Materials and methods

For overglazed, autoglazed, polished ceramics and also FRC cylindrical specimens (n = 20 per group) were prepared. The specimens were stored in distilled water at 37°C for 48 hours prior to testing. Six samples from each group were selected randomly as negative controls which were stored in distilled water at 37°C that was changed daily. CP 38% was applied on the test specimens for 15 minutes, twice a day for 14 days. By using Knoop-microhardness tester microhardness testing for baseline, control and test specimens was conducted. Data were statistically analyzed using paired t-test, Mann- Whitney test, and Kruskal-Wallis test.


Home bleaching significantly decreased the surface microhardness of all the test samples (p < 0.05), whereas the control groups did not show statistically significant changes after 2 weeks. The polished porcelain and polished composite specimens showed the most significant change in microhardness after bleaching process (p < 0.05).


Although the type of surface preparation affects the susceptibility of the porcelain surface to the bleaching agent, no special preparation can preclude such adverse effects.

Clinical Significance

The contact of home bleaching agents with esthetic restorative materials is unavoidable. Therefore protecting these restorations from bleaching agents and reglazing or at least polishing the restorations after bleaching is recommended.

How to cite this article

Torabi K, Rasaeipour S, Ghodsi S, Khaledi AAR, Vojdani M. Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials — Part II Microhardness. J Contemp Dent Pract 2014;15(4):438-443.

