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Correlation between bond strength and nanomechanical properties of adhesive interface

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Abstract

Objectives

The aims of this study were to evaluate the nanohardness and Young’s modulus of the adhesive-dentin interface and to correlate them with the microtensile bond strength (μTBS) after storage in water for 24 h and 6 months.

Methods

Eighty human third molar teeth were bonded to composite resin with the Adper Scotchbond Multipurpose (SBMP), Adper Single Bond 2 (SB2), Clearfil SE Bond (CSE) or Clearfil S3 Bond (CS3) adhesive systems and stored in water for 24 h and 6 months. Three bonded teeth were selected for each group for nanoindentation methodology to obtain the nanohardness and modulus values (n = 3), while seven bonded teeth each group were used for μTBS (n = 7). Data were analyzed by two-way ANOVA and Tukey’s test (α = 0.05). Spearman correlation between nanohardness and modulus and μTBS values was also calculated.

Results

Nanohardness and Young’s modulus values for the dentin and hybrid layer were not significantly different regardless of the adhesive system or water storage periods (p > 0.05). Nanohardness and Young’s modulus values for the adhesive layer were significantly higher for SB2 than for SBMP, CSE, and CS3 systems in both water storage periods. The μTBS values for SBMP and CSE were significantly higher than for SB2 and CS3 in both storage periods. An inverse correlation between Young’s modulus and μTBS was observed for the adhesive layer.

Conclusion

The water storage periods did not alter nanohardness, Young’s modulus, and μTBS of adhesives. The adhesive layer of SB2 showed the highest nanohardness and Young’s modulus, but the highest dentin bond strength was obtained with SBMP and CSE. Thus, a lower Young’s modulus yielded high bond strength.

Clinical relevance

The inverse correlation between the Young’s modulus of adhesive systems and dentin bond strength suggests adequate resistance of the adhesive to elastic deformation under stress, which are important properties to predict the success of the dental restoration.

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Acknowledgments

This study was supported by Coordination for the Improvement of Higher Education Personnel (CAPES # 1777-2014) how scholarship grant of the first author. The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Division of Dental Materials, Piracicaba Dental School, State University of Campinas, UNICAMP, Av. Limeira, 901 Areião P.O. Box 52, Piracicaba, SP, 13414-903, Brazil

    Pedro Henrique Freitas, Marcelo Giannini, Américo Bortolazzo Correr, Lourenço Correr-Sobrinho & Simonides Consani

  2. Department of Restorative Dentistry, Division of Dental Materials, College of Dentistry, Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada

    Pedro Henrique Freitas & Rodrigo França

Authors
  1. Pedro Henrique Freitas
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  2. Marcelo Giannini
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  4. Américo Bortolazzo Correr
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  5. Lourenço Correr-Sobrinho
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Corresponding author

Correspondence to Pedro Henrique Freitas.

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Conflict of interest

The authors declare that they have no conflict of interest.

Funding

The work was supported by the Coordination for the Improvement of Higher Education Personnel (CAPES # 1777–2014) and Department of Restorative Dentistry, Division of Dental Materials, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba, SP, Brazil.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors. However, extracted teeth was utilized and obtained with the patient’s informed consent. The teeth were extracted independently of this research, by clinical indication and stored in single bottle, which prevents the identification of individuals. The University of Campinas Research Ethics Committee approved this study (protocol #042/2011).

Informed consent

For this type of study, formal consent was required to obtain the extracted teeth.

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Freitas, P.H., Giannini, M., França, R. et al. Correlation between bond strength and nanomechanical properties of adhesive interface. Clin Oral Invest 21, 1055–1062 (2017). https://doi.org/10.1007/s00784-016-1847-7

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  • DOI: https://doi.org/10.1007/s00784-016-1847-7

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