GD565 - Evaluation of the push-out bond strength of fiber posts in canals treated with conventional or ultrasonic preparation protocols-GD565 Article

GD565 Article

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This in vitro study compared conventional and ultrasonic methods for preparing root canals to receive glass fiber posts. Twenty extracted human maxillary central incisors were obturated, then randomly assigned to preparation with Gates-Glidden and Largo drills plus post-system burs, or Clearsonic ultrasonic tips. Microcomputed tomography confirmed filling-material removal. Posts were cemented, and push-out bond strength and failure modes were assessed in cervical, middle, and apical root sections.<br /><br />Ultrasonic preparation produced significantly higher bond strengths than conventional preparation in all three root thirds: approximately 9.64–10.60 MPa versus 3.47–5.83 MPa. Strength did not differ significantly among root thirds within either group. Adhesive failure was the most common failure mode, with no significant difference in failure patterns between groups.<br /><br />The findings support ultrasonic preparation as a potentially effective way to improve fiber-post adhesion compared with the conventional mechanical protocol. However, the study was limited by its small sample, use of only one tooth type, and in vitro design; larger and clinical studies are needed to establish whether the results apply to varied canal anatomies and long-term treatment outcomes.

Keywords

root canal preparation

glass fiber posts

ultrasonic tips

push-out bond strength

microcomputed tomography

adhesive failure

endodontic treatment

conventional drills

in vitro study

root thirds