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Caries: a problem in an overdenture population.

R L Ettinger¹, J Jakobsen

¹Department of Removable Prosthodontics, College of Dentistry, University of Iowa, Iowa City 52242.

Community Dentistry and Oral Epidemiology

|February 1, 1990

Summary

This study tracked caries in teeth supporting overdentures. While a model identified risk factors, it couldn't reliably predict which patients would develop cavities.

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Area of Science:

Dentistry
Dental Prosthetics
Cariology

Background:

Overdentures are a common prosthetic solution.
Monitoring abutment tooth health is crucial for long-term success.
Caries remains a significant risk for teeth supporting prosthetic devices.

Purpose of the Study:

To assess the incidence and patterns of caries in abutment teeth of patients with overdentures.
To develop and evaluate a predictive model for identifying individuals at high risk of developing caries on abutment teeth.

Main Methods:

Longitudinal follow-up of 254 patients with overdentures constructed between 1973 and 1985.
Analysis of caries experience in abutment teeth.
Development of a Logistic Regression model incorporating variables like brushing frequency, home fluoride use, and disease/drug effects.
Evaluation of the model's predictive performance using discriminant function analysis.

Main Results:

The overall annual rate of new caries in abutment teeth was 6.5%.
Peak caries rates were observed in the 5th year post-insertion for the maxilla (15.4%) and the 4th year for the mandible (11.0%).
The developed regression model demonstrated high specificity (98.5%) but very low sensitivity (7.9%), rendering it ineffective for predicting high-risk individuals.

Conclusions:

Abutment teeth supporting overdentures are susceptible to caries, with specific temporal patterns observed in the maxilla and mandible.
Despite identifying potential risk factors, the current predictive model is not sufficiently sensitive to accurately identify patients at high risk for abutment tooth caries.
Further research is needed to develop more effective methods for predicting and preventing caries in overdenture abutment teeth.

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