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KMID : 0350519950480010323
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Journal of Catholic Medical College
1995 Volume.48 No. 1 p.323 ~ p.334
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The Remineralization of Softened Enamel and Etched Enamel Using Calcifying Solution or Fluoride Application
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Abstract
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In order to evaluate the remineralization of enamel surface, the indentation lengths of acid-etched enamel lesions(n=48) and softened enamel lesions(n=48) were investigated in this study both in vivo and in vitro. Samples of etched enamel were
treated
by 37% phosphoric acid for 30 seconds clinically, and artificial carics lesions were treated by acetic acid in Ph 5.5 for 3 hours. After demineralization, both samples were subjected in vitro to treatment with synthetic calcifying solutions(CaCl2
1.5
mmol/1, KH2PO4 1.22 mmol/1, F 1 ppm) in pH7 for 12 hours or fluoride gel in pH 4 for 1 hours or were exposed to saliva by means of an intraoral appliance for 12 hours in the influence of fluoride. Alterations in hardness of the enamel surface
were
measured by indentation techniques using Vickers hardness tester. Enamel surfaces of control and experimental groups were used to make scanning electron microscopic observations.
@ES The results were as follows :
@EN 1. Significant decrease in indentation length(increase in hardness) was observed for etched enamel group rather than softened enamel group treated with calcifying solutions in vitro. Also decrease in etched pit pattern with precipitation of
crystals
and loss of inter-rod space were observed in both softened and etched enamel samples in SEM.
2. Although significant decrease in indentation length was observed in etched enamel samples exposed to the influence of saliva, no evidence of such changes were observed in softened samples. In scanning electron microscopic observation, there
were no
definite changes but, etched enamel surface showed increase in crystals of inter-rod space.
3. Significant increase in increase in indentation length was observed in softened enamel samples treated with fluoride gel in vitro. But etched enamel did not show significant changes in indentation length. In scanning electron microscopic
observation, softened enamel surface was covered with layers of CaF2-like materials.
These results suggest that etched enamel surface treated with calcifying solutions in vitro and in vivo should be far more effective than softened enamel surface treated with the same ways.
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