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

RESEARCH ARTICLE

Influence of Simulated Pulpal Pressure on Efficacy of Bleaching Gels

Carlos Rocha Gomes Torres, Graziela Ribeiro Batista, Alessandra Bühler Borges, Paula Tamião Arantes, Annette Wiegand, Thomas Attin

Citation Information : Torres CR, Batista GR, Borges AB, Arantes PT, Wiegand A, Attin T. Influence of Simulated Pulpal Pressure on Efficacy of Bleaching Gels. J Contemp Dent Pract 2014; 15 (4):407-412.

DOI: 10.5005/jp-journals-10024-1553

Published Online: 00-08-2014

Copyright Statement:  Copyright © 2014; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim

The aim of this study was to investigate the influence of simulated pulpal pressure on efficacy of bleaching gels.

Materials and methods

Cylindrical enamel-dentin specimens from bovine teeth (3 mm diameter, enamel and dentin layer each 1 mm thick) were divided into 4 groups, according to the bleaching treatment: negative control (non-bleached), bleached with 10% carbamide peroxide (CP), bleached with 7.5% hydrogen peroxide (HP) and bleached with 35% hydrogen peroxide. Ten percent CP gel was applied for 8 h/day and 7.5% HP for 1 h/day, during 14 days. For 35% HP treatment, two sessions of 45 minutes each were employed. In intermediate periods specimens were stored in artificial saliva. Experimental groups (n = 19) were subdivided according to the simulation of pulpal pressure (25 mm Hg) during bleaching treatment. Initial color measurement and after bleaching treatment were assessed by spectrophotometry, using CIE L*a*b* system. The data were statistically analyzed by ANOVA and Dunnett's posthoc tests (p < 0.05).

Results

There was significant difference of ∆E for all experimental groups compared to negative control group, according to Dunnett's test (p < 0.0001). There were no significant difference for total color variation (∆E) among experimental groups (p > 0.05).

Conclusion

It was concluded that all bleaching gels showed bleaching efficacy compared to non-bleached group and that the simulated pulpal pressure did not influence the bleaching outcomes of the tested gels.

Clinical significance

Although numerous in vitro studies investigating the efficacy of bleaching agents have been performed, they do not properly simulate the pulpal pressure. In order to make these studies closer to clinical conditions, it is important to reproduce these conditions in laboratory, so the results can be more reliable. This in vitro study was performed under simulated pulpal pressure, aiming to investigate its influence on dental bleaching outcomes.

How to cite this article

Borges AB, Batista GR, Arantes PT, Wiegand A, Attin T, Torres CRG. Influence of Simulated Pulpal Pressure on Efficacy of Bleaching Gels. J Contemp Dent Pract 2014;15(4):407-412.


