Predominant cultivable microflora of human dental fissure plaque

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Abstract
Plaque developed in 10 occlusal fissures from unerupted 3rd molars during implantation for 200-270 days in lower molars of dental students. To characterize the predominant cultivable flora, 592 isolates (51 to 67 from each fissure) were subcultured from anaerobic roll tubes. Twenty-eight of the isolates were lost. Streptococci constituted 8-86% (median, 45%) of the isolates, Streptococcus mutans constituted 0-86% (median, 25%) and S. sanguis constituted 0-15% (median, 1%). A few isolates of S. mitior and S. milleri were found, but no S. salivarius. Staphylococci made up 0-23% (median, 9%). Gram-positive rods constituted 6-59% (median, 35%). Of these, 0-46% (median, 18%) were Actinomyces naeslundii and A. viscosus, but no anaerobic actinomyces were isolated. Arachnia and propionibacteria made up small proportions, lactobacilli were isolated from 2 fissures, constituting 10 and 29%, and eubacteria were isolated from 1 fissure (27%). Gram-negative cocci made up 0-46% (median, 4%). Only 2 isolates of gram-negative rods were found, both facultative anaerobes. Although 8 of the 10 fissures had large proportions of S. mutans, lactobacilli, or both, no caries was found even with microradiography. The large individual variation probably reflects differences in initial colonization from saliva and in growth conditions in each fissure.