Microbial Analysis of Endodontic Infections in Root-filled Teeth with Apical Periodontitis before and after Irrigation Using Pyrosequencing

A high interindividual diversity was observed in both S1 and S2 samples, with no difference between the two irrigation groups. F. nucleatum ss. vincentii and some Streptococcus species were the most prevalent species in pre-preparation and post-preparation samples during retreatment of root-filled teeth with infection.