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The purpose of this study was to evaluate the regional bond strength of a dual-cure resin core material to root canal dentin using four self-etching primer/adhesive systems. Post spaces were prepared in extracted premolars, and their root canal dentin was treated with one of the following self-etching primer/adhesive systems: ED Primer II and Clearfil Photobond, photo-cure/dual-cure systems of Clearfil Liner Bond 2V, or Clearfil SE Bond. Post spaces were filled with the dual-cure resin core material, and microtensile bond strength (uTBS) at the coronal and apical regions was measured after 24-hour storage.There were no regional differences in uTBS of the photo-cure and dual-cure systems of Clearfil Liner Bond 2V, while ,uTBS at the coronal region of Photobond and SE Bond groups were higher than those at the apical region.At the apical region, photo-cured Clearfil Liner Bond 2V exhibited significantly higher bond strength than those of the other systems.

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SUMMARYThis study evaluated the regional bond strengths of fiber posts to root canal dentin luted with dualcure resin composite. Twelve extracted human premolars were decoronated and post spaces prepared to a depth of 8 mm. The root canal dentin was treated with Clearfil SE Bond and light-cured for 20 seconds. Three posts from each of the following four types of fiber postsSnowlight, FibreKor, DT Light-Post and GC Fiber Post-were surface-treated with a mixture of Porcelain Bond Activator and Photobond, then luted into the post spaces with Clearfil DC Core Automix and light-cured for 60 seconds. After 24-hour water storage, each specimen was serially sliced into eight 0.6 x 0.6 mm-thick beams for the microtensile bond strength (µTBS) test. Failure modes were observed using SEM. The µTBS data were divided into coronal and apical regions and statistically analyzed. The highest bond strengths were obtained from FibreKor posts. Regional factors had no effect on bond strength. FibreKor and DT Light-Post specimens primarily failed at the post-resin composite interface, whereas Snowlight and GC Post cohesively failed within the post. INTRODUCTIONEsthetic non-metal fiber posts have been increasingly used to restore endodontically-treated teeth, because The bond strengths of fiber posts to root canal dentin could be affected by the characteristics of the fiber post and its bonding quality. The failure patterns of fiber-post bonded root canal dentin were dependent upon the post system.