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Revista de Odontologia da UNESP

versão On-line ISSN 1807-2577

Resumo

DIAS, Gisele Fernandes et al. The hardness and chemical changes in demineralized primary dentin treated by fluoride and glass ionomer cement. Rev. odontol. UNESP [online]. 2016, vol.45, n.1, pp.33-40.  Epub 26-Jan-2016. ISSN 1807-2577.  http://dx.doi.org/10.1590/1807-2577.08815.

Background

Fluoride plays an important role in the control of dental caries.

Aim

To evaluate the chemical exchange between restoration of glass ionomer cement of high viscosity (GIC) and primary dentin with application of sodium fluoride (NaF) 2% through changes in hardness from uptake of calcium, phosphate and fluoride.

Material and method

Class I cavities were prepared in 40 sound primary molars, and the sample was divided into two groups (n=20) according to dentin condition: sound (1) and demineralized (2). Sub-groups (n=10) were formed to investigate the isolated action of the GIC or the association with NaF (F). This in vitro study examined the chemical exchange under two conditions, sound and demineralized dentin (pH cycling), to simulate the occurrence of mineral loss for the caries lesion. G1 and G2 received GIC restoration only; groups G1F and G2F received NaF before GIC restoration. The specimens were prepared for Knoop hardness test and micro-Raman spectroscopy. A two-way ANOVA test (α = 0.05) was used for statistical analysis. Micro-Raman data were qualitatively described.

Result

Increased hardness was observed in all the sites of direct contact with GIC in sound and demineralized dentin for all groups (p<0.001); no difference was observed in microhardness after application of NaF (p>0.05). In the evaluation of micro-Raman, direct contact between GIC and dentin for sound and demineralized dentin resulted in increased peaks of phosphate.

Conclusion

The exchange between GIC and demineralized dentin may induce changes of mechanical properties of the substrate, and uptake of mineral ions (phosphate) occurs without the influence of NaF.

Palavras-chave : Glass ionomer cements; dentin; atraumatic restorative treatment; tooth decay; fluoride.

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