Methods: Fifty-five extracted human anterior single-root teeth were used. The coronal part of each tooth was removed and the root canals were prepared with NiTi rotary instruments. Teeth were divided into 5 study groups; Group I: MTA Fillapex; Group II: Sealapex and Group III: AH Plus (n=15) and two controls (n=5). The quality of root canal sealing was assessed by a fluid filtration method performed at 24 h and 180-day time intervals. Kruskal Wallis and Mann Whitney U tests were used to compare the groups.
Results: There were significant difference in fluid leakage among the groups at two time intervals (p<0.05). At first measurement, Group I presented less microleakage, statistically different than the Group II and Group III (p<0.05). No statistically significant difference in microleakage was observed between Group II and Group III (p>0.05).
After storage, Group II and Group III presented less microleakage, statistically different than the Group I (p<0.05). No statistically significant difference in microleakage was observed between Group II and Group III (p>0.05). In course of time no statistically significant difference in microleakage was observed in Group I, but significant decreases were observed in Group II and Group III (p<0.05).
Conclusions: Within the limitation of the study, MTA Fillapex has lowest improvement in sealing ability compared with Sealapex and AH Plus.