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The aim of this studdy was to evaluate the microleakage of composed resin and resin modified glass ionomer cement restorations of bovine teeth before the following variables: high speed turbine and Er:YAG laser. For this purpose 60 bovine teeth were selected. Half of the specimens (n=30) were perpared with high speed turbine and the other half (n=30) with Er:YAG laser From the prepared teeth with high speed turbine, half of these sample (n=15) were restored with composed resin and the remaining restored with resin modified glass ionomer cement both in agreement with the manufacturer’s instructions. The same procedure was accomplished for the teeth that were prepared of Er:YAG with laser. The teeth were submitted to the methodology of marginal microleakage, with aqueous solution of silver Nitrate. Each tooth was split up in the bucal-lingual sense. The cutted parts were agglutinated in glass sheet and properly identified, for evaluation and mensurement of the degree of marginal microleakage in Karl Zeissestereomicroscopy coupled to the the Image Tool 3.0 program. The results showed that independently of the material, teeth prepared with Er:YAG laser presented smaller values for marginal microleakage, being these values estatisticaly significant.

Preparos cavitários com laser de Er:YAG ou alta rotação: estudo comparativo do selamento de restaurações diretas