Influence of surface sealant on the microleakage in teeth restored with composite / Influencia de selantes de superficie na microinfiltração de dentes restaurados com resina composta

AUTOR(ES)

Larissa Silveira de Mendonça Fragoso

DATA DE PUBLICAÇÃO

2005

RESUMO

The aim of this "in vitro" study was to evaluate the influence of sealants on the microleakage of teeth restored with composite. Class V cavity preparations were performed in 45 bovine incisive fragments. The cavities were filled with composite resin Z250. They were then stored in distilled water and placed in a incubator at 37°C for 24 hours followed by finishing and polishing. After this procedure, the samples were randomly divided into 3 groups: Group I (no sealant) - control; Group II- Samples were etched and the surface sealant Fortify (Bisco) was applied over the filling s surface; Group m- Samples were conditioned and Biscover (Bisco) was applied over the filling s surface. In a second moment, the fillings were stored once more in distilled water for 12 hours at 37°C and then were submitted to thermocyc1ing. To evaluate marginal infiltration, the samples were immersed in 2% methylene blue dye (pH 7,0), for 4 hours. The method used for evaluation was qualitative, through the manipulation of an Estereomicroscope where three observes analyzed the infiltration leveI of the pigment within the tooth/filling according the following scores: 0= no infiltration; 1= infiltration within tooth/material interface, beyond half of the gingival wall; 2 = infiltration within tooth/material interface, beyond half of the gingival wall, but not reaching the axial wall; 3 = infiltration within tooth/material interface up to or beyond axial wall. The results obtained were submitted to statistical analysis (Kruskal-Wallis Test). 1t was demonstrated that the surfaces sealantes Fortify (group II) and Biscover(group m) presented the lowest averages of marginal infiltration, and these results were statistically significant in relation to group control (group I). 1t can be conc1uded that the use of surface sealant was eficient on reducting the microinfiltration

ASSUNTO(S)

dentistica dentistry

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