Composição e cariogenicidade do biofilme dental formado in situ na presença de amido e sacarose

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Since in vitro and animal studies suggest that the combination of starch with sucrose is more cariogenic than sucrose alone, the objective of the present study was to evaluate in situ the effects of this association on the acidogenicity, biochemical and microbiological composition of dental biofilm, as well as on deciduous enamel demineralization. This study was blind and had a cross-over design, with two 14-day experimental phases. Fifteen volunteers wore intra-oral palatal appliances containing blocks of enamel, obtained from human deciduous teeth, which were submitted to 4 groups of treatments: (T1) water or negative control; (T2) 2% starch; (T3) 10% sucrose and (T4) 2% starch + 10% sucrose. Two different treatments (split-mouth) were evaluated in the same appliance and were randomized between T1/T3 or T2/T4 in the first phase, inverting the treatments in the second phase. The treatment solutions were dripped onto the dental blocks 8 times a day. The biofilm formed on the blocks was analyzed with regard to amylase activity, acidogenicity and biochemical and microbiological composition. Mineral loss was evaluated by cross-sectional microhardness. No significant difference was found between mineral loss of the dental blocks of control group and blocks treated with starch (P >0.05). The greatest mineral loss was observed for the association starch + sucrose (P <0.05). Also, this association resulted in the highest lactobacillus count in the biofilm formed (P <0.05). In conclusion, the results of the present study indicate that starch alone is not cariogenic for human deciduous enamel. The data also suggest that starch may increase the cariogenic potential of sucrose and this effect seems to be related to the selection of lactobacillus in the dental biofilm formed

ASSUNTO(S)

esmalte dentario caries dentarias dieta

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