Objectives: The purpose of this in vitro study was to evaluate microleakage and enamel shear bond strength of five dentin adhesive systems. Methods: For microleakege testing, Class V cavities were prepared on buccal and lingual surfaces of thirty human pre-molars, with occlusal margins in enamel and gingival margins in dentin/cementum. These preparations were restored with compomer (Dyract AP) following application of: Group1–37% phosphoric acid + Prime & Bond NT(control); Group2–Non-Rinse Conditioner + Prime & Bond NT; Group3–Prime & Bond NT(no etching); Group4–Clearfil SE Bond; and Group5–Adper Prompt L-Pop. After 24h storage at 37ºC in water, margins were finished with polishing discs and the surrounding tooth surfaces coated with nail varnish. The samples were immersed in a 50% solution of silver nitrate for 24h and a RX developing solution for 8h. The samples were cut, polished and the extent of microleakage was measured and ranked using a 0-3 scale. For enamel shear bond strength testing, fifty human molars were embedded in epoxy resin and ground flat to 600-800grit. The enamel surfaces were treated according to the five groups described above, and then compomer cylinders were built on the enamel surfaces. After 1 week in water at 37ºC, shear bond strengths were measured in EMIC machine at 0.5mm/min. Results: On the microleakage test, the mean ranks were: Gr.1=103.45; Gr.2=138.39; Gr.3=186.34; Gr.4=98.76; Gr.5=138.34. Kruskal Whalis test revealed significant difference among the groups. The mean shear bond strength values MPa±SD were: Gr.1=23.39±3.99; Gr.2=18.11±3.64; Gr.3=10.88±2.47; Gr.4=22.69±3.87; Gr.5=17.62±3.94. ANOVA revealed significant difference among the groups and Student Newman Keuls test (p<0.05) showed the statistical differences. Conclusions: The authors concluded that the Group 4 was similar to the control group and the Group 2, 3 and 5 presented results that were inferior to the control group, in both tests. Supported by FAPERJ-E-26/172.310/2000-APQ1

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