The Effect of Prefabricated vs Custom Fiber-Reinforced Posts on the Push-Out Bond Strength of Self-Adhesive Resin Cement in Simulated Flared Root Canals: An in Vitro Study
5 affiliations
- 1Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- 2Advanced Technology Dental Research Laboratory (ATDRL), Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 21589, Saudi Arabia
- 3Department of Cariology, Restorative Sciences, and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, MI 48109, USA
- 4Saudi Board Residency Program, Department of Pediatric Dentistry, King Abdullah Medical Complex, Saudi Commission for Health Specialties (SCFHS), Jeddah 11614, Saudi Arabia
- 5Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Abstract
Objectives: In this study, we aimed to evaluate the effect of post design on the push-out bond strength (PBS) of self-adhesive resin cement in simulated flared root canals. Materials and Methods: A total of 135 specimens simulating flared single root canals were fabricated using standardized 3D-printed resin (FREEPRINT® CROWN; Detax GmbH, Ettlingen, Germany) and allocated into three groups: single, double, and customized glass fiber-reinforced posts (Pillar Fiber Post, TiaDent, TX, USA). All specimens were cemented using self-adhesive resin cement (Rely XTM U200, 3M ESPE, MN, USA). The specimens were then sectioned perpendicular to the long axis into coronal, middle, and apical slices, each measuring 3 mm. After thermocycling, they were tested for their push-out bond strength. Failure modes were analyzed using stereomicroscopy. A statistical analysis was completed for PBS data using a two-way ANOVA test, and failure modes were analyzed using a Chi-square test at a significance level of α = 0.05. Results: We observed statistically significant differences in the PBS between test groups (p = 0.044*). Double-post specimens exhibited the highest PBS values at the coronal section (8.26 ± 1.54 MPa), followed by the middle section (7.77 ± 1.73 MPa). Across all root sections, the PBS of double posts (7.58 ± 2.07 MPa) significantly outperformed customized (6.76 ± 1.15 MPa) and single-post (6.73 ± 1.75 MPa) groups (p = 0.029*). The coronal third (7.44 ± 1.54 MPa) consistently showed higher PBS compared to the middle (7.15 ± 1.64 MPa) and apical (6.49 ± 1.90 MPa) thirds (p = 0.027*). Failure mode analysis revealed that customized posts predominantly failed at the post-adhesive interface, whereas double posts showed a mix of adhesive failures and single posts demonstrated more adhesive failures at the canal walls. Conclusions: The use of double fiber posts significantly enhances push-out bond strength in flared canals compared to single or customized posts. Relining techniques improved canal adaptation, but the performance here did not surpass that of double-post configurations. Clinically, the double-post approach may present a simple, practical and effective alternative to improve the bond strength of fiber-reinforced posts for flared root canal systems.
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BibTeX
@article{hajjaj2026effect,
title = {{The Effect of Prefabricated vs Custom Fiber-Reinforced Posts on the Push-Out Bond Strength of Self-Adhesive Resin Cement in Simulated Flared Root Canals: An in Vitro Study}},
author = {Maher S. Hajjaj and Lyan Y. Qari and Maram A. AlKenani and Anhar I. Basunbul and Dalea M. Bukhary and Abeer K. Tashkandi and Afnan O. Al-Zain and Hanin E. Yeslam},
journal = {Polymers},
year = {2026},
month = oct,
doi = {10.3390/polym18212641},
url = {https://www.mdpi.com/2073-4360/18/21/2641},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - The Effect of Prefabricated vs Custom Fiber-Reinforced Posts on the Push-Out Bond Strength of Self-Adhesive Resin Cement in Simulated Flared Root Canals: An in Vitro Study
AU - Maher S. Hajjaj
AU - Lyan Y. Qari
AU - Maram A. AlKenani
AU - Anhar I. Basunbul
AU - Dalea M. Bukhary
AU - Abeer K. Tashkandi
AU - Afnan O. Al-Zain
AU - Hanin E. Yeslam
PY - 2026
DA - 2026/10/25
JO - Polymers
DO - 10.3390/polym18212641
UR - https://www.mdpi.com/2073-4360/18/21/2641
AB - Objectives: In this study, we aimed to evaluate the effect of post design on the push-out bond strength (PBS) of self-adhesive resin cement in simulated flared root canals. Materials and Methods: A total of 135 specimens simulating flared single root canals were fabricated using standardized 3D-printed resin (FREEPRINT® CROWN; Detax GmbH, Ettlingen, Germany) and allocated into three groups: single, double, and customized glass fiber-reinforced posts (Pillar Fiber Post, TiaDent, TX, USA). All specimens were cemented using self-adhesive resin cement (Rely XTM U200, 3M ESPE, MN, USA). The specimens were then sectioned perpendicular to the long axis into coronal, middle, and apical slices, each measuring 3 mm. After thermocycling, they were tested for their push-out bond strength. Failure modes were analyzed using stereomicroscopy. A statistical analysis was completed for PBS data using a two-way ANOVA test, and failure modes were analyzed using a Chi-square test at a significance level of α = 0.05. Results: We observed statistically significant differences in the PBS between test groups (p = 0.044*). Double-post specimens exhibited the highest PBS values at the coronal section (8.26 ± 1.54 MPa), followed by the middle section (7.77 ± 1.73 MPa). Across all root sections, the PBS of double posts (7.58 ± 2.07 MPa) significantly outperformed customized (6.76 ± 1.15 MPa) and single-post (6.73 ± 1.75 MPa) groups (p = 0.029*). The coronal third (7.44 ± 1.54 MPa) consistently showed higher PBS compared to the middle (7.15 ± 1.64 MPa) and apical (6.49 ± 1.90 MPa) thirds (p = 0.027*). Failure mode analysis revealed that customized posts predominantly failed at the post-adhesive interface, whereas double posts showed a mix of adhesive failures and single posts demonstrated more adhesive failures at the canal walls. Conclusions: The use of double fiber posts significantly enhances push-out bond strength in flared canals compared to single or customized posts. Relining techniques improved canal adaptation, but the performance here did not surpass that of double-post configurations. Clinically, the double-post approach may present a simple, practical and effective alternative to improve the bond strength of fiber-reinforced posts for flared root canal systems.
SN - 2073-4360
ER -