Lasers in Medical Science

, Volume 23, Issue 2, pp 117–124 | Cite as

Micro-shear bond strength of Er:YAG-laser-treated dentin

  • Rubens C. R. de Carvalho
  • Patricia M. de Freitas
  • Masayuki Otsuki
  • Carlos P. de Eduardo
  • Junji Tagami
Original article


This study tested if dentin adhesion is affected by Er:YAG laser. Ninety dentin disks were divided in groups (n = 10): G1, control; G2, Er:YAG laser 150 mJ, 90° contact, 38.8 J/cm2; G3, Er:YAG laser 70 mJ, 90° contact, 18.1 J/cm2; G4, Er:YAG laser 150 mJ, 90° non-contact, 1.44 J/cm2; G5, Er:YAG laser 70 mJ, 90° non-contact, 0.67 J/cm2; G6, Er:YAG laser 150 mJ, 45° contact, 37.5 J/cm2; G7, Er:YAG laser 70 mJ, 45° contact, 17.5 J/cm2; G8, Er:YAG laser 150 mJ, 45° non-contact, 1.55 J/cm2; and G9, Er:YAG laser 70 mJ, 45° non-contact, 0.72 J/cm2. Bonding procedures were carried out and the micro-shear-bond strength (MSBS) test was performed. The adhesive surfaces were analyzed under SEM. Two-way ANOVA and multiple comparison tests revealed that MSBS was significantly influenced by the laser irradiation (p < 0.05). Mean values (MPa) of the MSBS test were: G1 (44.97 ± 6.36), G2 (23.83 ± 2.46), G3 (30.26 ± 2.57), G4 (35.29 ± 3.74), G5 (41.90 ± 4.95), G6 (27.48 ± 2.11), G7 (34.61 ± 2.91), G8 (37.16 ± 1.96), and G9 (41.74 ± 1.60). It was concluded that the Er:YAG laser can constitute an alternative tool for dentin treatment before bonding procedures.


Dentin Er:YAG laser Micro-shear bond strength Morphology Self-etching primers 



The authors would like to express their gratitude to the Tokyo Medical and Dental University and to the Committee of International Cooperation of the University of São Paulo (CCInt/USP) for making the present study feasible. In addition, we would like to thank the Kuraray (Japan), Kota (Brazil), and the State of São Paulo Research Foundation / FAPESP (São Paulo, Brazil).


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Copyright information

© Springer-Verlag London Limited 2007

Authors and Affiliations

  • Rubens C. R. de Carvalho
    • 1
    • 4
  • Patricia M. de Freitas
    • 1
  • Masayuki Otsuki
    • 2
  • Carlos P. de Eduardo
    • 1
  • Junji Tagami
    • 3
  1. 1.Department of Restorative Dentistry, School of Dentistry of São PauloUniversity of São Paulo (USP)Sao PauloBrazil
  2. 2.Cariology and Operative Dentistry, Graduate School of DentistryTokyo Medical and Dental UniversityTokyoJapan
  3. 3.Department of Restorative SciencesTokyo Medical and Dental UniversityTokyoJapan
  4. 4.Departamento de Dentística—Faculdade de Odontologia de São PauloUSPSao PauloBrazil

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