Interfacial fracture toughness of self‐adhesive and conventional flowable composites to dentin using different dentin pretreatments

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Abstract
Aim: The aim of the present study was to investigate the effect of different dentin pretreatments on the interfacial fracture toughness of a self‐adhesive flowable composite to dentin compared with that of a conventional flowable composite.Methods: Caries‐free human molars were sectioned to expose the underlying dentin and were randomly divided into seven groups (N = 12) of dentin pretreatments bonded to a self‐adhesive flowable composite (Vetise Flow, VF) or a conventional flowable composite (Clearfil Magesty Flow, CM). For VF; Control group (group C‐VF), there was no pretreatment, self‐etching primer (SP), oxalate dentin desensitizer (OX), and chlorhexidine gluconate (CH) were used. For CM; SP (group SP‐CM), OX followed by SP (OX‐CM), and CH followed by SP (CH‐CM) were used. The interfacial fracture toughness was measured using a universal testing machine. Data were analyzed by Kruskal‐Wallis test and analysis of variance.Results: For VF, the fracture toughness of SP‐VF was significantly higher than that of other groups. For CM, a significantly higher fracture toughness for SP‐CM than that of OX‐CM was found. For all dentin pretreatments, the fracture toughness values were significantly higher for CM compared with the VF.Conclusions: The self‐adhesive flowable composite had reduced bonding efficacy to dentin compared with that of the conventional flowable composite, regardless of the type of dentin pretreatment.
Funding Information
  • Tehran University of Medical Sciences and Health Services

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