Influence of Fluoride Dentifrice on Brushing Abrasion of Eroded Human Enamel: An in situ/ex vivo Study

Abstract

This in situ/ex vivo study assessed the effect of fluoride dentifrice on eroded enamel subjected to brushing abrasion. In a crossover study performed in 2 phases, 10 volunteers wore acrylic palatal appliances, each containing 3 human enamel blocks. Dentifrice was used to brush the volunteers’ teeth and the specimens subjected to abrasion. In phases A and B the dentifrices used had the same formulation, except for the absence or presence of fluoride, respectively. The blocks were subjected to erosion by immersion of the appliances in a cola drink for 5 min, 4 times a day. Then the blocks were brushed, and the appliance was replaced into the mouth. Enamel alterations were determined using profilometry and percentage change in surface microhardness (%SMHC) tests. The data were tested using the paired t test. The mean wear values (±SD, µm) were: group A 6.84 ± 1.72 and group B 5.38 ± 1.21 (p = 0.04). The mean %SMHC values (±SD) were: group A 54.6 ± 16.2 and group B 45.7 ± 6.8 (p = 0.04). Fluoride dentifrice had a protective effect on eroded enamel subjected to brushing abrasion.

Physical-chemical characteristics of whitening toothpaste and evaluation of its effects on enamel roughness

“…[3][4][5][10][11][12] Fluoride's ability to form a protective film on the enamel surface has been established. 1,7,9,14 However, the presence of fluoride in the bleaching gels did not increase mineral recovery. 20 Similarly, in the present study, the application of fluoride gel for one minute after the bleaching agent did not add a protective effect.…”

“…2-3, 8,14 However, the application of bleaching agents followed by brushing with abrasive toothpastes has not been extensively evaluated. 3,7,[17][18] The desiccation loss test showed different values among the groups, indicating toothpastes with different compositions. G1 (Sorriso Dentes Brancos  ) presented the lowest loss by desiccation and the highest values of ash content (solid residues).…”

Dental erosion and severe tooth decay related to soft drinks: a case report and literature review

“…Remineralizing toothpaste is more effective in intact and decalcified enamel (Muñoz et al, 1999;Magalhães et al, 2007). It could improve tooth-surface smoothness and gloss with regular use (Muñoz et al, 2004).…”

Use of dentifrices to prevent erosive tooth wear: harmful or helpful?

“…44 However, the incorporation of new hydroxyapatite into demineralized enamel is 30% reduction in wear when compared with a placebo). 26,27 Based on these findings, highly concentrated fluoride dentifrices (5000 ppm F, NaF) have been tested, but the results obtained so far are inconclusive. In an in situ study, a commercial dentifrice with 5000 ppm F had the same positive effect as another commercial 1100 ppm F dentifrice (NaF) on eroded and eroded-abraded dentin.…”