Logo image
Back
Comparative Evaluation of Push-Out Bond Strength Between CAD/CAM-Milled and Anatomically Customized Fiber Posts: An In Vitro Study
Journal article   Open access   Peer reviewed

Comparative Evaluation of Push-Out Bond Strength Between CAD/CAM-Milled and Anatomically Customized Fiber Posts: An In Vitro Study

Camila Orlinda Andrade Gusmão, Vanessa Inácio Celestrino, Franciele Floriani, Amirali Zandinejad, Carlos Alberto Jurado, Washignton Steagall Jr, Rubens Nisie Tango and Alfredo Mikail Melo Mesquita
International journal of dentistry, Vol.2026(1), 4637841
09/17/2026
DOI: 10.1155/ijod/4637841
PMCID: PMC13584754
PMID: 42757225
Appears in  UI Libraries Support Open Access
url
https://doi.org/10.1155/ijod/4637841View
Published (Version of record) Open Access

Abstract

This in vitro study evaluated the push-out bond strength of two types of intraradicular fiber posts: conventional customized anatomical posts and milled fiber posts, cemented with two different strategies. Sixty bovine incisors with roots sectioned at the cementoenamel junction and standardized to a length of 15 mm were endodontically treated. All specimens were randomly assigned to four groups (  = 15) based on post type and cementation strategy; customized anatomical post cemented with self-adhesive resin cement (RelyX U200, G1); customized anatomical post cemented with dual-cure resin cement (RelyX Universal resin cement, G2); milled fiber post cemented with self-adhesive resin cement (RelyX U200 resin cement, G3); and milled fiber post cemented with dual-cure resin cement (RelyX Universal resin cement, G4). Push-out bond strength measurements (MPa) were obtained from three root sections (cervical, middle, and apical) using a universal testing machine at a speed of 0.5 mm/min until failure. The interfaces and failure modes were analyzed using scanning electron microscopy (SEM). Statistical analysis included three-way analysis of variance (ANOVA) and Tukey's post hoc test to compare groups and root sections. CAD/CAM-milled posts (G3 and G4) exhibited significantly higher bond strength (mean PBS = 13.1 ± 3.9 MPa) compared to customized anatomical posts (G1 and G2) (mean PBS = 9.7 ± 2.8 MPa) (   < 0.01). Bond strength varied significantly across root thirds ( = 0.034), with the apical and middle thirds demonstrating higher values than the cervical third. No significant difference in bond strength was observed between the two cementation strategies ( = 0.27). CAD/CAM-milled fiber posts demonstrated higher push-out bond strength than customized anatomical posts, regardless of the cementation strategy. However, these groups also exhibited a greater frequency of catastrophic failures, indicating that higher bond strength should not be interpreted as overall clinical superiority. Additional studies are needed to determine the clinical significance of these findings.
 universal resin cement milled bond strength UIOWA OA Agreement

Details

Metrics

2 Record Views
Logo image