Tooth discoloration in endodontic procedures

We have conducted an experimental study in which dentine disks and Whatman paper were used to test discoloring effects of disinfectants, antibiotics, and flushing solutions used in endodontics. Each of the chemicals was tested alone and in the presence of a 1 per cent suspension of human erythrocytes in saline solution. Polyantibiotic and disinfectant pastes were used as dressings on recently extracted teeth, which were then split open to show discoloration. The most severe discoloring action was exhibited by the two N2 pastes and by polyantibiotic pastes containing Terramycin and Declomycin.