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J Korean Acad Pediatr Dent. 2005;32(3): 454-460.
EFFECT OF CITRIC ACID AND CALCIUM ON DENTAL EROSION
In-Gyeong Song, Kwang-Hee Lee, Dae-Eup Kim,, Young-Sook Yang
Department of Pediatric Dentistry, College of Dentistry, Wonkwang University Wonkwang Dental Research Institute
Corresponding Author: Kwang-Hee Lee ,Tel: 063-850-1955????7, Email: kwhlee@wonkwang.ac.kr
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ABSTRACT
The purpose of study was to observe the effect of calcium and citric acid on the dental erosion of human premolar enamel. Enamel specimens were demineralized in 0.1%, 0.3%, 0.5%, or 1.0% citric acid solutions with 0.05%, 0.1%, or 0.2% calcium for 5, 15, 30, and 60 minutes, and then the surface microhardness of the enamel was measured. The hardness decreased as the concentration of citric acid and the demineralization time increased. Hardness after 5 minutes was 76~90% in case of no calcium and the inhibition of dental erosion by calcium addition was 2~15%. Hardness after 15 minutes was 65~84% in case of no calcium and the inhibition of dental erosion by calcium addition was 3~17%. Hardness after 30 minutes was 53~72% in case of no calcium and the inhibition of dental erosion by calcium addition was 6~22%. Hardness after 60 minutes was 43~66% in case of no calcium and the inhibition of dental erosion by calcium addition was 7~19%. The inhibition was the highest in 1.0% citric acid and 0.2% calcium. In 0.1% citric acid the inhibition increased as the demineralization time increased, but in 0.3% to 1.0% citric acid the inhibition was most high at 30 minutes and decreased a little at 60 minutes. These results suggest that calcium has a inhibitory effect on the citric acid induced dental erosion.
Keywords: Citric acid | Calcium | Dental erosion | Surface microhardness
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