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VOLUME 15 , ISSUE 2 ( March-April, 2014 ) > List of Articles

RESEARCH ARTICLE

Fracture Resistance of Teeth Submitted to Several Internal Bleaching Protocols

Renato de Toledo Leonardo, Edson Alves de Campos, Katia Cristina Keine, Milton Carlos Kuga, Flávia Angélica Guiotti, Carolina Andolfatto, Norberto Batista de Faria-Júnior, Andrea Abi Rached Dantas

Citation Information : de Toledo Leonardo R, de Campos EA, Keine KC, Kuga MC, Guiotti FA, Andolfatto C, de Faria-Júnior NB, Dantas AA. Fracture Resistance of Teeth Submitted to Several Internal Bleaching Protocols. J Contemp Dent Pract 2014; 15 (2):186-189.

DOI: 10.5005/jp-journals-10024-1512

Published Online: 01-10-2014

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


Abstract

Aim

The aim of this study was to evaluate the fracture resistance of teeth submitted to several internal bleaching protocols using 35% hydrogen peroxide (35HP), 37% carbamide peroxide (37CP), 15% hydrogen peroxide with titanium dioxide nanoparticles (15HPTiO2) photoactivated by LED-laser or sodium perborate (SP).

Materials and methods

After endodontic treatment, fifty bovine extracted teeth were divided into five groups (n = 10): G1—unbleached; G2—35HP; G3—37CP; G4—15HPTiO2 photoactivated by LED-laser and G5—SP. In the G2 and G4, the bleaching protocol was applied in 4 sessions, with 7 days intervals between each session. In the G3 and G5, the materials were kept in the pulp teeth for 21 days, but replaced every 7 days. After 21 days, the teeth were subjected to compressive load at a cross head speed of 0.5 mm/min, applied at 135° to the long axis of the root using an eletromechanical testing machine, until teeth fracture. The data were submitted to ANOVA and Tukey tests (á = 5%).

Results

The 35HP, 37CP, 15HPTiO2 and SP showed similar fracture resistance teeth reduction (p > 0.05). All bleaching treatments reduced the fracture resistance compared to unbleached teeth (p < 0.05).

Conclusion

All bleaching protocols reduced the fracture resistance of endodontically-treated teeth, but there were no differences between each other.

Clinical significance

There are several internal bleaching protocols using hydrogen peroxide in different concentrations and activation methods. This study evaluated its effects on fracture resistance in endodontically-treated teeth.

How to cite this article

de Toledo Leonardo R, Kuga MC, Guiotti FA, Andolfatto C, de Faria-Júnior NB, de Campos EA, Keine KC, Dantas AAR. Fracture Resistance of Teeth Submitted to Several Internal Bleaching Protocols. J Contemp Dent Pract 2014;15(2):186-189.


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  1. Review of the current status of tooth whitening with the walking bleach technique. Int Endod J 2003;36:313-329.
  2. Effect of traditional and alternative intracoronal bleaching agents on microhardness of human dentine. J Oral Rehabil 2004;31:811-816.
  3. Nonvital tooth bleaching: a review of the literature and clinical procedures. J Endod 2008;34:394-407.
  4. Decomposition rate of hydrogen peroxide bleaching agents under various chemical and physical conditions. J Prosthet Dent 1993;69:46-48.
  5. Stability of hydrogen peroxide as a bleaching agent. Gen Dent 1985;33:121-122.
  6. Coronal resistance to fracture of endodontically treated teeth submitted to lightactivated bleaching. J Dent 2008;36:935-939.
  7. Ex-vivo evaluation of the intrapulpal temperature variation and fracture strength in teeth subjected to different external bleaching protocols. Braz Dent J 2011;22:32-36.
  8. Effect of light-enhanced bleaching on in vitro surface and intrapulpal temperature rise. J Esthet Restor Dent 2001;13:370-378.
  9. Influence of the quantity of coloring agent in bleaching gels activated with LED/laser appliances on bleaching efficiency. Eur J Esthet Dent 2009;4:178-186.
  10. Tooth discolouration and staining: a review of the literature. Br Dent J 2001;190:309-316.
  11. Effect of photochemical whitening gel with and without TiO2 and different wavelengths. Braz J Oral Sci 2010;9:393-397.
  12. Influence of chemical or physical catalysts on high concentration bleaching agents. Eur J Esthet Dent 2011;6:454-466.
  13. Effects of combined use of light irradiation and 35% hydrogen peroxide for dental bleaching on human enamel mineral content. Photomed Laser Surg 2010;28:533-538.
  14. Peroxide bleaching agent effects on enamel surface microhardness, roughness and morphology. Braz Oral Res 2004;18:306-311.
  15. Fracture resistance and failure pattern of teeth submitted to internal bleaching with 37% carbamide peroxide, with application of different restorative procedures. J Appl Oral Sci 2006;14:247-252.
  16. Fracture strength of incisor crowns after intracoronal bleaching with sodium percarbonate. Dent Traumatol 2012;28:238-242.
  17. An evaluation of the crown-down pressureless technique. J Endod 1984;10:491-498.
  18. Hydroxyl radical activity in thermocatalytically bleached root-filled teeth. Endod Dent Traumatol 1997;13:119-125.
  19. Effect of hydrogen peroxide and sodium perborate on biomechanical properties of human dentin. J Endod 2002;28:62-67.
  20. Effect of hydrogen peroxide on intertubular dentine. J Dent 2005;33:363-369.
  21. Effect of intracoronal bleaching agents on dentin microhardness. J Endod 2007;33:460-462.
  22. Effect of different restorative procedures on the fracture resistance of teeth submitted to internal bleaching. Braz Oral Res 2012;26:77-82.
  23. Fracture resistance of teeth subjected to internal bleaching and restored with different procedures. Braz Dent J 2011;22:117-121.
  24. The effect of bleaching time on dentin fracture toughness in vitro. J Esthet Restor Dent 2010;22:179-184.
  25. Fracture resistance of endodontically-treated teeth: effect of combination bleaching and an antioxidant. Oper Dent 2010;35:530-537.
  26. Tensile properties of mineralized and demineralized human and bovine dentin. J Dent Res 1994;73:1205-1211.
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