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  1. The role of bleaching in esthetics. Dent Clin North Am 1989 Apr;33(2):319-336.
  2. Survey of patient attitudes toward current esthetic procedures. J Prosthet Dent 1984 Dec;52(6):775-780.
  3. Dental bleaching. Curr Opin Dent 991 Apr; 1(2):185-191.
  4. Home-use tooth bleaching agents: an in vitro study on quantitative effects on enamel, dentin, and cementum. Quintessence Int 1994 Aug;25(8):541-546.
  5. The efficacy and safety of a 10% carbamide peroxide bleaching gel. Quintessence Int 1998 Sep;29(9):555-563.
  6. Effectiveness of various whitening techniques and their effects on the enamel surface [in German]. Schweiz Monatsschr Zahnmed 2002;112(9):894-900.
  7. Clinical evaluation of in-office and at-home bleaching treatments. Oper Dent 2003 Mar-Apr;28(2):114-121.
  8. In vivo kinetics of bleaching gel with three-percent hydrogen peroxide within the first hour. Oper Dent 2003 May-Jun;28(3):236-241.
  9. Efficacy, side-effects and patients’ acceptance of different bleaching techniques (OTC, in-office, at home). Oper Dent 2005 Mar-Apr;30(2):156-163.
  10. Effects of bleaching on teeth and restorations. Compend Contin Educ Dent 1998 Aug;19(8):815-820.
  11. Color of restorative materials after staining and bleaching. Oper Dent 1999 Sep-Oct;24(5):292-296.
  12. The effect of different bleaching agents on the surface texture of restorative materials. Oper Dent 2006 Jul-Aug;31(4):473-480.
  13. Effect of salivary biofilm on the adherence of oral bacteria to bleached and nonbleached restorative material. Dent Mater 1999 Jan;15(1):14-20.
  14. Effects of home bleaching products on composite resins. Quintessence Int 1992 Jul;23(7):489-494.
  15. Peroxide bleaches: effect on tensile strength of composite resins. J Prosthet Dent 1993 Mar;69(3):247-249.
  16. Restorative considerations with vital tooth bleaching. J Am Dent Assoc 1997 Apr;128 Suppl:60S-64S.
  17. The effect of bleaching agents on the microhardness of dental esthetic restorative materials. J Oral Rehabil 2002 Jul;29(7):657-661.
  18. Effect of carbamide peroxide on composite resins. Quintessence Int 1991;22(10):817-821.
  19. The safety-in-use of 10% carbamide peroxide (Opalescence) for bleaching teeth under the supervision of a dentist. Br Dent J 1999 Aug 28;187(4):190-194.
  20. Effects of three concentrations of carbamide peroxide on the structure of enamel. J Oral Rehabil 2000 Apr;27(4):332-340.
  21. Dental effects of home bleaching gels and whitening strips on the surface hardness of resin composites. Am J Dent 2005 Oct;18(5):323-326.
  22. Effect of in-office tooth bleaching on the microhardness of six dental esthetic restorative materials. Dent Mater 2007 Feb;23(2):153-158.
  23. The effect of 2 different bleaching regimens on the surface roughness and hardness of tooth-colored restorative materials. Quintessence 2007 Feb;38(2):e83-87.
  24. Effects of colgate platinum professional toothwhitening system on microhardness of enamel, dentin, and composite resins. Compend Suppl 1994; (17):S627-S630.
  25. Effects of in-office tooth whiteners on hardness of tooth-colored restoratives. Oper Dent 2002 Mar-Apr;27(2):137-141.
  26. Effect of bleaching gels on the surface roughness, hardness and micromorphology of composites. Gen Dent 2002 May-Jun;50(3):247-250.
  27. Effects of bleaching with carbamide peroxide gels on microhardness of restoration materials. J Esthet Restor Dent 2003;15(3):175-182.
  28. The effect of at-home bleaching on the microhardness of six esthetic restorative materials. J Am Dent Assoc 2007 Jul;138(7):978-984.
  29. Effect of artificial saliva storage on microhardness and fracture toughness of a hydrothermal glass-ceramic. J Prosthodont 2009 Jun;18(4):324-331.
  30. Tooth bleaching using peroxide-containing agents: current status of safety issues. Compend Contin Educ Dent 1998 Aug;19(8):783-786.
  31. Effect of different peroxide bleaching regimens and subsequent fluoridation on the hardness of human enamel and dentin. J Prosthet Dent 2004 Oct;92(4):337-342.
  32. Carbamide peroxide bleaching agents: effects on surface roughness of enamel, composite and porcelain. Clin Oral Investig 2006 Mar;10(1):23-28.
  33. The effects of temperature and bleaching gels on the properties of tooth-colored restorative materials. J Prosthet Dent 2011 Feb;105(2):100-107.
  34. Surface morphology changes in human enamel, dentin and cementum following bleaching: a scanning electron microscopy study. Endod Dent Traumatol 1996 Apr;12(2):82-88.
  35. Composite resin color change after vital tooth bleaching. J Prosthet Dent 1992 Jun;67(6):778-781.
  36. Effects of home bleaching preparations on composite resin color. J Prosthet Dent 1992 Oct;68(4):575-578.
  37. Effects of bleaching on teeth and restorations. Compend Contin Educ Dent 1998 Aug;19(8):815-820.
  38. The pH of tooth-whitening products. J Can Dent Assoc 2000 Sep;66(8):421-426.
  39. Effect of bleaching on subsurface microhardness of composite and a polyacid modified composite. Dent Mater 2007 Feb;23(2):198-203.
  40. Effect of curing lights and bleaching agents on physical properties of a hybrid composite resin. J Esthet Restor Dent 2008;20(4):266-273.
  41. The effect of bleaching agents on the surface hardness of tooth colored restorative materials. J Contemp Dent Pract 2005 May 15;6(2):18-26.
  42. Higherconcentration carbamide peroxide effects on surface roughness of composites. J Esthet Restor Dent 2002;14(2):92-96.
  43. Wear and microhardness of different resin composite materials. Oper Dent 2003 Sep-Oct;28(5):628-634.
  44. Subsurface damage layer of in vivo worn dental composite restorations. J Dent Res 1984 May;63(5):675-680.
  45. Composite degradation in vivo. Dent Mater 1986 Oct;2(5):225-227.
  46. Effects of 35% carbamide peroxide gel on surface roughness and hardness of composite resins. J Dent TUMS 2010;7(1):6-12.
  47. Evaluation of the Effect of a Home bleaching Agent on the Surface Characteristics of Indirect Esthetic Restorative Materials: Part I—Roughness. J Contemp Dent Pract 2014;15(3):324-328.
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