THE EFFECT OF STREPTOCOCCUS ORALIS ON THE FORMATION OF ARTIFICIAL PLAQUE

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Journal of the Korean Academy of Pediatric Dentistry 1999;26(1):77-87.
Published online February 28, 1999.

THE EFFECT OF STREPTOCOCCUS ORALIS ON THE FORMATION OF ARTIFICIAL PLAQUE

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Streptococcus oralis의 인공치태 억제효과에 대한 연구

김선미¹, 양규호¹, 정성수², 오종석³

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

Abstract

This study was performed to evaluate the effect of Streptococcus oralis on the formation of artificial plaque and the replication of Streptococcus mutans. S. mutans was incubated alone and in the combination with S. oralis in the beaker with wires. The produced plaque weight and the viable cells of S. mutans were compared between those cultures. Various factors were studied about the effect on the formation of plaque and the replication of S. mutans. Followings are the results. 1. Lower amount of plaque was produced and fewer cells of S. mutans were replicated at the mixed culture of S. mmutans and S. oralis than S. mutans alone. 2. When 10 mM glucose was added, the plaque weight was increased in the culture of S. mutans alone. But in the mixed culture of S. mutans and S. oralis, the plaque weight was not increased when 10 mM of glucose was added. 3. When 10 mM fructose was added, the plaque weight was increased in the culture of S. mutans alone or combined S. mutans and S. oralis. 4. In the mixed culture of S. mutans and S. oralis with different concentration, the more S. oralis exist, the less plaque and the fewer viable cells of S. mutans were observed. 5. The plaque weight and the viable cells of S. mutans were more decreased in the mixed culture of S. mutans and S. oralis than S. mutans alone after 12 hours. 6. When Staphylococcus epidermidis consuming hydrogen peroxide was added to the mixed culture of S. mutans and S. oralis, the plaque weight and the viable cells of S. mutans were increased. These results indicate that S. oralis inhibited the formation of plaque and the replication of S. mutans, and this may result from the formation of hydrogen peroxide S. oralis.

Key Words: Dental caries, artificial plaque, H₂Osub>2, Streptococcus oralis, Streptococcus mutans