Liberação de flúor de restaurações de ionômero de vidro e a sua incorporação ao esmalte dental após ciclos de desmineralização/remineralização
Abstract
O objetivo deste trabalho foi quantificar a liberação de flúor de materiais ionoméricos e a incorporação deste ao esmalte dental quando as restaurações são submetidas a ciclos de desmineralização/remineralização. Cavidades classe I foram confeccionadas na superfície oclusal de pré-molares humanos. Os dentes foram completamente cobertos com cera, exceto a cavidade oclusal e uma área de 3 mm2 na superfície vestibular. As cavidades foram restauradas com ChemFil II (G1), Chelon-Fil (G2), Chelon-Silver (G3) e amálgama (G4). Os dentes restaurados foram submetidos a 15 ciclos de desmineralização e 15 de remineralização. A concentração de flúor nas soluções foi quantificada ao final de cada ciclo e o flúor incorporado ao esmalte foi avaliado ao final da ciclagem. Os resultados mostraram que uma maior liberação de flúor ocorreu durante os primeiros ciclos e quando a solução desmineralizante foi utilizada. A incorporação de flúor ao esmalte ocorreu até 20-30 μm da superfície. As camadas mais superficiais do esmalte apresentaram uma maior concentração de flúor. O ionômero de vidro ChemFil II mostrou a maior liberação de flúor, o que também resultou em uma maior incorporação deste pelo esmalte.
UNITERMOS: cimentos de ionômeros de vidro; flúor; desmineralização; remineralização dentária; cárie dentária.
SUMMARY
The aim of this study was to quantify the fluoride release of ionomeric materials and its enamel incorporation when restorations were submitted to demineralization/remineralization cycles. Class I cavities were confectioned on occlusal surface of human pre-molars. The teeth were completely coated with wax, except for the occlusal cavity and 3 mm2 of the buccal surface. The cavities were restored with ChemFil II (G1), Chelon-Fil (G2), Chelon-Silver (G3) and amalgam (G4). The restored teeth were submitted to 15 desmineralization and 15 remineralization cycles. The fluoride solution concentration was quantified after each cycle and the enamel fluoride incorporation was evaluated after all cycles. The results demonstrated that the highest fluoride release occurred during the first cycles and when the desmineralizing solution was used. The enamel fluoride incorporation occurred whitin 20-30 μm of the surfaces. The superficial layers of the enamel presented the highest fluoride concentration. Chemfill II glass ionomer revealed the highest fluoride release and also resulted also in the highest fluoride enamel incorporation.
UNITERMS: glass ionomer cements; fluoride; demineralization; tooth remineralization; dental caries.
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