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Single-dose Concentrations of Tinidazole in Gingival Crevicular Fluid, Serum, and Gingival Tissue in Adults with Periodontitis

Periodontics Unit, Westmead Hospital Dental Clinical School, Westmead, NSW 2145, Australia

G. Mack

Paediatric Pharmacology Unit, Westmead Hospital

P. Tseng

Periodontics Unit, Westmead Hospital Dental Clinical School, Westmead, NSW 2145, Australia

M. Cvejic

Paediatric Pharmacology Unit, Westmead Hospital

M. Hayden

Paediatric Pharmacology Unit, Westmead Hospital

N. Buchanan

Paediatric Pharmacology Unit, Westmead Hospital

Previous studies have shown that metronidazole is effective in the treatment of subgingival microflora associated with destructive periodontitis. The aim of this study was to determine whether tinidazole, a close analogue of metronidazole, would reach sufficient concentrations in serum, gingival crevicular fluid, and gingival tissue, to inhibit putative periodontopathic bacteria.

Ten adult patients with moderate to advanced periodontitis took a single 2-g dose of tinidazole orally. Samples were assayed by high-performance liquid chromatography. The concentrations of tinidazole in serum and GCF were in a similar range (3.2-46.5 µg/mL). Tinidazole was not detected in the GCF in three of the patients. The drug was found in gingival tissue obtained at two h (0.17 ± 0.14 µg/mg) and six h (0.15 ± 0.18 µg/mg) after oral administration. The mean concentration of tinidazole in serum at 24 h (13 ± 3.0 µg/mL) is greater than the minimum inhibitory concentration for anaerobic bacteria as reported by others. The present data suggest that a single 2-g oral dose of tinidazole may lead to the presence of potentially bactericidal levels of tinidazole for up to 24 h in the periodontal pockets of some patients with periodontitis.

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Journal of Dental Research, Vol. 70, No. 5, 910-912 (1991)
DOI: 10.1177/00220345910700050901


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