Fluoride release and uptake by various dental materials after fluoride application

Area of Science:

• Dental Materials Science
• Biomaterials
• Fluoride Chemistry

Background:

• Fluoride-releasing dental materials are used to prevent caries.
• Understanding fluoride release kinetics is crucial for material selection and efficacy.
• Topical fluoride applications can influence the ion release profile of restorative materials.

Purpose of the Study:

• To quantify fluoride ion release from various dental materials.
• To assess the impact of daily topical fluoride applications on fluoride release.
• To compare the fluoride release patterns of glass-ionomers, giomers, and resin composites.

Main Methods:

• Six dental materials were tested: conventional glass-ionomer (F2), resin-modified glass-ionomer (LC), two giomers (RP, BT), fluoride-containing resin composite (UF), and non-fluoride resin composite (AP).
• Fluoride release was measured over 21 days in deionized water.
• Materials were then subjected to daily topical fluoride applications for 14 days, followed by a 7-day immersion period, with fluoride release measured throughout.

Main Results:

• Initially, significant differences in fluoride release were observed between material types.
• All materials showed a decrease in fluoride release after the topical fluoride immersion period.
• Conventional glass-ionomers and resin-modified glass-ionomers exhibited sustained fluoride release, while giomers showed reduced release post-treatment. The non-fluoride composite released no detectable fluoride.

Conclusions:

• Fluoride release from dental materials is material-dependent and influenced by topical fluoride applications.
• Conventional glass-ionomers and resin-modified glass-ionomers demonstrate a capacity for sustained fluoride release.
• Giomers and resin composites show varying responses to topical fluoride, impacting their long-term anticariogenic potential.