Effect of delayed insertion of composite resin on the bond strength of self-etching adhesive systems
Journal Title: RSBO - Year 2009, Vol 6, Issue 3
Abstract
Introduction: Technological advances in adhesive systems have resulted in materials with simplified techniques, which require less clinical steps.Objective: To determine the influence of immediate or delayed insertion of restorative material on the values of bond strength self-etching adhesives by using the micro tensile test. Material and methods: Bovine incisors were used, which had its vestibular surface abraded to obtain a flat dentin surface.Self-etching adhesive systems were used:Clearfil SE Bond (CSEB), Clearfil Tri S Bond (CTSB), AdheSE (ADS) and AdheSE One (ADO). The composite resin Z350 was adhered to this substrate at two different times: immediately and later (after 24 hours). Procedures were performed with simulated physiological pulpal pressure.Results were submitted to statistical analysis through Anova and Tukey’s test.Results: Except ADS, all materials tested showed reduction of the values of bond strength when composite resin was applied delayed, and only for single-step systems (CTSB and ADO) this reduction was statistically significant.Conclusion: Special care shall be taken when using single-step self-etching adhesive systems. It is recommended the application of an additional layer of hydrophobic material in order to reduce permeation of adhesive layer, and the insertion of composite resin should be initiated immediately after the photopolymerization of adhesive system.
Authors and Affiliations
Edson CAMPOS, José SAAD, Osmir OLIVEIRA JÚNIOR, Sizenando PORTO NETO, Lucas CAMPOS, Marcelo ANDRADE
Keywords
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