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Resistance to cyclic loading of teeth restored with posts.
A Sahafi1, A Peutzfeldt, G Ravnholt
1Department of Prosthetic Dentistry, School of Dentistry, University of Copenhagen, Nörre Allé 20, DK-2200 , Copenhagen N, Denmark. ars@odont.ku.dk
Clinical Oral Investigations
|March 5, 2005
Summary
Crowned teeth without posts showed superior cyclic loading resistance. Post surface treatment significantly improved resistance, making it recommended when posts are necessary for dental restorations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Prosthodontics
Background:
- Dental posts and cores are used to retain crowns on endodontically treated teeth.
- The ferrule design is crucial for reinforcing tooth structure and improving restoration longevity.
- Understanding the influence of post characteristics on mechanical resistance is vital for clinical success.
Purpose of the Study:
- To evaluate how the presence of posts and cores, and the characteristics of posts (shape, type, surface treatment), affect the cyclic loading resistance of crowned human teeth.
- To compare the mechanical performance of different post systems and surface treatments under simulated chewing forces.
Main Methods:
- An in vitro study using human teeth restored with sterling silver crowns without a ferrule.
- Teeth were subjected to cyclic loading (600 N at 2 Hz) until failure.
- Evaluated were teeth with crowns only, cores only, post and cores, and variations in post type (cast, prefabricated), shape (parallel-sided, tapered), material (titanium alloy, glass fiber composite, zirconia), and surface treatment.
Main Results:
- Teeth restored with crowns only exhibited significantly higher cyclic loading resistance than those with cores or post and cores.
- No significant difference in resistance was found between cores only and post and cores, regardless of post surface treatment.
- Parallel-sided cast posts showed higher resistance than tapered cast posts or untreated prefabricated posts (titanium alloy, glass fiber composite).
- Parallel-sided cast posts and zirconia posts showed comparable resistance.
- Surface-treated posts demonstrated significantly increased resistance compared to untreated posts.
Conclusions:
- Crowning without posts offers superior resistance to cyclic loading compared to restorations involving posts and cores.
- When posts are necessary, surface treatment significantly enhances their resistance to cyclic loading.
- The choice of post material and design, particularly parallel-sided cast posts and surface-treated options, can influence restoration durability.