Bacteriologic results from 4,000 root canal cultures

Abstract

The bacteriologic results from more than 4,000 root canal cultures are discussed. Streptococci form 61 per cent of the isolated organisms. Among these, the group of hemolytic, indifferent, and indifferent anaerobic streptococci, mainly belonging to serologic groups F, G, and C, seem the most serious possible pathogens. D streptococci (especially Streptococcus liquefaciens) are difficult to eliminate from the root canal and are also potential pathogens. Streptococcus mitis seems of much less importance, and all other organisms are to be considered as chance contaminants.