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Published on: December 20, 2024
Evaluation of push-out bond strength of two endodontic post systems
Konstantinos Mastoras1, Leonidas Vasiliadis, Elizabeth Koulaouzidou
1Department of Endodontics, Division of Pathology and Therapeutics of Dental Tissues and Basic Dental Sciences, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece. kmastoras@gmail.com
Introduction:
The aim of this study was to evaluate the push-out bond strengths of a new polyfiber post system and a fiber post that were adhesively luted with a dual-cure resin cement.
Methods:
Forty single-rooted human maxillary teeth were sectioned below the cementoenamel junction, and the roots were endodontically treated. The roots were randomly divided into 2 groups of 20 specimens each according to the post type used: SpiraPost (group A; DMG, Englewood, NJ) and DT Light-Post Illusion X-RO (group B; Bisco Inc, Schaumburg, IL). All posts were cemented with dual-cure resin cement. Bonded specimens were cut into 1-mm-thick sections, and push-out tests were performed using a universal testing machine. All specimens were loaded until fracture, and the failure modes were evaluated with a stereomicroscope at 50× magnification. Representative specimens were analyzed by scanning electron microscopy.
Results:
Push-out bond strength was significantly affected by the type of post (P < .05). In all root sections, the SpiraPost push-out bond strength values were significantly higher than that those of DT Light-Post Illusion X-RO (P < .05). Cohesive failure within the post was the most frequent type of failure for the SpiraPost system.
Conclusions:
In all root segments, the SpiraPost system provided significantly increased post retention compared with the fiber post.
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