Odontology

, Volume 103, Issue 3, pp 274–279 | Cite as

Effect of various tooth whitening modalities on microhardness, surface roughness and surface morphology of the enamel

  • So Ran Kwon
  • Steven R. Kurti
  • Udochukwu Oyoyo
  • Yiming Li
Original Article

Abstract

The purpose of this study was to evaluate the effect of four whitening modalities on surface enamel as assessed with microhardness tester, profilometer, and scanning electron microscopy (SEM). Whitening was performed according to manufacturer’s directions for over-the-counter (OTC), dentist dispensed for home use (HW) and in-office (OW) whitening. Do-it-yourself (DIY) whitening consisted of a strawberry and baking soda mix. Additionally, negative and positive controls were used. A total of 120 enamel specimens were used for microhardness testing at baseline and post-whitening. Following microhardness testing specimens were prepared for SEM observations. A total of 120 enamel specimens were used for surface roughness testing at baseline and post-whitening (n = 20 per group). Rank-based Analysis of Covariance was performed to compare microhardness and surface roughness changes. Tests of hypotheses were two-sided with α = 0.05. There was a significant difference in Knoop hardness changes (ΔKHN) among the groups (Kruskal–Wallis test, p < 0.0001). Significant hardness reduction was observed in the positive control and DIY group (p < 0.0001). Mean surface roughness changes (ΔRa) were significantly different among the groups (Kruskal–Wallis test, p < 0.0001). Surface roughness increased in the OTC group (p = 0.03) and in the positive control (p < 0.0001). The four whitening modalities—DIY, OTC, HW and OW induced minimal surface morphology changes when observed with SEM. It can be concluded that none of the four whitening modalities adversely affected enamel surface morphology. However, caution should be advised when using a DIY regimen as it may affect enamel microhardness and an OTC product as it has the potential to increase surface roughness.

Keywords

Tooth whitening Enamel Microhardness Surface roughness Scanning electron microscope 

