• Journal of Periodontal and Implant Science
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• 제33권3호
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• pp.341-348
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• 2003

The purpose of this study was to determine the minimal inhibitory concentration (MIC) of cefuroxime axetil,　semisynthetic cefalosporin, for some putative periodotopathogens; F. nucleatum, A. actinomycetemcomitans P. intermedia and P. gingivalis. To investigate the efficacy of cefuroxime axetil, several antibiotics, amoxicillin, metronidazole, and ciprofoxacine, were used as control. The MIC was measured by Murray' s method. The MIC of cefuroxime axetil against some putative microbes, as a single use regimen, was relatively high in comparison with that of the other antibiotics used in this study. The MIC of cefuroxime axetil/metronidazole against some putative microbes, as a simultaneous regimen, was similar to that of the other antibiotics used in this study. The manimal level of cefuroxime concentration in gingival fluid was 9${\mu}$/ml at 36hr after the first dose. In conclusion, within the limited experiment, metronidazole/ cefuroxime axetil therapy of periodontitis may provide a therapeutic benefits in reducing the periodontopathogens.

• Journal of Periodontal and Implant Science
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• 제35권2호
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• pp.401-411
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• 2005

The aim of this study was to determine the minimal inhibitory concentration(MIC) of cefixime, which is a 3rd generation of cefalosporin, against 6 species of putative periodontopathogens; Fusobacterium nucleatum, Actinobacillus actinomycetemcomitans, Prevotella intermedia, Prevotella nigrescens, Tannerella forsythia and Porphyromonas gingivalis. The efficacy of cefixime was examined by comparing it with that of several antibiotics(amoxicillin, $Augmentin^{(R)}$ ciprofloxacin, metronidazole, and tetracycline), which were used as the control. The MIC was measured using a microdilution method. The MIC of cefixime against the putative periodotopathogens, as a single use regimen, was relatively lower than that of the other antibiotics. The MIC of cefixime/metronidazole against P. intermedia ChDC KB14, P. nigrescens ChDC KB50, F. nucleatum ChDC PV-F37, F. nucleatum ChDC F130, and F. nucleatum ChDC F175, as a simultaneous regimen, was lower than that of the other antibiotics. The concentration of cefixime in the crevicular fluid of volunteers who received 250mg every 12 hours for 3 days was $9{\mu}g/ml$ after 9 hours. In conclusion, cefixime showed good antimicrobial activity in a single treatment or as a combined therapy with amoxicillin, $Augmentin^{(R)}$ or metronidazole against 6 periodontopathogens.

• Archives of Pharmacal Research
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• 제19권2호
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• pp.143-147
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• 1996

LB20304 is a novel fluoroquinolone that exhibits a potent broad spectrum antibacterial activity against both gram-positve and gram-negative bacteria. The MICs (Minimal Inhibitory Concentration) of LB20304 were determined against both gram-positve and gram-negative bacteria under various conditions including several media, pHs, and inoculum concentrations. The in vitro activity of LB20304 was not significantly affected by the changes in testing conditions such as components of media and inoculum concentrations, but it was slightly reduced by acid condition. The MICs and MBCs (Minimal Bactericidal Concentration) of LB20304 against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were hardly affected by the presence of 50 % human serum, mouse serum, guinea pig serum or horse serum, and the MBCs were equal to or at most four-times higher than the MiCs. The activities of LB20304 were decreased by the presence of high concentraion of $Mg^{++}$ or human urine (pH, 5.5) in the test media. The frequencies of mutants resistant to LB20304 were similar to or lower than those found in ciprofloxacin and sparfloxacin.