In vitro evaluation of dental bleaching effectiveness using hybrid lights activation

Avaliação in vitro da eficácia da fotoativação no clareamento dental utilizando a técnica em consultório

ORIGINAL ARTICLE

In vitro evaluation of dental bleaching effectiveness using hybrid lights activation

Avaliação in vitro da eficácia da fotoativação no clareamento dental utilizando a técnica em consultório

Rodrigo Maximo Araújo; Carlos Rocha Gomes Torres; Maria Amélia Maximo de Araújo

Postgraduate Program of Restorative Dentistry, Faculty of Dentistry of São José dos Campos, UNESP, São José dos Campos, SP, Brazil

^{Correspondence}

ABSTRACT

PURPOSE: The aim of this in vitro study was to evaluate whether using different types of light activation during the in-office bleaching agent technique increases the effectiveness of the dental bleaching procedure by measuring the color change in teeth.

METHODS: From 60 extracted bovine incisor teeth, specimen sizes were standardized and dentin was conditioned by immersion in 38% phosphoric acid for 15 s. Following this procedure, the samples were placed in a water bath with ultrasound for 20 min and then immersed in a 25% coffee solution for a two-week period. The dentin was polished with a felt disc and aluminum oxide paste and finally sealed with colorless nail polish. Specimens were randomly divided into five groups, and their original color was measured using the EasyShade (VITA) spectrophotometer. All specimens received three applications of the bleaching agent Opalescence Xtra-Boost (Ultradent) during a period of 15 min each. Group 1 did not receive light activation, Group 2 was activated with a Halogen light (15 min), Group 3 was activated with a blue hybrid LEDs and a laser (15 min), Group 4 was activated with light from a green LED and a laser (15 min) and Group 5 was activated with a red laser (15 min). Tooth color was measured again after performing the various bleaching techniques on all specimens. The resulting data on color variations "E, "a*, "b* and "L*, and the color variations referenced on the Vita Classical scale were subjected to ANOVA, Tukey and Dunn tests (α=5%).

RESULTS: The bleaching performance of 38% hydrogen peroxide was affected by the light source used; color reduction was observed for the blue LED and halogen lights, and quantitative assessments of tooth color measured by spectrophotometer and matched to the Vita Classical color scale arrived at similar results in all experimental groups.

CONCLUSIONS: The type of hybrid lights used interferes in the efficiency of the bleaching agent.

Key words: Bleaching; light; LED

RESUMO

OBJETIVO: Avaliar se fontes de luz aumentam a eficácia do peróxido de hidrogênio na técnica de clareamento profissional.

METODOLOGIA: Foram empregados 60 dentes incisivos bovinos, com dimensões coronárias e radiculares padronizadas a partir do limite amelo-cementário, sendo descartada a porção lingual. Os corpos-de-prova (cp) foram limpos em ultra-som por 20 min e a dentina condicionada com H₃PO₄ a 38% por 15 s, sendo os (cp) imersos em solução de café solúvel a 25% por duas semanas. A dentina foi impermeabilizada com esmalte e os (cp) divididos em 5 grupos, sendo a cor inicial mensurada através do espectofotômetro-EasyShade (VITA). Todos os (cp) receberam três aplicações por 10 min do gel clareador Opalescence Xtra-Boost (Ultradent) conforme segue: Grupo 1 - controle, não recebeu fotoativação, Grupo 2 - ativado com luz halôgena, Grupo 3 - ativado com LED azul/LASER, Grupo 4 - ativado com LED verde/LASER e Grupo 5 - ativado com LED vermelho. Após o clareamento foi mensurada a variação de cor "E, "a*, "b*e "L* e as referentes à escala de cor Vita Clássico. Os dados foram submetidos à análise de variância, teste de Tukey e de Dunn (α=5%).

RESULTADOS: A diferença geral da cor foi reduzida quando se empregou LED Azul e Luz Halógena, sendo que o desempenho do peróxido de hidrogênio a 38% foi intensificado dependendo da fonte de luz utilizada. A avaliação quantitativa de cor, obtida por espectrofotômetro e pela escala de cor Vita Clássico, foram coincidentes.

CONCLUSÃO: O tipo de fonte de luz empregada interfere na eficácia do agente clareador.

Palavras-chave: Clareamento dental; fotoativação; diodos emissores de luz

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

Received: June 22, 2009

Accepted: November 24, 2009

Conflict of Interest Statement: The authors state that there are no financial and personal conflicts of interest that could have inappropriately influenced their work.

