EFFECT OF CITRIC ACID AND CALCIUM ON DENTAL EROSION

Song, In-Gyeong; Lee, Kwang-Hee; Kim,, Dae-Eup; Yang, Young-Sook

Journal of the Korean Academy of Pediatric Dentistry 2005;32(3):454-460.
Published online August 31, 2005.

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

구연산과 칼슘이 치아침식증의 발생에 미치는 영향

송인경, 이광희, 김대업, 양영숙

원광대학교 치과대학 소아치과학교실∙치의학연구소

Correspondence: Kwang-Hee Lee, Tel: 063-850-1955????7, Email: kwhlee@wonkwang.ac.kr

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.

Key Words: Citric acid, Calcium, Dental erosion, Surface microhardness