Correlation between bond strength and nanomechanic

Authors: Pedro Henrique Freitas Marcelo Giannini Rodrigo França Américo Bortolazzo Correr Lourenço CorrerSobrinho Simonides Consani

Publish Date: 2016/05/25

Volume: 21, Issue: 4, Pages: 1055-1062

PDF Link

Abstract

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 twoway ANOVA and Tukey’s test α = 005 Spearman correlation between nanohardness and modulus and μTBS values was also calculatedNanohardness 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  005 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 layerThe 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 strengthThe 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 restorationThis study was supported by Coordination for the Improvement of Higher Education Personnel CAPES 17772014 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 articleThe 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 BrazilThis 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

Keywords: