Leakage along warm gutta-percha fillings in the apical canals of curved roots

The aim of this study was to investigate the leakage along the apical porti on of warm gutta-percha obturated curved canals. Human mandibular premolars with single, curved (21 degrees-40 degrees) canals were prepared using the Lightspeed technique. Two groups of prepared canals, matched according to curvature and prevalence of apical transportation, were obturated by two te chniques. Coronal gutta-percha was removed immediately after root obturatio n was completed to simulate the procedure for post space preparation. Leaka ge along the apical 3 mm of root filling was measured with a fluid transpor t device. Vertical condensation of warm gutta-percha and Pulp Canal Sealer provided less leakage than Thermafil plastic obturators and AH26 sealer (P= 0.002).