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Distributions of fluoride and magnesium in the human dentin were investigated. The undemineralized ground sections of permanent teeth (20-70 years old) were first microradiographed and then were subjected to line scan and quantitative point analyses with an electron microprobe.The layer of dentin may be divided into six zones according to mineralization pattern, namely: less mineralized outer mantle dentin (1), highly mineralized large calcoglobular zone (2), highly mineralized homogeneous zone (3), highly mineralized small calcoglobule zone (4), less mineralized “darkzone”(5), and highly mineralized pulpal “light zone”(6).Fluoride showed almost even distribution in zones 1-4. However, on entering zone 5, it beganto increase its concentration gradually towards the pulp and showed the highest concentration on thepulpal side of zone 6. Fluoride concentration tended to increase secondarily with age in zones 4-6, especially on the pulpal side of zone 6. In the secondary dentin, it was as low as observed in zones1-3. It seems that fluoride concentration is not related to the mineralization pattern and is probablyrelated to the formation rate.Magnesium concentration increased from zone 1 toward zone 5 in a slow gradient. However, enteringzone 6, it began to decrease in a very steep gradient. In the denticle and foci of calcareous degeneration, fluoride was very high and magnesium very low, as was observed in zone 6.

Distributions of fluoride and magnesium in the human dentin as revealed by electron microprobe