RELATIONSHIP OF THE BACTERIA INHIBITING PLAQUE FORMATION AND THE NUMBER OF ORAL BACTERIA

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Journal of the Korean Academy of Pediatric Dentistry 1999;26(3):459-465.
Published online August 31, 1999.

RELATIONSHIP OF THE BACTERIA INHIBITING PLAQUE FORMATION AND THE NUMBER OF ORAL BACTERIA

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치태형성 억제세균과 구강내 세균수와의 관계

양규호¹, 정현주², 오종석³

¹전남대학교 치과대학 소아치과학교실
²전남대학교 치과대학 치주과학교실
³전남대학교 의과대학 미생물학교실

Abstract

The inhibition degree of the isolated bacteria on plaque formation of Streptococcus mutans, and the effect of these bacterial genus on the concentration of total bacteria in saliva were assessed with the following. The effectiveness of the isolated bacteria on the inhibition of plaque formation was assessed culturing Streptococcus mutans in the beaker with orthodontic wires. The mean weight of plaque produced on a wire was 152mg in the culture of Streptococcus mutans only, whereas being reduced to 4mg, 78mg, or 72mg in the combined culture of Streptococcus mutans and Enterococcus durans, Lactobacillus acidophilus, or Streptococcus oralis. The colony forming units (CFU) of Streptococcus mutans were 3.6×10⁸ per ml in the culture of Streptococcus mutans, only, wheras being 1.4×10⁶, 5.6×10⁶ or 3.8×10⁶ per ml in the combined culture of Streptococcus mutans and Enterococcus durans, Lactobacillus acidophilus, or Streptococcus oralis. When saliva from children was inoculated on brain heart infusion agar, the colony forming units of bacteria were 4.8×10⁶ to 1.3×10⁹ per ml of saliva. The concentration of Enterococcus, Lactobacillus, or Streptococcus inhibiting Streptococcus mutans in saliva was not proportioned to that of total bacteria replicated on brain heart infusion agar. These results indicate that the isolated bacteria inhibited the replication of Streptococcus mutans, resulting into inhibiting the formation of plaque, but the concentration of Enterococcus, Lactobacillus, or Streptococcus inhibiting Streptococcus mutans, in saliva might not affect the total bacterial concentration of saliva.

Key Words: Plaque, Streptococcus mutans