Comparison of Cariogenic Characteristics between Fluoride-sensitive and Fluoride-resistant Streptococcus mutans

Seung-Hwan Ong (옹승환); Jong-Soo Kim (김종수); Dong-Heon Baek (백동헌); Seunghoon Yoo (유승훈)

doi:10.5933/JKAPD.2020.47.4.397

Comparison of Cariogenic Characteristics between Fluoride-sensitive and Fluoride-resistant Streptococcus mutans

Journal of the Korean academy of pediatric dentistry
Abbr : J Korean Acad Pediatr Dent
2020, 47(4), pp.397-405
DOI : 10.5933/JKAPD.2020.47.4.397
Publisher : The Korean Academy Of Pediatric Dentistry
Research Area : Medicine and Pharmacy > Dentistry
Received : May 25, 2020
Accepted : June 30, 2020
Published : November 30, 2020

Seung-Hwan Ong ¹, Jong-Soo Kim ², Dong-Heon Baek ², Seunghoon Yoo ²

¹단국대학교 치과대학
²단국대학교

Accredited

ABSTRACT

The aim of this study is to compare cariogenic characteristics of fluoride-sensitive Streptococcus mutans [fluoridesensitive (FS) S. mutans ] and fluoride-resistant Streptococcus mutans [fluoride-resistant (FR) S. mutans] in the presence of sucrose, and to evaluate its effect on cariogenic biofilm formation. S. mutans ATCC 25175 was continuously cultured in trypticase soy broth (TSB) containing NaF (70 ppm) for 40 days to generate FR S. mutans . FS and FR S. mutans were inoculated in TSB with or without 2% sucrose, and optical density and pH were measured every hour. An oral biofilm was formed using saliva bacteria and analyzed through confocal laser scanning microscopy and CFU count. Finally, the expression of glucosyltransferases genes of both S. mutans was investigated through RT-PCR. FR S. mutans exhibited slower growth and lower acidogenicity in the presence of sucrose compared to FS S. mutans . Both cariogenic and single species biofilm formation was lower in the presence of FR S. mutans , along with reduced number of bacteria. FR S. mutans showed significantly low levels of gtfB, gtfC, and gtfD expression compared to FS S. mutans . On the basis of results, FR S. mutans may be less virulent in the induction of dental caries.

KEYWORDS

Streptococcus mutans, Fluoride, Fluoride-resistance, Biofilm, Dental caries

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Journal of the Korean academy of pediatric dentistry 2023 KCI Impact Factor : 0.48

Comparison of Cariogenic Characteristics between Fluoride-sensitive and Fluoride-resistant Streptococcus mutans

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* References for papers published after 2023 are currently being built.

Journal of the Korean academy of pediatric dentistry 2023 KCI Impact Factor : 0.48

Comparison of Cariogenic Characteristics between Fluoride-sensitive and Fluoride-resistant Streptococcus mutans

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