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Fracture resistance among post and core systems: An in vitro study.
Kamil Shahnawaz1, Swati Sagar1, Kartik Salarias2
1Department of Dentistry, Darbhanga Medical College & Hospital, Laheriasarai, Darbhanga, Bihar-846003, India.
Bioinformation
|June 12, 2026
Summary
Fiber posts offer superior fracture resistance and promote repairable root fractures in endodontically treated teeth compared to metal posts. This research supports fiber posts for better long-term tooth preservation.
Area of Science:
- Dental Materials Science
- Biomechanical Engineering
- Restorative Dentistry
Background:
- Endodontically treated teeth have compromised structural integrity, increasing fracture risk.
- Post-and-core systems are used to restore these teeth, but their impact on fracture resistance varies.
- Understanding failure modes is crucial for selecting optimal restorative materials.
Purpose of the Study:
- To compare the fracture resistance and failure patterns of cast metal, prefabricated metal, and fiber post-and-core systems.
- To evaluate the biomechanical performance of different post materials under standardized loading.
- To provide evidence for superior restorative options for endodontically treated teeth.
Main Methods:
- Thirty endodontically treated mandibular premolars were restored with either cast metal, prefabricated metal, or fiber posts.
- Restored teeth were subjected to oblique compressive loading at 135°C until failure.
- Fracture resistance (N) and failure patterns (favorable vs. unfavorable) were recorded and analyzed.
Main Results:
- Fiber posts demonstrated significantly higher fracture resistance (615 ± 50 N) compared to metal posts.
- Fiber post restorations predominantly resulted in favorable, repairable root fractures (80%).
- Metal posts exhibited lower fracture resistance and predominantly unfavorable, non-repairable root fractures (p < 0.001).
Conclusions:
- Fiber post-and-core systems provide superior biomechanical support and fracture resistance for endodontically treated teeth.
- Fiber posts promote favorable fracture patterns, enhancing the potential for tooth repair.
- This study provides controlled evidence supporting the use of fiber posts as a preferred restorative option to preserve root integrity.
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