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Fluoride penetration into dentine abutments in vitro
K H Figures1, B Ellis, D J Lamb
1Department of Oral and Maxillofacial Surgery, University of Sheffield, UK.
Caries Research
|January 1, 1990
Summary
High fluoride concentrations (2.0%) are needed for significant ion diffusion into dentine. Lower concentrations showed limited penetration, questioning the effectiveness of patient-administered fluoride treatments for overdenture cases.
Area of Science:
- Dental Materials Science
- Cariology
- Biomaterials
Background:
- Overdentures require careful management of remaining tooth structure.
- Fluoride application is a common method for caries prevention.
- Understanding fluoride diffusion in dentine is crucial for effective prophylaxis.
Purpose of the Study:
- To investigate the in vitro diffusion of fluoride ions into human dentine.
- To assess the penetration depth of fluoride from various sodium fluoride concentrations.
- To evaluate the efficacy of low-concentration fluoride treatments in overdenture preparations.
Main Methods:
- Human canine teeth, decoronated and prepared for overdentures, were used.
- Preparations were immersed for 7 days in neutral-pH sodium fluoride solutions (0.05% to 2.0%).
- Fluoride penetration into dentine was analyzed using electron microprobe analysis.
Main Results:
- Significant fluoride ion penetration was observed only at high concentrations (2.0% sodium fluoride).
- Fluoride penetrated up to 400 microns in peritubular dentine.
- Penetration into intertubular dentine was limited to approximately 100 microns.
Conclusions:
- Low-concentration fluoride treatments may not effectively penetrate dentine in overdenture preparations.
- The findings challenge the efficacy of typical patient-administered fluoride prophylaxis in these cases.
- Further research is needed to optimize fluoride delivery for overdenture patients.