Related Experiment Video
Updated: May 19, 2026
07:42
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Evaluation of fiber post-supported restorations under simulated occlusal loading
J W W Chang1, Irwan Soo, Gary S P Cheung
1Comprehensive Dental Care (Endodontics), Faculty of Dentistry, The University of Hong Kong, Hong Kong.
The Journal of Prosthetic Dentistry
|September 5, 2012
Summary
Rigid metal posts maintained a better marginal seal in post-and-core crowns than flexible fiber posts after cyclic loading. This indicates post material rigidity is crucial for long-term restoration integrity and preventing microleakage.
Area of Science:
- Restorative Dentistry
- Dental Materials Science
Background:
- Limited data exists comparing rigid vs. flexible posts regarding marginal seal in post-and-core crowns under long-term cyclic loading.
- Understanding post material effects on restoration integrity is critical for clinical success.
Purpose of the Study:
- To evaluate the microleakage patterns of complete coverage restorations.
- To compare restorations supported by metal posts versus fiber-reinforced resin posts under simulated occlusal loads.
Main Methods:
- Thirty-six endodontically treated maxillary central incisors were restored with post-and-core supported crowns.
- Groups received either fiber posts (EasyPost Lux) or metal posts (Parapost) and underwent 120,000 cycles of 70 N loading in dye.
- A non-loaded fiber post control group was included; serial sections were analyzed for dye penetration.
Main Results:
- All loaded specimens exhibited dye penetration, with greater leakage observed on the palatal aspect.
- The fiber post group subjected to cyclic loading showed significantly increased leakage compared to the metal post and control groups (P<.05).
Conclusions:
- Post rigidity significantly impacts the marginal seal of post-and-core supported crowns.
- The palatal margin's seal is particularly affected by the post material's flexibility under occlusal stress.
