• Title, Summary, Keyword: S.mutans

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Relationship between Streptococcus mutans levels and dental caries experience (치아우식경험과 Streptococcus mutans의 관련성)

  • Kim, Seol-Hee;Seo, Dong-Won
    • Journal of Korean society of Dental Hygiene
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    • v.12 no.6
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    • pp.1158-1164
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    • 2012
  • Objectives : The aim of the present study was to measure the level of Streptococcus mutans(S. mutans), the major causative agent in dental caries, and to examine the relationship between S. mutans level and dental caries experience. Methods : The present study was carried out in 41 university students. S.mutans plaque was detected in the saliva using Dentocult$^{(R)}$-SM and was measured in absorbance. The data were analyzed in the relevance for number of dental caries experience. Results : The group of S. mutans value has progressive caries, which was higher than that of non-suffering caries(p<0.05). More caries experience showed higher value of S. mutans(p>0.05). According to the relationship with DMFT, level of S. mutans and absorbance, correlation with the level of salivary S. mutans is shown statistically highly significant (p<0.01). The level of S. mutans in saliva and plaque and absorbance is statistically significant(p<0.05). Conclusions : The levels of S. mutans in both group of high caries experience and progressive caries was highly detected, continuous oral health management should be carried out to prevent the possible dental caries.

ANTIBIOTIC SUSCEPTIBILITY IN MUTANS STREPTOCOCCI AND STREPTOCOCCUS ANGINOSUS ISOLATED FROM DENTAL PLAQUE (치면세균막에서 분리한 뮤탄스 연쇄상구균 및 Streptococcus anginosus의 수종 항생제에 대한 감수성 조사)

  • Kook, Joong-Ki;Lim, Sang-Soo;Yoo, So-Young;Hwang, Ho-Keel
    • Restorative Dentistry and Endodontics
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    • v.29 no.5
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    • pp.462-469
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    • 2004
  • The aim of this study was to investigate the susceptibility of mutans streptococci (S. mutans and S. sobrinus) and Streptococcus anginosus, for seven antibiotics, penicillin G, amoxicillin, ciprofloxacin, cefuroxime, erythromycin, bacitracin, and vancomycin. The minimum inhibitory concentration (MIC) of seven antibiotics against 3 species (type strains) of mutans streptococci and S. anginosus, 10 strains (wild type) of S. mutans, 7 strains (wild type) of S. sobrinus, and 11 strains (wild type) of S. anginosus, were measured by broth dilution method. All of the type strains of mutans streptococci and S. anginosus had the same susceptibility for penicillin G, amoxicillin, cefuroxime and bacitracin. Type strain of S. anginosus was sensitive in ciprofloxacin, but those of mutans streptococci were not. All of the clinical isolates of mutans streptococci and S. anginosus had the same susceptibility for the seven antibiotics. Our data reveal that mutans streptococci and S. anginosus have similar antibiotic-resistant character. In addition. these results may offer the basic data to verify the antibiotic-resistant mechanism of mutans streptococci and S. anginosus.

THE EFFECT OF STREPTOCOCCUS ORALIS ON THE FORMATION OF ARTIFICIAL PLAQUE (Streptococcus oralis의 인공치태 억제효과에 대한 연구)

  • Kim, Seon-Mi;Yang, Kyu-Ho;Chung, Sung-Su;Oh, Jong-Suk
    • THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.26 no.1
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    • pp.77-87
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    • 1999
  • 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.

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Effect of specific serum IgG antibody against Streptococcus mutans on the adherence of S. mutans to smooth surface in vitro (특이혈청항체(特異血淸抗體) IgG분획(分劃)이 Streptococcus mutans의 평활면(平滑面) 부착(附着)에 미치는 영향(影響)에 관(關)한 연구(硏究))

