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Survival rate and failure characteristics for two post designs
A Torbjörner1, S Karlsson, P A Odman
1Department of Prosthetic Dentistry, Faculty of Odontology, University of Göteborg, Sweden.
The Journal of Prosthetic Dentistry
|May 1, 1995
Summary
This study compared two post designs, finding that parallel-sided serrated posts had a significantly lower failure rate and fewer severe complications like root fractures compared to custom-cast tapered posts.
Area of Science:
- Restorative Dentistry
- Dental Materials Science
Background:
- Post and core restorations are crucial for restoring function and aesthetics in endodontically treated teeth.
- Understanding the failure modes and rates of different post designs is essential for long-term clinical success.
Purpose of the Study:
- To compare the failure rates and characteristics of custom-cast tapered posts versus parallel-sided serrated posts.
- To evaluate the clinical performance of these two post designs over a 4-to-5-year period.
Main Methods:
- A retrospective analysis of dental records from 638 patients with 788 posts and cores was conducted.
- Failure types (technical failures, loss of retention, root fracture, post fracture) were recorded and analyzed for tapered and parallel-sided serrated posts.
- Follow-up assessments were performed 4 to 5 years post-cementation.
Main Results:
- The cumulative failure rate was 15% for tapered posts and 8% for parallel-sided serrated posts.
- Loss of retention was the most common failure for both post types.
- Root fractures, though less frequent, led to extraction in all cases and were more severe with tapered posts.
Conclusions:
- Parallel-sided serrated posts demonstrated a significantly higher success rate compared to custom-cast tapered posts.
- The choice of post design significantly impacts both the overall failure rate and the severity of complications in post and core restorations.