Abstract

Purpose: This study aimed to compare the shear bond strength of two Korean flowable resin composites (Shoot Flow Pack, EsFlow) and two imported flowable resin composites (Filtek Supreme Flowable Restorative, G-aenial Flo X) to dentin using Adper Single Bond 2 adhesive. Materials and Methods: Forty extracted premolars were prepared, and four types of flowable resin composites were bonded to dentin surfaces using teflon molds. Shear bond strength was measured using an universal testing machine after 24-hour storage in water at 37℃, and fracture surfaces were evaluated with a scanning electron microscope. Results: Mean shear bond strengths were Shoot Flow Pack (12.68 MPa), EsFlow (12.00 MPa), Filtek Supreme Flow- able Restorative (15.29 MPa), and G-aenial Flo X (21.19 MPa). G-aenial Flo X showed significantly higher shear bond strength compared to the other three resin composites, which showed no significant differences among them. Conclusion: Korean flowable resin composites showed comparable shear bond strengths to some imported resin composites, although G-aenial Flo X exhibited significantly higher shear bond strength. Further studies are need- ed to evaluate the clinical applicability of Korean resin composites. (J Korean Dent Assoc 2025; 63(9): 283-289)