Avaliação in situ de uma formulação de dentifricio com concentração reduzida de fluor

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

In the last decades there was a caries decline in most of the countries of the world, but at the same time the prevalence of dental fluorosis increased. Thus, the development of a dentifrice for children with low fluoride concentration would offer higher safety with regard to dental fluorosis, as long as it prove to be as efficient as a conventional one with 1000-1100 ppm F. The in vitro evaluation showed that the reactivity of a formulation containing 550 ppm F was improved, increasing the fluoride incorporation in dental enamel with action similar to a conventional dentifrice with 1100 ppm F. Preliminary results of this formulation, using palatal appliances, showed its efficiency on reducing enamel demineralization. Nevertheless, the dose/effect relationship was not evaluated, as well as a control such as a Gold Standard dentifrice was not used to demonstrate equivalence of effect. A 5 step double-blind crossover study was conducted with 15 adult volunteers wearing removable prosthesis, containing 4 bovine enamel blocks, 2 sound and 2 with subsuperficial caries lesions. The volunteers were submitted to the following treatments with dentifrices: 1= Non-fluoridated; II=275 ppm F; III=550 ppm F; IV= 1100 ppm F; V= Crest ("Gold Standard", 1100 ppm F). The dentifrices were silica-based and the formulations were modified (PH5,5) to improve the reactivity of fluoride (NaF) with dental enamel. Surface and cross sectional enamel microhardness (Knoop) were determined in the blocks. Enamel was also analyzed to evaluate fluoride uptake. The data showed that the formulation with 550 ppm F was more efficient than placebo and the one with 275 ppm F (p<0.05) and it was equivalent to the "gold standard"(p>0,05) in: 1) Reducing enamel demineralization on surface and in caries lesion; 2) Enhancing enamel remineralization on surface and in caries lesion; 3) Increasing fluoride in sound and carious enamel. The data suggest that the experimental formulation with lower fluoride concentration could have the same anticaries efficiency as the conventional and would be more safe with respect to dental fluorosis

ASSUNTO(S)

esmalte dentario caries dentarias dental fluorosis fluorose dentaria

ACESSO AO ARTIGO

Documentos Relacionados