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DIFFERENCE OF CALCIUM FLUORIDE FORMATION BETWEEN THE ENAMEL AND DENTIN AFTER FLUORIDE APPLICATION IN VITRO

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Abstract

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Áú±º¿¡¼­ ºÒ¼Ò³óµµ°¡ ÇÑÃþ Áõ°¡µÇ¾ú´Ù(P<0.05).
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#ÃÊ·Ï#
The purpose of this study was to compare the amount of calcium fluoride deposited
on the enamel and dentin surface and to obtain information on the morphological change
and crystallographic details of mineral deposition after 12,000ppm APF application in
vitro.
The bovine enamel and dentin blocks were randomly assigned to eight groups
according to artificial caries lesion formation and difference of fluoride application time.
The fluoride concentration and morphological characteristics on the treated enamel and
dentin surface were investigated by using fluoride quantitative analysis and SEM. The
powdered enamel and dentin of the intact bovine incisors were prepared for the X-ray
diffraction analysis.
The following results were obtained.
1. The amounts of KOH-soluble fluoride on the carious enamel and dentin surface
after 24th APF application were higher than after only 5min APF application (P<0.05),
but in the case of the sound enamel and dentin surface were similar after 5min and 24h
applies lion (P>0.05). The fluoride content was highly increased in the carious dentin as
com pared with sound dentin after APF application (P<0.05)
2. The carious enamel surface after APF application, the demineralized enamel surface
were recovered a more dense enamel surface and precipitation of crystal was observed a
distintive surface layer of spherical globules of about 1 m diameter. In the case of the
fluorided carious dentin surface, precipitation of calcium fluoride-like material was
deposited both inside the dentinal tubules as well as in the intertubular regions.
3. The crystallographic structure of powdered enamel and dentin after 24h APF
application had large crystallities of apatite and CaF2 diffraction peaks in the enamel as
compared with dentin. The diffraction data collected from the 27.50-29.50 (2) angular
range of the powdered enamel, the (105) apatite, (225) apatite and (111) CaF2 peaks of
the enamel crystallities were detected after 24h APF application.

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