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  1. Surface detail reproduction under simulated pulpal pressure: a three-dimensional optical profilometer and scanning electron microscopy evaluation. J Prosthet Dent 2012;108(2):102-113.
  2. The effect of coffee solution on tooth color during home bleaching applications. Am J Dent 2009;22(3):175-179.
  3. Efficacy, side-effects and patients acceptance of different bleaching techniques (OTC, in-office, at-home). Oper Dent 2005;30(2):156-163.
  4. Clinical performance of vital bleaching techniques. Oper Dent 35(1):3-10.
  5. Clinical performance of vital bleaching techniques. Operative Dentistry 2010 Jan-Feb;35(1):3-10.
  6. In vivo enamel fluid movement. Eur J Oral Sci 2007;115(3):169-173.
  7. Comparative clinical study of the effectiveness of three different bleaching methods. Oper Dent 2009;34(6):635-641.
  8. Vital bleaching: the effects of heat and hydrogen peroxide on pulpal enzymes. J Endod 1986;12(3):108-112.
  9. Penetration of 38% hydrogen peroxide into the pulp chamber in bovine and human teeth submitted to office bleach technique. J Endod 2007;33(9):1074-1077.
  10. Dentinal fluid dynamics in human teeth, in vivo. J Endod 1995;21(4):191-194.
  11. Comparison of at-home and in-office tooth whitening using a novel shade guide. Oper Dent 2010;35(4):381-388.
  12. In vitro colorimetric evaluation of the efficacy of home bleaching and over-the-counter bleaching products. Quintessence Int 2010;41(6):505-516.
  13. Material characteristics of the hard tissues of bovine versus human teeth. Dtsch Zahnärztl Z 1998;53(5):713-717.
  14. Effects of distance from the pulp and thickness on the hydraulic conductance of human radicular dentin. J Dent Res 1988;67(11):1381-1385.
  15. In vitro microleakage of adhesive-sealed dentin with lactic acid and saliva exposure: a radioisotope analysis. J Dent 2004;32(3):235-240.
  16. Structure and composition of enamel. Oper Dent 1992;Suppl 5(10):10-17.
  17. A radiographic assessment of enamel thickness in human maxillary incisors. Arch Oral Biol 1998;43(10):825-831.
  18. Facilitatory effect of AC-iontophoresis of lidocaine hydrochloride on the permeability of human enamel and dentine in extracted teeth. Arch Oral Biol 2013;58(4):341-347.
  19. In vitro comparison of visual and computer-aided pre-and post-tooth shade determination using various home bleaching procedures. J Prosthet Dent 2009;101(2):92-100.
  20. Influence of dentinal fluid and stress on marginal adaptation of resin composites. J Dent Res 1993;72(2):490-494.
  21. Effects of bleaching agents on human enamel light reflectance. Oper Dent 2010;35(4):405-411.
  22. Interactions between neural and hydrodynamic mechanisms in dentine and pulp. Arch Oral Biol 1994;39 Suppl:87S-95S.
  23. Bonding of resin dentin adhesives under simulated physiological conditions. Dent Mater 1988;4(6):351-353.
  24. Changes in bovine enamel after treatment with a 30% hydrogen peroxide bleaching agent. Dent Mater J 2004;23(4):517-521.
  25. Dentin permeability: theory and practice. In: Spångberg L, editor. Experimental endodontics. Boca Raton, FL: CRC Press; 1990. p. 20-45.
  26. The effects of outward forced convective flow on inward diffusion of potassium across human dentin. Am J Dent 2002;15(4):256-261.
  27. Dentine permeability and dentine adhesion. J Dent 1997;25(5):355-372.
  28. The effects of outward forced convective flow on inward diffusion in human dentine in vitro. Arch Oral Biol 1993;38(7):577-582.
  29. Visual and spectrophotometric shade analysis of human teeth. J Dent Res 2002;81(8):578-582.
  30. Hydrostatic intrapulpal pressure and bond strength of bonding systems. Dent Mater 1991;7(11):54-58.
  31. Dentin permeability: effects of crown preparation. Int J Prosthodont 1991;4(3):219-225.
  32. Effect of simulated pulpal pressure on dentin permeability and adhesion of self-etch adhesives. Dent Mater 2007;23(6):705-713.
  33. Effect of bleaching agents on enamel permeability. Am J Dent 2006;19(5):313-316.
  34. Permeability characteristics of bovine and human dentin under different pretreatment conditions. J Endod 2001;27(1):23-30.
  35. The bleaching depth of a 35% hydrogen peroxide based in-office product: a study in vitro. J Dent 2005;33(1):33-40.
  36. Dentin perfusion effects on the shear bond strengths of bonding agents to dentin. Dent Mater 1989;5(3):181-184.
  37. Comparison of the in vivo effect of a 0 and 1,500 ppm FMFP toothpaste on fluoride uptake, acid resistance and lesion remineralization. Caries Res 1986;20(3):193-201.
  38. In vitro penetration of the pulp chamber by three brands of carbamide peroxide. J Esthet Dent 1999;11(5):259-264.
  39. Influence of chemical activation of a 35% hydrogen peroxide bleaching gel on its penetration and efficacy—in vitro study. J Dent 2010;38(10):838-846.
  40. Dental bleaching associated to LED/Laser hybrid sources. São Paulo: Editora Santos; 2007.
  41. In vitro assessment of chemical activation efficiency during in-office dental bleaching. Oper Dent 2010;35(3):287-294.
  42. Is home tooth bleaching gel cytotoxic? J Esthet Dent 1991;3(5):162-168.
  43. In vitro cytotoxicity of different desensitizers under simulated pulpal flow conditions. J Adhes Dent 2008;10(3):227-232.
  44. Efficacy of different whitening modalities on bovine enamel and dentin. Clinical Oral Invest 2005;9(2):91-97.
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