Microbial leakage of Gutta-Percha and Resilon root canal filling material: a comparative study using a new homogeneous assay for sequence detection.

The sealing ability of gutta-percha/sealer root canal filling was compared to a new thermoplastic synthetic polymer-based obturation material (Resilon), using a microleakage model and a new sequence detection assay One Cut Event AmplificatioN (OCEAN). Eighty-eight extracted human teeth, shaped with K-Files and the ProTaper Technique, were randomly assigned to four groups (n = 22) and obturated in the apical 5 mm. Group R were obturated with the Resilon/Epiphany technique; group GP were obturated with gutta-percha and Zinc oxide eugenoe sealer; group RCH and GPCH received calcium hydroxide intracanal medication before being obturated. Sterilized specimens were inoculated with Enterococcus faecalis and incubated in sterile medium for 47 days. DNA extracted from the specimens was amplified by PCR and then identified by the OCEAN technique. Samples obturated with Resilon root canal filling material showed a greater number of microleakage events than the other groups (p = 0.036). Calcium hydroxide medication did not have a relevant impact on the quality of the apical seal (p = 0.044).

Influence of thiamphenicol on the primary functions of human polymorphonuclear leucocytes against Streptococcus pyogenes.

Current antibiotic therapy encourages the use of antibiotics that may potentiate the host's immune defences. We therefore investigated the effect of thiamphenicol (TAP), the active principle of thiamphenicol glycinate acetylcysteinate (TGA), on human granulocyte functions, mainly phagocytosis and intracellular killing of Streptococcus pyogenes. Our findings support the use of thiamphenicol in the treatment of respiratory tract infections caused by S. pyogenes as it acts directly against the pathogen as well as in cooperation with PMNs by eliciting their intracellular killing.