Abstract
This study evaluated by an in vitro model the effect of beverages on dental enamel previously subjected to erosive challenge with hydrochloric acid. The factor under study was the type of beverage, in five levels: Sprite® Zero Low-calorie Soda Lime (positive control), Parmalat® ultra high temperature (UHT) milk, Ades® Original soymilk, Leão® Ice Tea Zero ready-to-drink low-calorie peach-flavored black teaand Prata® natural mineral water (negative control). Seventy-five bovine enamel specimens were distributed among the five types of beverages (n=15), according to a randomized complete block design. For the formation of erosive wear lesions, the specimens were immersed in 10 mL aqueous solution of hydrochloric acid 0.01 M for 2 min. Subsequently, the specimens were immersed in 20 mL of the beverages for 1 min, twice daily for 2 days at room temperature. In between, the specimens were kept in 20 mL of artificial saliva at 37ºC. The response variable was the quantitative enamel microhardness. ANOVA and Tukey's test showed highly significant differences (p<0.00001) in the enamel exposed to hydrochloric acid and beverages. The soft drink caused a significantly higher decrease in microhardness compared with the other beverages. The black tea caused a significantly higher reduction in microhardness than the mineral water, UHT milk and soymilk, but lower than the soft drink. Among the analyzed beverages, the soft drink and the black tea caused the most deleterious effects on dental enamel microhardness.
Highlights
Dental erosion or erosive tooth wear is a multifactorial condition [1,2], characterized by the loss of hard tissue by chemical corrosion and dissolution by acids of non-bacterial origin [3]
The exposure of enamel to low-calorie black tea caused a reduction of microhardness, significantly higher than the exposure to mineral water, soymilk and ultra high temperature (UHT) milk, less than the one caused by soda lime
This study evaluated the effect of beverages on dental enamel submitted to erosive challenge with hydrochloric acid (HCl)
Summary
Dental erosion or erosive tooth wear is a multifactorial condition [1,2], characterized by the loss of hard tissue by chemical corrosion and dissolution by acids of non-bacterial origin [3]. The origin of these acids is either extrinsic (dietary and environmental) or intrinsic (gastrointestinal) [4]. Acid juices [3,6], soft drinks and carbonated beverages show erosive effects [7]. The chemical composition of a beverage is related to dental erosion [9] and contains citric acid, which is a strong chelator of tooth minerals and has been linked to the erosive effect of beverages [7,10]
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