Microtensile bond strength to Er:YAG laser pretreated dentin

Authors

  • Roberta Marques da Graça Lopes Special Laboratory of Lasers in Dentistry (LELO) – Department of Restorative Dentistry – School of Dentistry – University of São Paulo (USP) – São Paulo – SP – Brazil.
  • Carolina Steiner-Oliveira Special Laboratory of Lasers in Dentistry (LELO) – Department of Restorative Dentistry – School of Dentistry – University of São Paulo (USP) – São Paulo – SP – Brazil.
  • Ana Cecília Côrrea Aranha Special Laboratory of Lasers in Dentistry (LELO) – Department of Restorative Dentistry – School of Dentistry – University of São Paulo (USP) – São Paulo – SP – Brazil.
  • Carina Strano Castellan Department of Dental Materials – School of Dentistry – University of São Paulo (USP) – São Paulo – SP – Brazil.
  • Marina Stella Bello-Silva Special Laboratory of Lasers in Dentistry (LELO) – Department of Restorative Dentistry – School of Dentistry – University of São Paulo (USP) – São Paulo – SP – Brazil. Center for Reseacrh and Innovation in Laser – Universidade Nove de Julho – São Paulo – SP – Brazil.
  • Nilson Dias Vieira Júnior Center of Lasers and Applications – Energy and Nuclear Research Institute (IPEN) – São Paulo – SP – Brazil.
  • Carlos de Paula Eduardo Special Laboratory of Lasers in Dentistry (LELO) – Department of Restorative Dentistry – School of Dentistry – University of São Paulo (USP) – São Paulo – SP – Brazil.

DOI:

https://doi.org/10.14295/bds.2014.v17i1.954

Abstract

Objective: Although the effects of Er:YAG  (erbium:yttrium aluminium garnet) laser on cavity  preparation as well as on dentin bonding to composite  have been described in the literature, the longevity of  this bond is still unknown. So, this study evaluated the  short-term microtensile bond strength to dentin samples  after different protocols of surface treatment. Materials  and Methods: 60 bovine incisors were cleaned, worn  to expose a dentin area and subdivided into groups  according to treatment conditions: surface treatment  (no irradiation – control group; dentin irradiation with  Er:YAG laser 250 mJ/4 Hz; 160 mJ/10 Hz), adhesive  system (Clearfil SE Bond - Kuraray; Adper Single Bond  2 - 3M/ESPE), and storage time (24 h; 90 days). After  adhesive procedures, a block of Z250 composite resin  (3M/ESPE) was built-up on each tooth. The teeth were  sectioned to obtain samples for the microtensile bond  strength test. Half of the samples were tested 24 h  after cutting, and the other half were stored in distilled  water for 90 days before testing. Intergroup analysis  was also performed considering the same variables  using ANOVA for multiple comparisons with Tukey test  with a significance level of 5%. Data showed weaker  bond strength for groups previously treated with laser  (p < 0.05) compared with control groups, and these  were not influenced by adhesive system used, nor by  storage period. Stereoscopic microscope observations  showed that fractures occurred predominantly at the  adhesive interface in the groups irradiated with the  Er:YAG laser. Conclusion: Within the parameters and  variables used in this study, the Er:YAG laser could  not provide an additional improvement in dentin-resin  bond strength, irrespective of the type of adhesive  system used or the storage period evaluated. 

KEYWORDS
Adhesive systems; Er:YAG laser; Microtensile bond
strength.

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Published

2014-01-27

Issue

Vol. 17 No. 1 (2014): Jan. - Mar. / 2014 - Published March 2014

Section

Clinical or Laboratorial Research