Effect of shear bond strength of metallic orthodontic brackets bonded with and without dental adhesive

Authors

  • Jaiane Bandoli Monteiro São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil. http://orcid.org/0000-0002-7000-8265
  • Ricardo Toledo Abreu São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Restorative Dentistry – SP – Brazil. http://orcid.org/0000-0003-3260-3140
  • Lívia Salgado Department of Restorative Dentistry – Juiz de Fora Federal University – School of Dentistry (UFJF) – Juiz de Fora – MG – Brazil. http://orcid.org/0000-0002-3175-3545
  • Thais Cachuté Paradella São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Biosciences and Oral Diagnosis – SP – Brazil.
  • Ivone de Oliveira Salgado Department of Restorative Dentistry – Juiz de Fora Federal University – School of Dentistry (UFJF) – Juiz de Fora – MG – Brazil. http://orcid.org/0000-0001-6042-3863
  • Renato Cilli School of Dentistry- Juiz de Fora Federal University (UFJF) http://orcid.org/0000-0001-5202-0159

DOI:

https://doi.org/10.14295/bds.2018.v21i4.1597

Abstract

Objective: The aim of this study was to evaluate the shear bond strength (SBS) of two materials for bonding orthodontic brackets on dental enamel before and after thermocycling. Material and Methods: Forty bovine incisors were divided into four groups (n=10). All teeth were etched with 35% phosphoric acid (3M Espe). For bonding of the brackets, G1 and G2 received orthodontic composite resin (Fill Magic Ortodôntico) and G3 and G4, an adhesive (ScotchBond) was used before the orthodontic resin Transbond XT (3M Unitek). G1 and G3 were kept at 37ºC for 24h and G2 and G4 were submitted to thermocycling (5000 cycles, at 5ºC - 55ºC) prior to SBS testing, performed by a universal machine (EMIC) at 1 mm/min, with a 50kgf load cell. Results were analyzed with two-way ANOVA, followed by Tukey's test (p=0.05). Adhesive surfaces were evaluated through stereomicroscopy and classified according to the type of failure presented. Results: Surface treatment with dental adhesive presented higher SBS values, regardless thermocycling (G3: 12.01 MPa; G4: 12.36 MPa) and the lowest values occurred in G2 (8.89 MPa). For groups without adhesive and with thermocycling, a higher number of completely adhesive failures between composite and enamel were present. For groups in which dental adhesive was used, regardless thermocycling, the failures were mainly adhesive between composite and the bracket. Conclusion: Surface etching of enamel with 35% phosphoric acid with or without adhesive showed a positive effect on SBS. The application of adhesive on enamel surface contributed to the maintenance of SBS values after thermocycling.

 

Keywords

Aging; Orthodontic brackets; Composite resins; Shear strength.

Author Biographies

Jaiane Bandoli Monteiro, São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil.

Department of Dental Materials
and Prosthodontics.

Ricardo Toledo Abreu, São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Restorative Dentistry – SP – Brazil.

Department of Restorative Dentistry

Lívia Salgado, Department of Restorative Dentistry – Juiz de Fora Federal University – School of Dentistry (UFJF) – Juiz de Fora – MG – Brazil.

Department of Restorative Dentistry

Ivone de Oliveira Salgado, Department of Restorative Dentistry – Juiz de Fora Federal University – School of Dentistry (UFJF) – Juiz de Fora – MG – Brazil.

Department of Restorative Dentistry

Renato Cilli, School of Dentistry- Juiz de Fora Federal University (UFJF)

Department of Restorative Dentistry

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Published

2018-10-24

Issue

Vol. 21 No. 4 (2018): Oct. - Dec. / 2018 - Published October 2018

Section

Clinical or Laboratorial Research