The Effects of Toothpastes Containing Theobromine and Hydroxyapatite on Enamel Microhardness after Immersion in Carbonated Drink

摘要

This study aimed to analyze and compare the effects of toothpastes containing theobromine and hydroxyapatite on enamel microhardness after immersion in a carbonated drink. The remineralizing abilities of both toothpastes were also evaluated and compared. The crowns of 21 maxillary first premolars were immersed in a carbonated drink for 10 min. The specimens were divided into three groups as follows: those brushed with toothpastes containing theobromine (n = 7) and hydroxyapatite (n = 7), and those brushed with aquadest (n = 7) for 9 min and 20 s each. The enamel hardness was measured after each treatment. A significant decrease in enamel hardness (average, 114 ± 12 KHN) was noted in all specimens after immersion in the carbonated drink. Kruskal–Wallis and Mann–Whitney tests revealed significant changes in hardness values after brushing with the theobromine- and hydroxyapatite-containing toothpastes. Enamel microhardness values were increased by 42 ± 9 KHN in the theobromine group and 55 ± 6 KHN in the hydroxyapatite group. Furthermore, enamel hardness in the theobromine group was significantly higher than that in the hydroxyapatite group (p 0.05).