  • Lee, Jean-Yong;Choi, Eu-Gene;Ha, Youn-Mun;Kim, Chan-Soo
    • The Journal of the Korean Society for Microbiology
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    • v.17 no.1
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    • pp.75-85
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    • 1982
  • In order to demonstrate the effect of specific serum IgG antibody on the adherence of Streptococcus mutans to smooth surface and the mechanism of effective adherence inhibition by IgG antibody, in the present study authors obtained purified IgG from different immunogen preparations of S. mutans NCTC 10449(serotype c) and observed the effect of each IgG preparation on the adherence of each S. mutans strain cultured in different conditions. In addition, the present study was undertaken to observe the cross-reactivity of IgG and the effect of sucrose concentration on the adherence of S. mutans in vitro non-growth condition. The adherence of S. mutans to glass surface was effectively inhibited by serum IgG antibody. At the same IgG concentrations, anti-2% fructose grown/1N NaCl washed S. mutans NCTC 10449 cell showed greater adherence inhibitory effect to S. mutans strains than anti-2% sucrose grown and anti-S. mutans NCTC 10449 cell wall, and the greater inhibitory effects of IgG preparations were observed in assay using 2% fructose grown S. mutans cell preparations than using 0.1% sucrose grown cell preparations. These results suggest that the more effective adherence inhibition by serum IgG antibody is due to the reaction with S. mutans cell surface antigens rather than glucan and cell-associated glucosyltransferase. The greatest adherence inhibitory effect of IgG to S. mutans strains was observed on homologous NCTC 10449 strain and the inhibition cross-reactivities were observed between serotype c, e, and f strains. More pronounced cross-reactivity of adherence inhibition of IgG to S. mutans was observed in assay using anti-2% fructose grown/1N NaCl washed cell than using other IgG preparations, and observed in assay using 2% fructose grown S. mutans cell preparations than 0.1% sucrose grown cell preparations. It was interested that low, but adequate concentration of reactive IgG antibody significantly increased the adherence ability of S. mutans. This result may be due to the formation of small cell aggregates resulted in a increase in the numbers of organisms which adhered to glass surface. The adherence of S. mutans to glass surface was possible in the absence of glucan-synthetic activity. Low level of sucrose significantly increased the adherence ability of S. mutans to glass surface, but excessive amount of sucrose induced large cell aggregates resulted in a decrease in the numbers of organism which adhered.

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Nested PCR for the Detection of Streptococcus mutans (Nested PCR를 이용한 Streptococcus mutans의 검출)

  • Choi, Min-Ho;Yoo, So-Young;Lim, Chae-Kwang;Kang, Dong-Wan;Kook, Joong-Ki
    • Korean Journal of Microbiology
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    • v.42 no.1
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    • pp.19-25
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    • 2006
  • This study was undertaken to develop PCR primers for the identification and detection of Streptococcus mutans (by)using species-specific forward and universal reverse primers. These primers targeted the variable regions of the 16S ribosomal RNA coding gene (rDNA). The primer specificity was tested against 11S. mutans strains and 10 different species (22 strains) of oral bacteria. The primer sensitivity was determined by testing serial dilutions of the purified genomic DNA of S. mutans ATCC $25175^T$. The data showed that species-specific amplicons were obtained from all the S. mutans strains tested, which was not observed in the other species. The direct and nested PCR could detect as little as 2 pg and 2 fg of the chromosomal DNA from S. mutans ATCC $25175^T$, respectively. This shows that the PCR primers are highly sensitive and applicable to the detection and identification of S. mutans.

IDENTIFICATION OF THE AG I/II AND GTFD GENES FROM STREPTOCOCCUS MUTANS GS-5 (연쇄상구균 GS-5의 ag I/II와 gtfD 유전자 클로닝)

  • Jeong, Jin-Woo;Baik, Byeong-Ju;Yang, Yeon-Mi;Seo, Jeong-Ah;Kim, Jae-Gon
    • THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.32 no.2
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    • pp.357-369
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    • 2005
  • Streptococci are Gram-positive, facultative anaerobes and have no catalase activities. Among mutans streptococci containing ${\alpha}-type$ hemolytic activity, S. mutans is a causative agent for dental caries. As well as acid production yielding the demineralization of tooth enamel, adherence and colonization of S. mutans to the teeth are also important for its virulence. These early colonization are accomplished by the bacterial fibrillar protein, Antigen I/II (Ag I/II) and glucosyltransferase (GTF). Therefore, Ag I/II and GTF are reasonable targets for the development of vaccine against S. mutans GS-5. The ag I/II and gtfD genes from S. mutans GS-5 were cloned and sequenced. Sequence analyses showed the nucleotides sequence of cloned genes had high homology to the sequences previously reported. The sequence alignment of 280 nucleotides between the cloned Ag I/II and the available sequence of the corresponding S. mutans GS-5 showed the perfect match. Comparing with the sequence of gtfD from S. mutans UA159, the corresponding nucleotide sequence of S. mutans GS-5 showed some mismatches and the mismatches introduced changes in four residues out of 105 amino acids, yielding four missense mutations.

