Objective: The purpose of this study was to examine the tensile bond strength of one-step (Adper Prompt L-Pop (3M ESPE); AL, and two-step self-etching adhesive systems (Clearfil SE Bond (Kuraray); SE, and one-bottle priming adhesive system (Single Bond (3M ESPE); SB to enamel and dentine of extracted human premolars using an original Portable Adhesion Tester; PAT (Nara Y et al., J. Dent Res. 75, SI #2943, 1996 etc.). Methods: A standardized wedge shaped cavity was prepared in the cervical buccal side of the tooth. Dentine bond strength (DBS) test; was performed at the gingival dentine wall (n=8). Enamel bond strength (EBS) test; was performed at the beveled enamel (n=8). The test was performed immediately, after the system was applied to dentine or enamel, following manufacturer's direction, and combined with the original made composite resin (Kuraray) for PAT. The data were statistically analyzed using ANOVA, Tukey's q-Test and Weibull analysis. Results: Mean values (SD) of EBS/DBS in MPa were; AL; 28.92 (6.57) / 28.39 (4.23), SE; 21.64 (4.56) / 25.00 (4.59), SB; 26.47 (2.72) / 17.68 (3.64). [EBS ]; AL was statistically higher than SE (p<0.05). [DBS ]; SB was lower than SE(p<0.05) and AL(p<0.01). EBS was higher than DBS in SB (p<0.01). Weibull modulus against EBS/DBS were; AL; 4.75 / 7.10, SE; 4.18 / 5.29, SB; 10.27 / 4.94. There was statistical difference between SB and the other two materials at enamel (p<0.01). Conclusion: Although the EBS of each system showed equivalent in value, SB seemed to have better bonding quality, compare to the other systems. On the other hand, AL and SE DBS were higher than SB, however the quality of bonding were equivalent among the three systems.

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