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In vitro fluoride release from restorative materials in water versus artificial saliva medium (SAGF)
B Levallois1, Y Fovet, L Lapeyre
1Service d'Odontologie Conservatrice, Université Montpellier I, France. yfovet@univ-montp2.fr
Dental Materials : Official Publication of the Academy of Dental Materials
|September 14, 1999
Summary
Resin-modified glass-ionomer cements (RMGICs) release more fluoride in water than artificial saliva due to calcium fluoride formation. Medium renewal affects this fluoride release and calcium fluoride layer thickness.
Area of Science:
- Dental Materials Science
- Biomaterials Research
- Fluoride Chemistry
Background:
- Fluoride release from glass-ionomer cements is crucial for caries prevention.
- Recent advancements include resin-modified glass-ionomer cements (RMGICs) and compomers.
- Understanding fluoride release dynamics in different media is essential for clinical application.
Purpose of the Study:
- To compare fluoride release from two RMGICs and one compomer.
- To investigate fluoride release in distilled water versus artificial saliva (SAGF).
- To assess the impact of medium renewal on fluoride release.
Main Methods:
- Fluoride-selective electrode potentiometry was used for measurements.
- Samples were incubated in distilled water or SAGF for 1, 2, and 7 days.
- Scanning electron microscopy (SEM) analyzed surface elements of RMGICs.
Main Results:
- RMGICs exhibited significantly higher fluoride release in distilled water compared to SAGF.
- Calcium fluoride (CaF2) formation at the interface explained the observed differences.
- The thickness of the CaF2 layer was influenced by initial formation speed and medium renewal.
Conclusions:
- Fluoride release from RMGICs is significantly affected by the surrounding medium's composition.
- CaF2 precipitation plays a key role in modulating fluoride release kinetics.
- The study proposes a pattern for CaF2 formation relevant to RMGIC performance.