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Retrospective clinical study of tooth-supported single crowns: A multifactor analysis
Mohammed Hawthan1,2, Bruno R Chrcanovic1, Christel Larsson1
1Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
European Journal of Oral Sciences
|May 25, 2022
Summary
This study found that anterior tooth-supported single crowns, non-vital abutments, and bruxism significantly impact crown survival and complications. These factors increase the risk of failure, affecting long-term dental restoration outcomes.
Area of Science:
- Dental Restorations
- Prosthodontics
- Clinical Dentistry
Background:
- Tooth-supported single crowns are common dental restorations.
- Understanding factors influencing their survival is crucial for patient outcomes.
- Biological and technical complications can compromise restoration longevity.
Purpose of the Study:
- To investigate factors affecting the survival of tooth-supported single crowns.
- To assess biological and technical complications associated with these restorations.
- To identify predictors of single crown failure.
Main Methods:
- Retrospective study of 1037 single crowns in 401 patients.
- Minimum follow-up of 6 months, with a mean follow-up of 134.8 months.
- Life-table survival analysis and Cox regression for covariate analysis.
Main Results:
- Cumulative survival rates were 89.9% (5 years) and 80.9% (10 years).
- Main failure reasons: loss of retention, tooth loss, and fracture.
- Anterior placement, non-vital abutments, and bruxism significantly increased failure risk.
Conclusions:
- Anterior single crowns, non-vital abutments, and bruxism are associated with increased failure risk.
- These factors may elevate the prevalence of technical and biological complications.
- Patient age/sex, crown location, tooth type, post/core presence, material, provider, and smoking did not significantly influence survival.
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