[Environmental factors in oral cavity effect on growing of Streptococcus sanguis and Strepococcus mutans-Oxygen of effects]
Oral Streptococcus species belong to facultative aerobes,and are easily inhibited by metabolic products of oxygen.Our study uses continues culture technique through adding oxygen in order to observe growing states of S.sanguis 34 and S.mutans Ingbritt(c) The result is that the resistance to oxygen of S.sanguis 34 is stronger than S.mutans Ingbritt(c).This result is in accordance with the phenomenon that S.sanguis is a pioneer colonizing germ of dental plaque.The lower resistance to oxygen of S.mutans indicates that the growth and cariogenic action of S.mutans are dependent on the internal circumstance of plaque.
Xiang
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Department Of Endodontics, Ninth People's Hospital School of Stomatology, Shanghai Second Medical University.Shanghai 200011,China.
Liu
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Li
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Wang
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