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Comparative Evaluation of Two Post-Bonding Reinforcement Protocols for Fragment Reattachment in Uncomplicated Crown
Amna Afrin Kidwai1, Komal Yadav1, Nitesh Tewari1
1Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, all India Institute of Medical Sciences, New Delhi, India.
Summary
Post-bonding reinforcement significantly increases fracture resistance in teeth with uncomplicated crown fractures. Over-contouring provided the highest fracture resistance, surpassing simple reattachment alone.
Area of Science:
- Dental materials science
- Biomaterials engineering
- Restorative dentistry
Background:
- Simple reattachment is preferred for uncomplicated crown fractures.
- Post-bonding reinforcements may reduce fragment loss in various crown fractures.
- Evidence comparing reinforcement techniques is limited.
Purpose of the Study:
- To compare the fracture resistance of different post-bonding reinforcement techniques for uncomplicated crown fractures.
- To evaluate the force required to fracture simulated uncomplicated crown fractures in bovine incisors.
- To determine the optimal reinforcement strategy for dental fracture repair.
Main Methods:
- In vitro study using 20 bovine mandibular incisors per group.
- Four groups: Simple Reattachment, External Chamfer, Over-contouring, and Sound teeth.
- Fracture protocol, rehydration, bonding, storage, thermocycling, and universal testing machine analysis.
Main Results:
- Simple reattachment (Group I) required the least fracture force.
- Over-contouring (Group III) demonstrated the highest fracture force (164.75 N).
- Reinforced groups showed significantly higher fracture force than simple reattachment.
Conclusions:
- Post-bonding reinforcement significantly enhances fracture resistance compared to simple reattachment.
- Over-contouring reinforcement offers the greatest resistance to fracture.
- External chamfer reinforcement also improves fracture resistance.
