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Stress analyses of four prefabricated posts
T S Thorsteinsson1, P Yaman, R G Craig
1Department of Cardiology and General Dentistry, University of Michigan, School of Dentistry, Ann Arbor.
The Journal of Prosthetic Dentistry
|January 1, 1992
Summary
This study compared stress in dental posts for endodontically treated teeth. Threaded posts concentrated stress at engagement points, while the nonthreaded post showed higher apical stress.
Area of Science:
- Dental Materials Science
- Biomechanical Engineering
- Restorative Dentistry
Background:
- Post-endodontic restorations require careful material selection to ensure tooth longevity.
- Prefabricated posts are commonly used, but their impact on stress distribution is critical.
- Understanding stress concentration is vital for preventing root fractures.
Purpose of the Study:
- To compare the stress distribution induced by different types of prefabricated posts.
- To analyze stress concentration at post installation and under various loading conditions.
- To evaluate the biomechanical performance of threaded versus nonthreaded posts.
Main Methods:
- A two-dimensional photoelastic stress analysis was employed.
- Four commercial posts were tested: three threaded (VLock, Radix Anchor, Flexi-Post) and one nonthreaded (Para-Post Plus).
- Stress was measured during installation and under vertical and inclined loads.
Main Results:
- Stress was induced at the post-model interface during installation and loading.
- The nonthreaded Para-Post Plus exhibited higher apical stress.
- Threaded posts concentrated stress at their engaging threads or flanges.
Conclusions:
- The design of prefabricated posts significantly influences stress distribution in endodontically treated teeth.
- Threaded posts may concentrate stress at specific engagement areas.
- Nonthreaded posts might lead to higher stress at the apex, potentially influencing fracture risk.