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Retentive characteristics of an internally threaded post system
1Section of Restorative and Prosthetic Dentistry, Ohio State University, College of Dentistry, Columbus.
The Journal of Prosthetic Dentistry
|March 1, 1993
Summary
The Para-Post system demonstrated superior retention compared to experimental posts in dental applications. Both systems showed high retention strength, exceeding forces typically encountered in the human mouth.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Prosthodontics
Background:
- Post-and-core restorations are crucial for restoring function in endodontically treated teeth.
- Evaluating the retention and mechanical stability of different post systems is essential for clinical success.
Purpose of the Study:
- To compare the retention strength of a stainless-steel Para-Post system with experimental internally threaded stainless-steel posts.
- To assess the failure modes and mechanical integrity of both post systems under tensile load.
Main Methods:
- Two types of posts (Para-Post and experimental threaded posts) were cemented into extracted human teeth using zinc phosphate cement.
- Titanium alloy screws were placed into the threaded posts, and tensile forces were applied to the screws or Para-Post dowels until failure.
Main Results:
- The Para-Post system exhibited significantly greater retention than the experimental threaded posts.
- While screws deformed, neither the Para-Post dowels nor the experimental posts fractured or distorted.
- Retention values for both systems surpassed reported physiological forces in humans.
Conclusions:
- The Para-Post system offers superior retention compared to the tested experimental internally threaded posts.
- Both post systems possess adequate retention and mechanical stability for clinical use, exceeding functional demands.
- Further research could explore long-term performance and different cementation protocols.