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KMID : 0370819920070010042
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Yonsei Journal Dental Science
1992 Volume.7 No. 1 p.42 ~ p.50
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THE INFLUENCE OF LACTIC ACID ON FORMATION OF ARTIFICIAL DENTAL CARIES IN ACID BUFFER SOLUTION
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Abstract
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The end product of the metabolism of the oral microorganism, organic acid, is an element that produces dental caries. Among organic acids produced by oral microorganism, lactic acid which takes the important role in producing dental caries was
chosen to
evaluate the effect of lactic acid concentration and demineralization time on producing artificial dental caries. The subjects, sound permanent teeth without any demineralization or crack, were immersed in acid buffer solution which has the
different
lactic acid concentration of 0.01M, 0.025M, 0.05M, 0.1M under pH 4.3 and degree of saturation 0.153±0.003 kept in constant and were operated to produce dental caries under different demineralization time(3, 6, 9 days). After the specimen was
made
100μm in thickness and imbibed in water, final conclusions were obtained by observing them under polarizing microscope.
1. As a result of observing specimen using polarizing microscope, subsurface lesion, the specific findings of incipient enamel caries, was observed and surface zone and sound enamel showed negative birefringence and body of lesion showed
positive
birefringence.
2. the depth of lesion produced in artificial dental caries was increased as the concentration of latic acid increased.
3. The depth of lesion produced in artificial dental caries was increased as the exposure time of enamel in demineralization solution increased.
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KEYWORD
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