Objective: To evaluate coronal leakage and apical material extrusion of 3 obturation techniques. Method and Materials: The coronal part of 60 freshly extracted human maxillary central incisors was removed, leaving roots 10 mm in length. After instrumentation by hand K-files and smear layer removal, the 60 roots were divided randomly into 3 groups. The roots of each group were obturated using different obturation techniques. The obturation techniques tested were cold lateral condensation, System B, and Thermafil. Leakage measurements were accomplished using fluid filtration methodology. Filling material extrusion was recorded using a yes or no statement. Results were subjected to statistical analysis using chi-square tests. Results: Fluid filtration results revealed no significant differences among the 3 techniques tested 48 hours after obturation (P > .05). Thermafil tended to extrude significantly more material beyond the apex (P .05). Conclusions: The 3 obturation techniques are equally effective at sealing the root canals. Thermafil's tendency for slight material extrusion should be considered when obturating canals with insufficient apical constriction. Schlagwörter: cold lateral condensation, leakage, obturation, System B, Thermafil