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Stresses in Premolars Restored Using Different Post-and-Core and Crown Materials: A Finite Element Analysis Study
The International Journal of Prosthodontics
|March 27, 2024
Summary
Glass-fiber and carbon-fiber posts (GFRC, CFRC) offer better stress distribution in restored premolars compared to metal posts (MPC). Leucite-reinforced ceramic crowns (LRC) transmit less stress than composite resin crowns (CC).
Area of Science:
- Biomaterials Science
- Dental Materials
- Finite Element Analysis in Dentistry
Background:
- Restoring severely damaged premolars often requires post-and-core systems and crowns.
- Understanding stress distribution within these restorations is crucial for long-term success.
- Previous studies have explored various materials, but comparative analysis of combined systems is ongoing.
Purpose of the Study:
- To evaluate the impact of three post-and-core systems (GFRC, CFRC, MPC) and two crown materials (LRC, CC) on stress patterns in restored premolars.
- To utilize finite element analysis (FEA) for detailed stress mapping under occlusal loading.
Main Methods:
- A 3D finite element model of a maxillary second premolar was developed.
- Six restorative configurations were simulated: GFRC/CFRC/MPC posts combined with LRC or CC crowns.
- Occlusal loading (150 N) was applied, and von Mises and maximum principal stresses were calculated.
Main Results:
- Crown and dentin stresses were similar across groups, but stress distribution varied.
- Metal cast post-and-core (MPC) with composite crown (CC) showed maximum stresses at the post preparation cavity.
- Carbon-fiber-reinforced composite (CFRC) posts exhibited lower stress than glass-fiber-reinforced composite (GFRC) and MPC posts. CC restorations led to higher post-and-core stresses than leucite-reinforced glass-ceramic (LRC) restorations.
Conclusions:
- Glass-fiber and carbon-fiber posts demonstrate favorable stress distribution in dentin and restorative materials.
- Metal posts increase stress in the core, post, and cement.
- More rigid leucite-reinforced glass-ceramic crowns transmit less stress to underlying components compared to composite resin crowns.
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