Abstract
Objectives
To determine the effect on resin composite-to-dentin bond strength of incorporation of an acidic tin–chloride pretreatment in two adhesive systems.
Materials and methods
Human molars were ground to expose mid-coronal dentin. For microtensile bond strength (μTBS) testing, dentin was treated with Optibond FL or Clearfil SE according to one of six protocols (n = 22/group). Group 1: Phosphoric acid etching, Optibond FL Prime, Optibond FL Adhesive (manufacturer’s instructions; control); Group 2: Tin–chloride pretreatment, Optibond FL Prime, Optibond FL Adhesive; Group 3: Phosphoric acid etching, tin–chloride pretreatment, Optibond FL Prime, Optibond FL Adhesive; Group 4: Clearfil SE Primer, Clearfil SE Bond (manufacturer’s instructions; control); Group 5: Phosphoric acid etching, Clearfil SE Primer, Clearfil SE Bond; and Group 6: Tin–chloride pretreatment, Clearfil SE Primer, Clearfil SE Bond. The molars were then built up with resin composite (Clearfil Majesty Esthetic). After storage (1 week, 100 % humidity, 37 °C) the μTBS was measured and failure mode was determined. Additionally, pretreated dentin surfaces were evaluated using SEM and EDX. The μTBS results were analyzed statistically by a Welch Two Sample t-test and a Kruskal–Wallis test followed by exact Wilcoxon rank sum tests with Bonferroni–Holm adjustment for multiple testing (α = 0.05).
Results
When Optibond FL was used, partial or total replacement of phosphoric acid with tin–chloride decreased μTBS significantly. In contrast, when Clearfil SE was used, inclusion of a tin–chloride pretreatment in the adhesive procedure increased μTBS significantly.
Conclusions
Tin–chloride pretreatment had a beneficial influence on the bond promoting capacity of the MDP-containing adhesive system Clearfil SE.
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Acknowledgments
The authors would like to thank Gaba International AG, Therwil, Switzerland and Kuraray Europe, Germany for providing the materials needed. Furthermore, we thank J. Wandel and Prof. Dr. J. Hüsler, Institute of Mathematical Statistics and Actuarial Science, University of Bern for statistical analyses.
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The authors declare no conflicts of interest, real or perceived, financial or non-financial.
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Peutzfeldt, A., Koch, T., Ganss, C. et al. Effect of tin–chloride pretreatment on bond strength of two adhesive systems to dentin. Clin Oral Invest 18, 535–543 (2014). https://doi.org/10.1007/s00784-013-0975-6
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DOI: https://doi.org/10.1007/s00784-013-0975-6