The Journal of Contemporary Dental Practice

Register      Login

SEARCH WITHIN CONTENT

FIND ARTICLE

Volume / Issue

Online First

Archive
Volume  25 (2024)
Volume  24 (2023)
Volume  23 (2022)
Volume  22 (2021)
Volume  21 (2020)
Volume  20 (2019)
Volume  19 (2018)
Volume  18 (2017)
Volume  17 (2016)
Volume  16 (2015)
Volume  15 (2014)
Volume  14 (2013)
Volume  13 (2012)
Volume  12 (2011)
Volume  11 (2010)
Volume  10 (2009)
Volume  9 (2008)
Volume  8 (2007)
Volume  7 (2006)
Volume  6 (2005)
Volume  5 (2004)
Volume  4 (2003)
Volume  3 (2002)
Volume  2 (2001)
Volume  1 (1999)
Related articles

VOLUME 11 , ISSUE 6 ( December, 2010 ) > List of Articles

RESEARCH ARTICLE

Effects of Two Antioxidants on the Microleakage of Resin-Based Composite Restorations after Nonvital Bleaching

Horieh Moosavi, Jamileh Ghoddusi, Mohammad Javad Moghaddas, Omid Rajabi

Citation Information : Moosavi H, Ghoddusi J, Moghaddas MJ, Rajabi O. Effects of Two Antioxidants on the Microleakage of Resin-Based Composite Restorations after Nonvital Bleaching. J Contemp Dent Pract 2010; 11 (6):33-40.

DOI: 10.5005/jcdp-11-6-33

License: CC BY-NC 3.0

Published Online: 01-05-2008

Copyright Statement:  Copyright © 2010; The Author(s).


Abstract

Aim

The aim of this study was to compare the neutralizing effect of antioxidant agents on the microleakage of dental restorations in nonvital teeth after bleaching with carbamide peroxide. Also assessed was the correlation of the microleakage data between an electrochemical and a staining technique.

Methods and Materials

Following root canal therapy, 40 sound and similar human maxillary central incisors were randomly divided into four groups of 10 specimens each (n=10). The groups were subjected to one of four treatments: Group 1, bleaching with 10 percent carbamide peroxide for periods of eight hours per day for one week without an antioxidant agent; Group 2, bleaching with 10 percent carbamide peroxide plus 10 percent sodium ascorbate gel; Group 3, bleaching with 10 percent carbamide peroxide plus 10 percent sodium ascorbate gel combined with a surfactant; and Group 4, no bleaching treatment (control group). In all groups, the access cavities were restored using the Single Bond Plus Adhesive system and Z100 resin-based composite. After 1,000 thermal cycles, the teeth were dried and three layers of nail varnish were applied over the entire surface area to within 1.0 mm of the restoration. A PVC-covered copper wire, with 3.0 mm of exposed bare wire, was inserted apically 5.0 mm into the canal, which was obturated with gutta-percha and sealed with sticky wax and varnish at the apex. Leakage was continuously monitored for 40 days using a conductimetric method. The teeth were immersed in 0.5 percent basic fuchsine for 24 hours, followed by sectioning for microscopic examination at 16x magnification. The data were analyzed using ANOVA and the Newman-Keuls multiple comparison, Kruskal-Wallis, Mann-Whitney, and Spearman's rho tests (p<0.05).

Results

Based on the electrochemical results, cavities subjected to 10 percent sodium ascorbate gel combined with a surfactant displayed the least amount of microleakage while teeth that were bleached but not treated with an antioxidant exhibited significantly greater microleakage (p=0.007). These findings also were corroborated by the results of the staining experiments that showed a strong correlation between the electrochemical and staining findings (p=0.006) for the groups.

Conclusion

After nonvital bleaching and the application of the antioxidant 10 percent sodium ascorbate, the addition of the surfactant 0.2 percent Tween 80 to the conventional antioxidant formulation significantly reduced microleakage.

Clinical Significance

The addition of a surfactant to the antioxidant formulation significantly reduced microleakage when it was applied after bleaching.

Citation

Moosavi H, Moghaddas MJ, Ghoddusi J, Rajabi O. Effect of Two Antioxidants on the Microleakage of Resin-Based Composite Restorations after Nonvital Bleaching. J Contemp Dent Pract [Internet]. 2010 December; 11(6):033- 040. Available from: http://www.thejcdp.com/ journal/view/volume11-issue6-moosavi

PDF Share
  1. Nonvital tooth bleaching: a review of the literature and clinical procedures. J Endod. 2008; 34(4):394-407.
  2. Nonvital tooth bleaching: guidelines for the clinician. Quintessence Int. 1995; 26(9):597-608.
  3. Use of different concentrations of carbamide peroxide for bleaching teeth: an in vitro study. Quintessence Int. 1998; 29(8):503-7.
  4. Intracoronal bleaching of discolored non-vital teeth. Oper Dent. 2003; 28(4):334-40.
  5. Internal bleaching with 10% carbamide peroxide in vitro. Pract Periodontics Aesthet Dent. 1998;.10(9):1145-8, 1150, 1152 passim.
  6. The effect of hydrogel and solution of sodium ascorbate on bond strength in bleached enamel. Oper Dent. 2006; 31(4):496-9.
  7. Reversal of compromised bonding to oxidized etched dentin. J Dent Res. 2001; 80(10):1919-24.
  8. Reversal of compromised bonding in bleached enamel. J Dent Res. 2002; 81(7):477-81.
  9. Ultra-morphological study of the interaction of dental adhesives with carbamide peroxide-bleached enamel. Am J Dent. 1998; 11(6):291-301.
  10. Preliminary surface analysis of etched, bleached, and normal bovine enamel. J Dent Res. 1990; 69(9):1610-3.
  11. The effect of a vital bleaching technique on enamel surface morphology and the bonding of composite resin to enamel. J Oral Rehabil. 1996; 23(4):244-50.
  12. Application of the environmental SEM in human dentin bleached with hydrogen peroxide in vitro. J Electron Microsc (Tokyo). 1992; 41(5):381-6.
  13. An atomic force microscopy study on the effect of bleaching agents on enamel surface. J Dent. 1999; 27(7):509-15.
  14. Enamel shear bond strengths after vital bleaching. Am J Dent. 1992; 5(4):216-22.
  15. Adhesion of light-cured composite resin to bleached and unbleached bovine dentin. Endod Dent Traumatol. 1990; 6(3):97-103.
  16. The effect of oxygen inhibition on an unfilled/ filled composite system. J Dent Res. 1990; 69(10):1652-8.
  17. The use of dentinal etching with endodontic bleaching procedures. J Endod. 1989; 15(11):535-8.
  18. Effect of bleaching on restorative materials and restorations—a systematic review. Dent Mater. 2004; 20(9):852-61.
  19. Bacterial leakage versus dye leakage in obturated root canals. Int Endod J. 1999; 32(5):370-5.
  20. Reliability of the dye penetration studies. J Endod. 2003; 29(9):592-4.
  21. Comparison and reliability of techniques for measuring leakage and marginal penetration. Oral Surg Oral Med Oral Pathol. 1982; 53(4):410-6.
  22. A comparison of methods used in root canal sealability studies. Oral Surg Oral Med Oral Pathol. 1982; 53(2):203-8.
  23. Lack of correlation among three methods for evaluation of apical leakage. J Endod. 2001; 27(5):347-50.
  24. Fluid transport and bacterial penetration along root canal fillings. Int Endod J. 1993; 26(4):203-8.
  25. Long-term prognosis of intentional endodontics and internal bleaching of tetracycline-stained teeth. Compend Contin Educ Dent. 1998;19(10):1034-8, 1040-2, 1044 passim.
  26. Scanning electron microscopy observations on the penetration and structure of resin tags in bleached and unbleached bovine enamel. J Endod. 1991; 17(2):72-5.
  27. Effect of nonvital tooth bleaching on microleakage of resin composite restorations. Quintessence Int. 1997; 28(5):341-4.
  28. In vitro microleakage of composite restorations after nonvital bleaching. Quintessence Int. 2001; 32(5):413-7.
  29. Reversal of compromised bonding in bleached enamel using antioxidant gel. Oper Dent. 2008; 33(4):441-7.
  30. Leakage evaluation of three different root canal obturation techniques using electrochemical evaluation and dye penetration evaluation methods. Aust Endod J. 2007; 33(1):18-22.
  31. The effect of tooth preparation on microleakage behavior. Oper Dent. 2000; 25(6):526-33.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.