Evaluation of enamel mineral loss around cavities prepared by ER,CR:YSGG laser and restored with different materials after an acid challenge / Avaliação da perda mineral do esmalte adjacente a cavidades preparadas com laser de Er, Cr:YSGG e restauradas com diferentes materiais após desafio ácido

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The aim of this study was to evaluate the enamel calcium loss around cavities prepared by Er,Cr:YSGG laser and restored with different materials after an acid challenge. One hundred and twenty enamel samples obtained from third molars (4 x 4 mm) were randomly divided in 12 groups (n=10) using different techniques: G1- high-speed drill (HD); G2- Er,Cr:YSGG laser (3W, 20Hz, 53.05 J/cm2)(air 65% - water 55%); G3- Er,Cr:YSGG laser (4 W, 20 Hz, 70.74 J/cm2); G4- Er,Cr:YSGG laser (5 W, 20 Hz, 88.43 J/cm2). Each experimental group was divided in subgroups, according to the restorative material: 1 - glass ionomer cement (GIC), 2 - resin modified GIC (RMGIC), 3 - adhesive system and composite resin (C). Samples were submitted to an acid challenge (4.8 pH) for 7 days. The Demineralizing solutions were analyzed in relation to the calcium ion contend (ppm/mm2), in different times (1, 3 and 7 days), under atomic emission spectrometry. ANOVA and LSD tests were performed (?=5%). There were significant difference between Technique and Restorative Material on Total Time. The lower average values of calcium loss were observed on G2 + GIC, G2 + RMGIC, G1 + RMGIC groups; the higher values were observed on G1 + C, G4 +GIC, G4 + C. The composite resin showed higher calcium loss than RMGIC and GIC. The lased cavities using lower fluence (53.05J/cm2) showed significant reduced demineralization than higher fluences (70.74 and 88.43J/cm2). Neither the techniques nor the restorative materials used were able to prevent the enamel demineralization. The findings of this in vitro study suggest that the Er,Cr:YSGG lased cavities (53.05J/cm2) restored with GIC or RMGIC or conventional drill cavities with RMGIC were effective on reducing the mineral loss and enhancing the enamel acid resistant around restorations after the acid challenge, showing an important potential in preventing secondary caries.

ASSUNTO(S)

materiais restauradores cimento de ionômero de vidro laser de er perda minera secondary caries lesions desmineralização er cr:ysgg laser esmalte espectrofotometria glass ionomer cement enamel spectrometry demineralization lesão de cárie secundária cr:ysgg mineral loss restorative materials

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