Efeito de diferentes concentrações de fluor e diferentes niveis de desafio cariogenico no desenvolvimento de carie dental em ratos dessalivados

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

Dental caries is an infectious, transmissible, and multifactorial disease, that continues to affect the vast majority of people and the presence of carbohydrates, mainly sucrose, is an important factor in its ocurrence. Although, its incidence has been efficiently controlled in some segments of the population by the use of fluoride, a cariostatic agent. Nevertheless, the amount of fluoride required for optimum effect under a high caries risk condition has not been studied. Besides that, differences in the intensity of carious challenge, for whatever reasons, may play a role in determining the fluctuations in the effectiveness of F. The purpose of the study was to evaluate the effect of different concentrations of F on the development of dental caries and explore the cariostatic effect of F under various levels of cariogenic challenge. Thus, the following study was divided in 2 experiments. In experiment I, sixty desalivated Sprague-Dawley rats received Diet 2000 ad libitum for 21 days and the following to drink: group (1) sterile distilled water (SDW); (2) 10 ppm F SDW; (3) 20 ppm F SDW; (4) 30 ppm F SDW; (5) 40 ppm F SDW. In experiment II, eight groups of9 desalivated rats were placed in a Kõnig-Hõfer programmed feeder and were fed sucrose as follows: two groups received 3 meals daily, two groups 6 meals, two groups 12 meals and two groups 17 meals. One group trom each. pair received drinking water containing 10 ppm F and the other SDW. In experiment I, 20, 30 and 40 pprn F reduced caries .development significantly. Fluoride, at 10 ppm, reduced the severity ofthe carious lesions significantly. Considering all smooth surfaces, it seems that at 30 pprn, F reached a "plateau" protective effect. The percentage of S. sobrinus in the 40 ppm F group was significantly lower than the control group, showing that the antibacterial effect of F may have had a significative contribution to the caries reduction in this group. Using this model of high cariogenic challenge, the results suggest that elevated levels of F may be effective in patients at high caries risk. In experiment II, F reduced the incidence and severity of smooth-surface caries in alI groups, but the animaIs receiving 3 meals and F did not show significantly lower scores than the animals receiving 3 meals and SDW. The protective effect of F decreased as the number of meals increased. It is concluded that the effectiveness of F is influenced by the leveI of cariogenic challenge and that consideration should be given to adjusting leveI of F exposure based on caries risk

ASSUNTO(S)

sacarose fluoretos caries dentarias rato como animal de laboratorio

ACESSO AO ARTIGO

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