Distribution of fluoride across human primary enamel

Area of Science:

• Dental Research
• Biomineralization
• Fluoride Metabolism

Background:

• Fluoride is crucial for dental health, particularly in preventing caries.
• Understanding fluoride distribution in primary teeth is essential for optimizing its protective effects.
• Previous studies suggested an even fluoride plateau in enamel, which requires further investigation.

Purpose of the Study:

• To precisely map fluoride distribution within primary lower central incisors.
• To compare fluoride levels in prenatal and postnatal enamel.
• To investigate fluoride concentration at the neonatal line.

Main Methods:

• Analysis of fluoride concentration and distribution in 10 pairs of primary lower central incisors.
• Utilized an abrasive microsampling technique (Weatherell et al., 1985).
• Superimposed fluoride data onto optical micrographs of tooth sections.

Main Results:

• Fluoride concentration was highest on the enamel surface, decreasing towards the interior.
• Fluoride distribution did not form an even plateau in the enamel interior.
• Prenatal and postnatal enamel showed similar fluoride levels, except for the surface region.
• Fluoride concentration was notably low at the neonatal line.

Conclusions:

• The enamel surface is the primary reservoir for fluoride in primary teeth.
• Fluoride distribution is not uniform and varies significantly from the surface inward.
• Prenatal and postnatal enamel fluoride uptake is comparable, with the neonatal line representing a low-fluoride zone.