Avaliação de tecnicas para inserção da resina composta e da utilização de um composito de baixa viscosidade na resistencia de união a parede gengival de cavidades classe II

AUTOR(ES)

Andre Figueiredo Reis

DATA DE PUBLICAÇÃO

2003

RESUMO

The aim of this study was to evaluate the effects of different filling techniques, cavity configuration and use of a low-viscosity composite liner on bond strength to the dentin of Class II cavities gingival floor; analyze the failure modes of fractured specimens; and observe the site available for bonding with a Scanning Electron Microscope (SEM). Standardized Class II cavities were prepared in the mesial surfaces of freshly extracted third molars, which were randomly assigned to ten experimental groups. All prepared surfaces were acid-etched, bonded with Single Bond adhesive system and restored with TPH composite, according to each technique: G1 and G2 - horizontal layering, G3 and G4 - faciolingual layering, G5 and G6 - oblique layering, G7 and G8 - bulk filling, G9 and G10 – control (flat dentin surfaces). For each technique, groups were tested, with or without a lowviscosity composite liner (Tetric Flow Chroma). After storage in water for 24 hours at 37oC, teeth were vertically serially sectioned to yield a series of 0.8 mm thick slabs. Each slab was trimmed into an hourglass shape of approximately 0.8 mm2 area at the gingival resin-dentin interface. Specimens were tested in tension at 0.5 mm/min until failure. Fractured specimens were analyzed in an SEM to determine the failure modes. No significant difference was found between groups restored with or without a low-viscosity composite liner (p>0.05). Among filling techniques, the bulk filling groups presented the lowest bond strength values (p<0.05), while incremental filling groups did not differ from control (flat dentin surfaces). Failure modes varied significantly among groups restored with and without the lowviscosity composite liner.

ASSUNTO(S)

dentistica adesivos dentarios materiais dentarios

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