Journal of the Korean Academy of Pediatric Dentistry 2006;33(3):469-481.
Published online August 31, 2006.
The effect of acidic drinks on the surface of tooth-colored restorative materials
Seok-Yun Bang, Eun-Jung Kim, Hyun-Jung Kim, Soon-Hyeun Nam, Young-Jin Kim
산성음료가 치아색 수복재의 표면에 미치는 영향
방석윤, 김은정, 김현정, 남순현, 김영진
경북대학교 치과대학 소아치과학교실
Correspondence:  Young-Jin Kim, 
Among the etiologic factors of enamel corrosion, daily intake has been considered with a profound interest, especially the intake of acidic drinks. It is thought that the rapid consumption of acidic drinks will not only results in the affection to the teeth but also to the surface of the tooth-colored restorative materials. Therefore, the puopose of this study is to examine the alterations occurred in the surface of the tooth-colored materials according to the exposed time, with 3 most common acidic drinks in contact with daily life. Resin-modified glass-ionomer, polyacid-modified composite resin, composite resin were immersed on 0.9% NaCl, Coke, orange juice, sports beverages as 4 groups in each. The surface hardness and the surface roughness of specimens were measured with following methods: before immersion, 1 day after immersion, 1-,2-,3-,4- weeks after immersion. Results were as follows. 1. Tooth-colored restorative materials, with the exception of composite resin, showed statistically significant changes in surface hardness and roughness when immersed on acidic drinks(p<0.05). 2. The degree of change in surface hardness and roughness occurred as follows, in order of severity from greatest to least resin-modified glass-ionomer, polyacid-modified composite resin, composite resin 3. Sports beverages resulted in greater alterations to surfaces than Coke and orange juice. 4. In the SEM image of the groups immersed in acidic drinks, resin-modified glass-ionomer and polyacid-modified composite resin showed loss of filer. Severe cracks were observed, especially on the resin-modified glass-ionomer.
Key Words: Acid drinks, Tooth-colored restorative materials, Surface hardness, Surface roughness, Exposed time

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