• 1. McGuckin RS, Babin JF, Meyer BJ. Alterations in human enamel surface morphology following vital bleaching. J Prosthet Dent 1992;68:754-60.
• 2. Shannon H, Spencer P, Gross K, Tira D. Characterization of enamel exposed to 10% carbamide peroxide bleaching agents. Quintessence Int 1993;24:39-44.
• 3. McCraken MS, Haywood VB. Demineralization effects of 10% carbamide peroxide. J Dent 1996;24:395-8.
• 4. Araujo RM, Torres CR, Araújo MA. Influência dos agentes clareadores e um refrigerante à base de cola na microdureza do esmalte dental e a ação da saliva na superfície tratada. Rev Odonto Ciênc 2006;21:118-204.
• 5. Mokhlis GR, Matis BA, Cochran MA, Eckert GJ. A clinical evaluation of carbamide peroxide and hydrogen peroxide whitening agents during daytime use. J Am Dent Assoc 2000;131:1269-77.
• 6. Buchalla W, Attin T. External bleaching therapy with activation by heat, light or laser - a systematic review. Dent Mater 2007; 23:586-96.
• 7. Zhang C, Wang X, Kinoshita J, Zhao B, Toko T, Kimura Y, Masumoto K Effects of KTP laser irradiation, diode laser and LED on tooth bleaching: a comparative study. Photomed Laser Surg 2007 2007;25:91-5.
• 8. Luk K, Tam L, Hubert M. Effect of light energy on peroxide tooth bleaching. J Am Dent Assoc 2004;135:194-201;228-9.
• 9. Eldeniz AU, Usumez A, Usumez S, Ozturk N. Pulpal temperature rise during light-activated bleaching. J Biomed Mater Res B Appl Biomater 2005;72:254-9.
• 10. Wetter NU, Barroso MC, Pelino JE. Dental bleaching efficacy with diode laser and LED irradiation: an in vitro study. Lasers Surg Med 2004;35:254-8.
• 11. Dostalova T, Jelinkova H, Housova D, Sulc J, Nemec M, Miyagi M, Brugnera Junior A, Zanin F. Diode laser-activated bleaching. Braz Dent J 2004;15:SI3-8.
• 12. Torres CR, Borges AB, Kubo CH, Gonçalves SE, Araújo RM, Celaschi S et al. Clareamento dental com fontes híbridas LED/Laser. São Paulo: Santos; 2007.
• 13. Sulieman M, Addy M, MacDonald E, Rees JS. The effect of hydrogen peroxide concentration on the outcome of tooth whitening: an in vitro study. J Dent 2004;32:295-9.
• 14. Luo W, Westhand S, Brunton P, Ellwood R, Prety IA, Mohan N. Comparison of the ability of different colour indices to assess changes in tooth whiteness. J Dent 2007;35:109-16.
• 15. Ishikawa-Nagai S, Terui T, Ishibashi K, Weber HP, Ferguson M. Comparison of effectiveness of two 10% carbamide peroxide tooth-bleaching systems using spectrophotometric measurements. J Esthet Rest Dent 2004;16:368-76.
• 16. Goodking RJ, Schwabacher, WB. Use of a fiber-optic colorimeter for in vivo color measurements of 2830 anterior teeth. J Prosthet Dent 1987;58:535-42.
• 17. Reyto R. Laser tooth whitening. J Esthet Dent 1998;42:7557-62.
• 18. Sulieman M, Addy M, MacDonald E, Rees JS. The bleaching depth of a 35% hydrogen peroxide based in-office product: a study in vitro. J Dent 2005;33:33-40.
• 19. Yazici AR, Khanbodaghi A, Kugel G. Effects of an in-office bleaching system (ZOOM) on pulp chamber temperature in vitro. J Contemp Dent Pract 2007;8:19-26.
• 20. Tavares M, Stultz J, Newman M; Smith V, Kent R, Carpino E, Goodson JM. Light augments tooth whitening with peroxide. J Am Dent Assoc 2003;134:167-75.
• 21. Cronin MJ, Charles CA, Zhao Q, Dembling WZ. Compararison of two over-the-counter tooth whitening products using a novel system. Compend Contin Educ Dent 2005;26:140-7.

Publication Dates

• Publication in this collection
  26 Aug 2011
• Date of issue
  2010

History

• Received
  22 June 2009
• Accepted
  24 Nov 2009