Effects of fluoride and/or trace elements on enamel solubility.

Area of Science:

• Dental research
• Materials science
• Biomineralization

Background:

• Dental enamel solubility is a key factor in tooth decay.
• Fluoride treatment is a common method to strengthen enamel.
• The role of trace metal ions in modulating enamel's response to fluoride requires further investigation.

Purpose of the Study:

• To investigate the effects of various trace metal ions (aluminum, strontium, titanium, molybdenum, vanadium) on dental enamel solubility.
• To assess the impact of these metal ions, at two concentrations, on fluoride uptake by dental enamel.
• To determine the combined effect of specific metal ions and fluoride on enamel's resistance to dissolution.

Main Methods:

• Enamel blocks were treated with solutions of different metal salts followed by fluoride (4,000 ppm).
• Perchloric acid was used to etch successive layers of enamel.
• Fluoride content was measured using an ion-specific electrode, and calcium levels were determined by atomic absorption spectrophotometry.

Main Results:

• Combined application of aluminum and fluoride significantly reduced enamel solubility (p < 0.001).
• Strontium (0.01 M) combined with fluoride also significantly decreased enamel solubility (p < 0.01).
• Titanium (higher concentration), aluminum, and molybdenum pre-treatments increased fluoride uptake compared to fluoride alone, with titanium showing statistical significance.

Conclusions:

• Aluminum and strontium, in conjunction with fluoride, are effective in reducing dental enamel solubility.
• Certain trace metal ions, particularly titanium, can enhance fluoride uptake into enamel.
• These findings suggest potential for novel formulations combining metal ions and fluoride for improved dental caries prevention.