Tensile bond strength evaluation of er:yag laser irradiated bovine dentin associated to different treatments. scanning electron microscopy analisis / Avaliação da resistência à tração da dentina bovina irradiada com laser de Er:YAG combinada a diferentes tratamentos. Análise das superfícies pela microscopia eletrônica de varredura

AUTOR(ES)

Fábio Renato Pereira Robles

DATA DE PUBLICAÇÃO

2003

RESUMO

Under scientific improvements in dentistry towards the perfect cavity sealing and adhesion, the development of materials, techniques and the better understanding of dental substrate features, the Er:YAG laser (2,94 mm) technology plays a role as an efficient tool in dentin surface treatment, performed in low energy density, whether isolated or in association with acid etching. In order to obtain a more uniform mircro-retentive zone (hybrid layer, tags and microtags) and to avoid the critical aspects on adhesion such as the collagenous demineralized zone collapse, it has been proposed the removal of this collagenous zone with the sodium hypochlorite (NaOCl) protein depletion technique. The aim of the present study was to evaluate the interaction of these surface treatments in bovine dentin (conventional acid etching. Er:YAG laser and protein depletion), to measure the tensile bond strength of the treated dentin surfaces, by using an acetone-based adhesive system and to observe the dentin surfaces under scanning electron microscopy analysis (SEM). The results showed that Er:YAG laser performed in low energy density (19,29 J / cm2, at 60 mJ and 2 Hz) could positively influence in dentin tensile strength, as good as conventional acid etching. The laser / acid association in dentin treatment increased tensile bond strength whether had it been performed the NaOCl protein depletion or not. SEM observation of Er:YAG dentin treated surfaces followed by NaOCl had shown a morphologic micro-retentive pattern; however, its tensile bond strength values came out to be low.

ASSUNTO(S)

surface treatment of dentin dentin adhesion tratamento superficial da dentina laser Érbio adesão á dentina erbium laser

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