Dental cosmos . a, a portion of a putrid pulp mixed with subli-mate; b, the same with iodoform; c, the same without any antiseptic. Note the extensiveaction of the sublimate. The dark zones about a are due to a precipitate caused by the subli-mate. In the root-canal, however, these two factors are wanting, and it ispossible, therefore, that even the very slight antiseptic action whichiodoform in connection with putrid matter appears to exert on purecultures of bacteria outside of the human body may not develop inthe canals of the roots of teeth. 3. The antiseptic action of iodoform in connecti
Dental cosmos . a, a portion of a putrid pulp mixed with subli-mate; b, the same with iodoform; c, the same without any antiseptic. Note the extensiveaction of the sublimate. The dark zones about a are due to a precipitate caused by the subli-mate. In the root-canal, however, these two factors are wanting, and it ispossible, therefore, that even the very slight antiseptic action whichiodoform in connection with putrid matter appears to exert on purecultures of bacteria outside of the human body may not develop inthe canals of the roots of teeth. 3. The antiseptic action of iodoform in connection with putrid matterin the animal body was tested in the following manner : A purulent or putrid pulp was cut into small pieces, and half ofthem incorporated with iodoform. These pieces, both those with andthose without iodoform, were placed in skin-pockets at the root of thetails of white mice. After two to three days I took them out again,together with any pus which might be present, rubbed them up in Fig. * Deutsche med. Wochenschrift, 1882, S. 278. 94 THE DENTAL COSMOS. melted agar, which was then poured in the customary manner, andplaced in the incubator. I obtained the following results : Number of colonies whichdeveloped from thecontents of the pockets. 1 Diir ia> wltn iodoform 3400 1 c \ b, without 3600 2 pair \b, without 6470 - oair I a> with 472500 1 \b, without innumerable • f a, with 45 4P \b, without innumerable -r J a, with innumerable 5 D< \b, without innumerable a, with innumerable b, without innumerable 6 pair ( a, with 11700 7 Pair \^ without .. innumerable In most of the cases we see a considerable difference in the numberof colonies in favor of those where iodoform was used,—a fact which,as we shall see below, is to be explained not so much by any anti-septic action of the iodoform or the iodin, as, according to my opin-ion, by the circumstance that in the pockets treated with iodoform thebacteria had much less .nourishment, and consequentl
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