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A survey of failed post-retained restorations
A Peutzfeldt1, A Sahafi, E Asmussen
1Department of Dental Materials, School of Dentistry, University of Copenhagen, Nörre Allé 20, 2200, Copenhagen, Denmark. apz@odont.ku.dk
Clinical Oral Investigations
|July 20, 2007
Summary
Tapered posts in endodontically treated teeth are linked to a higher risk of tooth fracture compared to parallel-sided posts. This study analyzed failures in post-retained restorations, finding tooth fracture most common.
Area of Science:
- Restorative Dentistry
- Endodontics
- Dental Materials Science
Background:
- Survival of endodontically treated, post-restored teeth is influenced by numerous factors challenging controlled clinical study.
- Understanding failure modes and critical factors in post-retained restorations is essential for improving long-term outcomes.
Purpose of the Study:
- To characterize and analyze reported failures of post-retained restorations.
- To identify critical factors and failure types associated with post-retained restorations.
Main Methods:
- A survey-based questionnaire was distributed to private practitioners in Denmark.
- Practitioners reported on failed post-retained restorations, gathering data on patient, tooth, material, and technique factors.
- Data from 260 questionnaires collected over 3 years were analyzed.
Main Results:
- Mean survival time until failure was 11 years; 61% failed within 10 years.
- Tooth fracture was the most frequent failure type, followed by post loosening and post fracture.
- Tapered posts showed an increased risk of tooth fracture compared to parallel-sided posts.
Conclusions:
- Tapered posts are associated with a higher risk of tooth fracture in post-retained restorations.
- The relative risk of tooth fracture increased with longer functioning time until failure.
- Fracture of the post occurred more frequently in male patients.
