1994 Volume 32 Issue 1 Pages 110-119
Fluoride concentrations and acid solubilities at 4 different sites (mesio-buccal, disto-buccal mesio-palatal, and disto-palatal), which are assumed to be developing at the same period, and 4 different layers (0.8-20 um) of the enamel surfaces in the twenty healthy upper first molars in situ were compared with biopsy materials using the micro-sampling and determination technique. These volunteers tested were men with an average age of 24 yr, and the molars were presumed to have 18-20 yrs of exposure time after eruption to the oral environment.
The results were as follows.
1) The results of the oral examinations of twenty subjects showed DMF=9.77%, DMFS=23.30%, PI=19.50%.
2) Fluoride concentrations of parotid saliva were 0.008±0.002 ppm.
3) The buccal side of the fluoride concentrations was higher than the palatal side in each depth, and distal sites were heigher than mesial sites at the same sides.
4) In the deeper layer, fluoride concentrations of in situ were higher than in the extracted teeth.
5) There was a tendency to a reversed relationship between the fluoride concentration and acid solubility both of the extracted teeth and in situ.
6) Mean Ca/P (W/W %) values ranged from 1.89-1.96 invariably, showed a tendency to be lower than that of the extracted teeth.
