[Evaluation of the in vitro cariogenic potential of Streptococcus mutans (serotype C) strains isolated from caries-free and -active people: the ability of acidogenicity].
OBJECTIVE
To investigate the ability of acidogenicity of S. mutans (serotype C) strains isolated from the people with different caries experience.


METHODS
Same density solutions of all isolated S. mutans were made and cultured in different pH TPPE liquid for the same period of time. Terminal pH of the solutions was measured. The values of delta pH were compared.


RESULTS
Significant difference of acidogenicity was observed between the strains of different genotypes isolated from the same person. The ratio of high acidogenicity isolates harbored in caries-active people was greater than that of caries-free people; a significant difference was noted (P<0.05).


CONCLUSIONS
The high cariogenicity of isolated S. mutans strains of caries-active people shows a close relationship with the high acidogenicity of the isolated S. mutans (serotype C) strains.
Department of Endodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
Xiao-jing
XJ
Huang
Tian-jia
TJ
Liu
Zhi-yu
ZY
Cai
Zhou
Z
Chen
Jin-bo
JB
Yang
Jian-guo
JG
Liu
D000143:Acids / Q000032:analysis*; D003731:Dental Caries / Q000382:microbiology*; D003732:Dental Caries Activity Tests; D003733:Dental Caries Susceptibility; D005838:Genotype; D006801:Humans; D006863:Hydrogen-Ion Concentration; D012703:Serotyping; D013295:Streptococcus mutans / Q000145:classification / Q000235:genetics / Q000378:metabolism*
D000143:Acids