References

  1. 1.
    Kwon SR, Meharry M, Oyoyo U, Li Y. Efficacy of various tooth whitening modalities as measured with different shade assessment tools: an in vitro study. J Dent Res. 2013;92 (Spec Iss A) #29.Google Scholar
  2. 2.
    Da Costa JB, McPharlin R, Paravina RD, Ferracane JL. Comparison of at-home and in-office tooth whitening using a novel shade guide. Oper Dent. 2010;35:381–8.CrossRefPubMedGoogle Scholar
  3. 3.
    Auschill TM, Hellwig E, Schmidale S, Sculean A, Arweiler NB. Efficacy, side-effects and patients’ acceptance of different bleaching techniques (OTC, in-office, at-home). Oper Dent. 2005;30:156–63.PubMedGoogle Scholar
  4. 4.
    Bizhang M, Chun Y-HP, Damerau K, Singh P, Raab WH-M, Zimmer S. Comparative clinical study of the effectiveness of three different bleaching methods. Oper Dent. 2009;34:635–41.CrossRefPubMedGoogle Scholar
  5. 5.
    Kwon SR, Wang J, Oyoyo U, Li Y. Evaluation of bleaching efficacy and erosion potential of four different over-the-counter bleaching products. Am J Dent. 2013;26:356–60.PubMedGoogle Scholar
  6. 6.
    American Dental Association Council on Scientific Affairs. Tooth whitening/bleaching: treatment considerations for dentists and their patients. Chicago: ADA; 2009.Google Scholar
  7. 7.
    Cubbon T, Ore D. Hard tissue and home tooth whiteners. CDS Rev. 1991;84:32–5.PubMedGoogle Scholar
  8. 8.
    Hammel S. Do-it-yourself tooth whitening is risky. US News and World: Report; 1998. p. 66.Google Scholar
  9. 9.
    Li Y. Safety controversies in tooth whitening. Dent Clin N Am. 2011;55:229–39.CrossRefGoogle Scholar
  10. 10.
    Ben-Amar A, Liberman R, Gorfil C, Bernstein Y. Effect of mouthguard whitening on enamel surface. Am J Dent. 1995;24:817–24.Google Scholar
  11. 11.
    Yeh ST, Su Y, Lu YC, Lee SY. Surface changes and acid dissolution of enamel after carbamide peroxide bleach treatment. Oper Dent. 2005;30:507–15.PubMedGoogle Scholar
  12. 12.
    Potočnik I, Kosec L, Gašperšič D. Effect of 10% carbamide peroxide whitening gel on enamel microhardness, microstructure, and mineral content. J Endod. 2000;26:203–6.CrossRefPubMedGoogle Scholar
  13. 13.
    Basting RT, Rodrigues AL, Serra MC. The effect of 10% carbamide peroxide, carbopol and/or glycerin on enamel and dentin microhardness. Oper Dent. 2005;30:608–16.PubMedGoogle Scholar
  14. 14.
    Scherer W, Penugonda B, Styner D, Georgescu M. At-home vital bleaching: effects on stained enamel and dentin. Pract Periodontics Aesthet Dent. 1992;4:11–5.PubMedGoogle Scholar
  15. 15.
    Götz H, Duschner H, White DJ, Klukowska MA. Effects of elevated hydrogen peroxide ‘strip’ whitening on surface and subsurface enamel including subsurface histomorphology, micro-chemical composition and fluorescence changes. J Dent. 2007;35:457–66.CrossRefPubMedGoogle Scholar
  16. 16.
    Joiner A. Review of the effects of peroxide on enamel and dentine properties. J Dent. 2007;35:889–96.CrossRefPubMedGoogle Scholar
  17. 17.
    Sun L, Liang S, Wang YSZ, Jiang T, Wang Y. Surface alteration of human tooth enamel subjected to acidic and neutral 30% hydrogen peroxide. J Dent. 2011;39:686–92.CrossRefPubMedGoogle Scholar
  18. 18.
    Attin T, Schmidlin PR, Wegehaupt F, Wiegand A. Influence of study design on the impact of whitening agents on dental enamel microhardness: a review. Dent Mater. 2009;25:143–57.CrossRefPubMedGoogle Scholar
  19. 19.
    International Organization for Standardization. ISO 28399 Dentistry––products for external tooth bleaching. Geneva: International Organization for Standardization; 2011.Google Scholar
  20. 20.
    American Dental Association. ANSI/ADA Specification No. 41 for recommended standard practices for biological evaluation of dental materials. Chicago: ADA, 2005.Google Scholar
  21. 21.
    Home teeth whitening: baking soda and strawberries for a whiter smile (Accessed April 18, 2013) Available at: www.fitwatch.com/health/home-teeth-whitening-strawberries-baking-soda-137.html.
  22. 22.
    Peters MC. Strategies for noninvasive demineralized tissue repair. Dent Clin N Am. 2010;54:507–25.CrossRefPubMedGoogle Scholar
  23. 23.
    Mielczarek A, Klukowska A, Ganowicz M, Kwiatkowska A, Kwasny M. The effect of strip, tray and office bleaching systems on enamel surfaces in vitro. Dent Mater. 2008;24:1495–500.CrossRefPubMedGoogle Scholar
  24. 24.
    Pinto CF, de Oliveira R, Cavalli V, Giannini M. Peroxide bleaching agent effects on enamel surface microhardness, roughness and morphology. Braz Oral Res. 2004;18:306–11.CrossRefPubMedGoogle Scholar
  25. 25.
    Moraes RR, Marimon JLM, Schneider LFJ, Correr Sobrinho L, Camacho GB, Bueno M. Carbamide peroxide bleaching agents: effects on surface roughness of enamel, composite and porcelain. Clin Oral Investig. 2006;10:23–8.CrossRefPubMedGoogle Scholar
  26. 26.
    Azrak B, Callaway A, Kurth P, Willerhausen B. Influence of bleaching agents on surface roughness on surface roughness of sound or eroded dental enamel specimens. J Esthet Restor Dent. 2010;22:391–401.CrossRefPubMedGoogle Scholar
  27. 27.
    Faraoni-Romano JJ, Turssi CP, Serra MC. Concentration-dependent effect of bleaching agents on microhardness and roughness of enamel and dentin. Am J Dent. 2007;20:31–4.PubMedGoogle Scholar
  28. 28.
    Mondelli RFL, De Azevedo JFDG, Francisconi PAS, Ishikiriama SK, Mondelli J. Wear and surface roughness of bovine enamel submitted to bleaching. Eur J Esthet Dent. 2009;4:396–403.PubMedGoogle Scholar
  29. 29.
    Aykut-Yetkiner A, Wiegand A, Bollhader A, Becker K, Attin T. Effect of acidic solution viscosity on enamel erosion. J Dent Res. 2013;92:289–94.CrossRefPubMedGoogle Scholar
  30. 30.
    West NX, Hughes JA, Addy M. The effect of pH on erosion of dentin and enamel by dietary acids in vitro. J Oral Rehabil. 2001;28:860–4.CrossRefPubMedGoogle Scholar

Copyright information

© The Society of The Nippon Dental University 2014

Authors and Affiliations

  • So Ran Kwon
    • 1
  • Steven R. Kurti
    • 2
  • Udochukwu Oyoyo
    • 2
  • Yiming Li
    • 2
  1. 1.University of Iowa College of Dentistry and Dental ClinicsIowa CityUSA
  2. 2.Loma Linda UniversityLoma LindaUSA

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