공초점레이저주사현미경을 이용한 일부 시판음료에 의한 정상법랑질의 치아부식도 평가

Objectives.The purpose of this study was to evaluate the effect of dental erosion by some commercial beverages on sound enamel of bovine teeth using confocal laser scanning microscopy (CLSM). Methods.Three experimental groups (mixed beverage, carbonated flavored, and fruit juice) and one control group (natural mineral water) were established for this study. Each group consisted of 11 specimens obtained from bovine teeth. The concentration, pH level, fluoride, Ca and P of beverages were measured. Specimens were immersed in artificial saliva, except beverage treatment for day 8, and surface microhardness and lesion depth were measured. Results.The pH level of the four beverages was in the range of 2.39∼7.60. The concentration levels of fluoride, Ca and P were in the range of 0.03∼0.16 ppm, 1.67∼9.07 mg per 100 gm, and 0∼3.73 mg per 100 gm, respectively. The differences in surface microhardness (VHN) before and after the 8 day treatment were significant among the four groups for sound enamel. Lesion depths after the 8 day treatment on sound enamel by CLSM decreased significantly in of the following order: mixed beverage, carbonated flavored, fruit juice and natural mineral water (p＜0.01). Lesion depths by CLSM correlated with surface microhardness using the surface hardness test on sound enamel (r=−0.920). Conclusions.In this study, beverages with rich Ca and low pH showed lower VHN and lesion depth. Thus, we propose that low pH beverages with rich Ca may reduce the extent of dental erosion on sound enamel.