Liberação de fluor e aluminio e efeito anticariogenico de cimentos de ionomero de vidro : estudo "in situ"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Several studies in vitro and in vivo show that glass ionomer cements (GICs) are able to reduce secondary caries. Besides, some studies have been suggesting that GICs can present inhibitory effect on cariogenic microbiota. Such effect has been attributed to some components released from the material, like fluoride (F) and aluminum (AI). Thus, the purpose of this study was to analyze biochernically and microbiologically dental plaque formed on two GICs, as well as to evaluate the effects of F and AI release on the proportion of mutans streptococci and on the formation of secondary caries. For such, twelve volunteers participated in this crossover double-blind study, performed in 3 phases of 21 days. Human enamel blocks were restored with a conventional GIC (Ketac-fil) or with a resin modified GIC (Vitremer). In addition, a resin (Z-100) was used as negative control. Intra-oral palatal appliances, containing four enamel blocks restored with one of the materiais, were constructed for each volunteer. During the experimental period, the volunteers used fluoride-free dentifrice and dripped a 20% sucrose solution onto the dental blocks, eight times a day. At the end of each phase, the levels of F, AI, calcium (Ca), phosphorus (P), water-insoluble polysaccharide (WIP) and mutans streptococci proportion were assessed in dental plaque. In addition, the formation of secondary caries was evaluated quantitatively through the determination of microhardness in enamel around the restorations, and qualitatively by visual inspection. The results did not show significant differences for the concentrations of F, AI, WIP, Ca and P in the plaque, as well as for the proportion of mutans streptococci. On the other hand, significant differences were found for the microhardness analysis and for the visual evaluation, indicating that both GICs were able to reduce the mineral loss in the enamel around the restorations. We can conclude, therefore, that GICs inhibited the development of secondary decay, although - in the conditions of the present in situ study - such materiais have not induced changes in the biochemical and microbiological composition of dental plaque

ASSUNTO(S)

placas dentarias materiais dentarios caries dentarias - prevenção

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