In situ anticariogenic effect of conventional glass ionomer cement by dentrifice dependence / Efeito anticariogênico de cimento de ionômero de vidro convencional pela dependência de dentrifício: estudo "in situ"

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

15/04/2011

RESUMO

The aim of this study was to assess in situ anticaries potential of conventional glass ionomer cement (GIC) to prevent enamel and dentine demineralization either alone or in combination with a fluoride (F) regimen. A randomized, blind, crossover design for caries induction was carried out in 2 phases of 14 days each. This study was a 2 x 2 cross-over factorial design as follows: (1) Material Treatment at 2 levels, dental slabs restored with glass ionomer cement (GI) and sound tooth slabs (ST); and (2) Dentifrice at 2 levels, F dentifrice (FD) and non-F dentifrice (NF). The effect of the factors on the response variables was evaluated: hardness loss area (?S) (quantitative assessment) and light polarized microscopy (qualitative), concerning enamel and dentine, individually. The experimental groups obtained from the association of those factors were assigned to the volunteers. In each experimental phase, volunteers used a palatal device loaded with two dental slabs from each treatment group, using FD or NF depending on the experimental phase. Volunteers (n=07) were considered experimental units for all variables being studied. Biofilm was allowed to accumulate on the slabs, and a high cariogenic challenge was provided by exposing the biofilm/slab sets to a 20 % sucrose solution 8 times/day extra-orally. After each experimental phase was evaluated the integrated area of hardness loss as a function of lesion depth (?S) in enamel and dentine by cross-sectional microhardness, and demineralization was observed by light polarized microscopy. After statistical analysis (ANOVA and Tukey test), for both dental substrates no significant interaction between the factors was found (p>0.05). Also, for enamel and dentin FD provided lower demineralization than NF (p<0.05). For material treatment, higher enamel demineralization was found for ST compared to GI (p<0.01), but no differences were found between GI and ST in dentin substrate (p>0.05). By PLM was observed that the largest percentage of apparent demineralization occurred in NF+ST group (64.28%) and GI+NF (50%), and lowest apparent demineralization percentage occurred in GI+FD (28.57%) followed by ST+FD (42.85%). In concluded, fluoride dentifrice showed lower demineralization areas, and anticaries effect of FD was proven under all conditions studied. And, the association of conventional glass ionomer cement with fluoride dentifrice led to a lower percentage of apparent demineralization lesions in images of polarized light microscopy. Independent of dentifrice, glass-ionomer restorations showed anticaries effect on enamel

ASSUNTO(S)

cárie dentária desmineralização flúor dental caries demineralization fluorine

ACESSO AO ARTIGO

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