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Effect of Er: Yag Laser on Microtensile Bond Strength of Bleached Dentin to Composite Publisher



Rezaei M1 ; Aliasghar E2 ; Rezvani MB3 ; Chiniforush N4 ; Moradi Z5
Authors
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Authors Affiliations
  1. 1. Department of Operative Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  2. 2. Private Practice, Tehran, Iran
  3. 3. Department of Operative Dentistry, Shahed University, Tehran, Iran
  4. 4. Laser Research Center of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Department of Operative Dentistry, Tehran University of Medical Sciences, Tehran, Iran

Source: Journal of Lasers in Medical Sciences Published:2019


Abstract

Introduction: In non-vital tooth bleaching, dentin is in direct contact with the bleaching agent, 1 to 3-week delay is needed to eliminate free radicals from tooth structure. The present study aimed to evaluate the effect of irradiation of Er: YAG laser on immediate microtensile bond strength of bleached dentin to composite. Methods: Sixty sounds human teeth were collected and randomly divided into 4 groups (n = 15): no bleaching (NB), opalescence endo hydrogen peroxide (HP) gel bleaching, sodium perborate (SP) bleaching and laser bleaching with heydent gel (LB). The groups were divided into 3 subgroups (n = 5): no surface treatment, Er: YAG laser irradiation and 10% sodium ascorbate (SA). All samples were restored and underwent microtensile bond strength testing. Statistical analysis was carried out using one-way and two-way ANOVA. Results: Bond strength in NB-SA group had a significant difference with the NB group (P < 0.05) while no significant difference was noted between NB and NB-Er groups (P = 0.55). Application of SA and Er: YAG laser after bleaching with SP did not enhance the bond strength (P = 0.07). Conclusion: Application of SA and Er: YAG laser after HP gel bleaching significantly enhanced the bond strength. Application of Er: YAG laser after internal bleaching with HP gel could enhance the bond strength. © 2018 J Lasers Med Sci.