In Vitro Evaluation of Push-Out Bond Strength in Three Different Post Systems

Tara Kamal Talib  Bajlan; Raid Fahim  Salman

doi:10.56056/amj.2023.223

Authors

Tara Kamal Talib Bajlan B.D.S, M.Sc. Candidate of KHCMS, Khanzad Training Center for Oral Health
Raid Fahim Salman B.D.S, M.Sc., Ph.D., Assist. Professor, College of Dentistry/ Hawler Medical University, Conservative Department. Khanzad Training Center for Oral Health (Erbil training center)

DOI:

https://doi.org/10.56056/amj.2023.223

Keywords:

Bond strength, Fiber post, Relined post, Resin cement, Zirconium oxide post

Abstract

Background and objectives: Intimate adaptation to the canal walls is accomplished by custom-made posts which leave an even thickness of cement layer. Therefore, this study has been conducted for assessing the strength of push-out bond among prefabricated fiber posts, relined fiberglass posts, and zirconium posts using resin cement of self-adhesive and adhesive. The mode of failure was also assessed.

Materials and Methods: Sixty uniradicular teeth were endodontically treated. According to the kind of post system and cement utilized (n=10), the specimens were separated randomly into six groups. Zirconium oxide post, customized glass fiber post, and glass fiber post were used. The roots were divided into three discs: apical, middle, and cervical sections. After that, the discs were put through a push-out test, and the fracture mode was examined using a stereomicroscopic loupe.

Results: The highest push-out value was recorded for the relined post (8±2.83 MPa), and the lowest was registered with no significant differences for the prefabricated post (7.27±3.76 MPa). There were no significant differences in strength bond across the various posts and root regions (P?.05). Adhesive failure at the dentin-cement interfaces for the prefabricated and relined post was (60, 57) % respectively, and zirconium oxide post was (22%).

Conclusions: Relined posts may be a suitable clinical situation as a post material selection with reduced clinical steps. When posts are joined using self-adhesive and adhesive resin cement, the root region has no important influence on the strength of the bond.

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