Abstract
ObjectivesThe aim of this study was to evaluate the effects of C-factor and resin volume on the regional bond strength of dual-cure luting resin to root canal dentine. MethodsTwelve single-root human premolars were decoronated and post space prepared to a depth of 8mm, with a diameter of 1.5mm for six roots and 1.75mm for the other six. Root canal dentine was treated with a dual-cure bonding system and light-cured for 20s. Specimens were filled with a dual-cure resin composite with or without insertion of 1.4-mm-diameter light-transmitting glass fibre posts, followed by light-curing for 60s from the coronal direction. After 24h water storage, each specimen was serially sliced into eight 0.6mm×0.6mm thick beams for a microtensile bond strength test. Failure modes were observed using SEM. Bond strength data were divided into coronal and apical regions and statistically analysed. ResultsFor both sizes of post space, bond strengths dramatically decreased when fibre posts were inserted. There were no significant differences in microtensile bond strength between 1.5mm and 1.75mm canal width, regardless of fibre post insertion. Regional differences in bond strength were found only in the resin-filled canals. Conclusions: The increase of C-factor of the root canal system by insertion of a fibre post had a detrimental effect on the bond strength to root canal dentine. On the other hand, the change of resin volume had no significant effect on bonding.
Published Version
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