LC and BF techniques resulted in fewer overfills than TF. Voids were absent in TF fillings, whilst small voids were found in the LC and BF groups.

S12 Results The mean time to reach working length was significantly shorter for Guttacore than Thermafil (p<0.05). There was significantly more debris remaining in the apical third compared to the coronal and middle thirds in all groups (p <0.05). Conclusions The Guttacore system requires less time than other sealing systems to reach the working length using Protaper files during the retreat. However, it was the group obturated with Calamus system which presented less obturation material remaining.