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THE EFFECT OF LEUCONOSTOC LACTIS 51 AGAINST THE PLAQUE FORMATION OF STREPTOCOCCUS MUTANS (Streptococcus mutans의 치태형성에 대한 Leuconostoc lactis 51의 영향)

  • Kim, Tae-Geun;Yang, Kyu-Ho;Oh, Jong-Suk
    • THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.27 no.4
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    • pp.549-557
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    • 2000
  • Dental caries is a bacterial disease of the dental hard tisssus, characterized by a localized, progressive, molecular disintegration of tooth structure. The action of Leuconostoc lactis 51 about plaque formation and replication by Streptococcus mutans was studied as follows. 1. Lower amount of plaque was produced at the mixed culture of S. mutans and L. lactis 51 than S. mutans alone on the wires in the beaker. 2. Fewer cells of S. mutans were replicated at the mixed culture of S. mutans and L. lactis 51 than S. mutans alone. 3. In M17Y broth, viable cells of S. mutans and L. lactis 51 increased for 12 hours, and decreased for 24 hours. In M17YS broth, viable cells of S. mutans showed time-dependent decrease at mixed culture of S. mutans and L. lactis 51. 4. The culture supernatant of L. lactis 51 didn't inhibit the replication of S. mutans and the formation of artificial plaque. 5. Sucrose and frutose were extracted from the culture supernatant of L. lactis 51 in M17YS broth. These results suggest that L. lactis 51 isolated from the oral cavity inhibits the replication of S. mutans and the formation of artificial plaque.

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Effects of Dianthus Superbus on Activity of Streptococcus Mutans (구맥 추출물의 Streptococcus mutans 활성 억제 효능)

  • Yu, Hyeon-Hee;Kim, Dong-Kyu;Kim, Jin-Kook;You, Yong-Ouk
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.24 no.5
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    • pp.854-858
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    • 2010
  • Streptococcus mutans (S. mutans) plays an important role in the information of dental plaque and it is being noticed as major causative bacteria of dental caries. In the present study, inhibitory effects of the ethanol extract of Dianthus superbus Linne (D. superbus) on the growth, acid production, adhesion and water-insoluble glucan synthesis of S. mutans were examined. The ethanol extract of D. superbus (0.5 - 4 mg/ml) significantly lowered the growth of S. mutans in a dose dependent manner. The acid production of S. mutans were inhibited by the presence of ethanol extract of D. superbus(1 - 4 mg/ml) significantly. The ethanol extract of D. superbus (0.25 - 4 mg/ml) also significantly lowered the adherence of S. mutans in a dose dependent manner. In water-insoluble glucan synthesis assay, 0.25 - 4 mg/ml of the ethanol extract of D. superbus significantly inhibited the formation of water-insoluble glucan. These results suggest that D. superbus may inhibit the caries-inducing properties of S. mutans. Further studies are necessary to clarify the active constituents of D. superbus responsible for such biomolecular activities.

Streptococcus mutans Strains Isolated in Korea Can Hardly Metabolize Exogenous Nitric Oxide

  • Lee, Hwa Jeong;Bang, Iel Soo
    • International Journal of Oral Biology
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    • v.40 no.4
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    • pp.217-221
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    • 2015
  • Cariogenic Streptococcus mutans encounters a variety of host defense factors produced in oral cavity. Nitric oxide (NO) and NO-mediated reactive nitrogen species are potential antimicrobials of innate immunity that can threaten the fitness of S. mutans in their ecological niches. Streptococcal strategies to detoxify cytotoxic NO, which allow S. mutans to persist in caries or other environments of the oral cavity, remain unknown. In this study, we directly measured NO consumption rates of S. mutans isolated in Korea. Surprisingly, all S. mutans strains were unable to consume exogenous NO efficiently, while an intracellular parasite Salmonella enterica serovar Typhimurium expressing the NO-metabolizing enzyme flavohemoglobin consumed most of the NO. This result suggested that S. mutans has alternative detoxification systems for tolerating NO-induced nitrosative stresses.

Antimicrobial Activity of Coptis chinensis and Sophora flavescens against Streptococcus mutans ATCC 25175 (Streptococcus mutans ATCC 25175에 대한 황련과 고삼의 항균활성)

  • Eum, Jin-Seong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.2
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    • pp.384-389
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    • 2012
  • As part of our screening of anticariogenic agents from medicinal plants, the ethanol extracts of 25 herbs widely used in the fork medicine were tested for the antimicrobial activity against a cariogenic bacterium Streptococcus mutans ATCC 25175. The ethanol extracts of Coptis chinensis, Sophora flavescens, Glycyrrhiza uralensis, Mentha arvensis, and Saururus chinensis showed antimicrobial activities against S. mutans. The extracts of Coptis chinensis and Sophora flavescens among these medicinal plants showed significant antomicrobial activity against S. mutans. These results suggested that the extracts of Coptis chinensis and Sophora flavescens could be the potential source of antimicrobial agent against S. mutans ATCC 25175.