The objective: of this study was to compare the micro Tensile Bond Strength (µTBS) of two different prisms orientation with two different dentin adhesives. Materials and Method: 27 human third molar were sectioned to expose axial and tangentially the prisms. They formed four groups, the axial orientation formed groups A and B, the tangentially orientation formed groups C and D. The adhesive procedures were carry out with Adper TM Prompt (3M ESPE) in groups A and C. And One Coat Bond TM (Coltene) in groups B and D, using two layers in both adhesive. Over all adhesives, were applied Composite FiltekTM Supreme ( 3M ESPE). The specimens were mounted in acrylic mold and sectioned to obtain stick of 0,0252 cm. They remained 24 hours at 37 celcius degree under saline solution. The sticks were attached to a Geraldeli device and fractured using a Instrom Universal Testing Machine, at a crosshead of 0,1cm/min. Mean µTBS expressed in Mpa and standard deviation (±SD) are show in table below. FisherLs was the comparison test Result: Group A: 47.89(± 58.61); Group B 31.52 (± 23.71); Group C 10.83 (± 9.28); Group D 8.56 (± 8.94) . Conclusions: The highest µTBS in enamel was obtained axially in groups A and B compared with tangentially to enamel prisms ( p<0,001). The results of group A was statistical significant compared to B group (p<0,05) This project was supported by 3M ESPE.

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