Table 1.

Bactericidal activity of tetracycline hydrochloride (%) in Fusobacterium nucleatum, Prevotella intermedia, and Porphyromonas gingivalis

Concentration tetracycline HCl (mg)	Exposure time to tetracycline HCl
	30 s						60 s						120 s
	F. nucleatum		P. intermedia		P. gingivalis		F. nucleatum		P. intermedia		P. gingivalis		F. nucleatum		P. intermedia		P. gingivalis
	pH 1.9	pH 7.0	pH 1.9	pH 7.0	pH 1.9	pH 7.0	pH 1,9	pH 7.0	pH 1.9	pH 7.0	pH 1.9	pH 7.0	pH 1.9	pH 7.0	pH 1.9	pH 7.0	pH 1.9	pH 7.0
125	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
250	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
500	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

Viability control: F. nucleatum 195×10⁶ SD: ±8.33. P. intermedia 118×10⁶ SD: ±21.63. P. gingivalis 2816×10⁶ SD: ±13,89. HCl - Hydrochloride; F. nucleatum - Fusobacterium nucleatum; P. intermedia - Prevotella intermedia; P. gingivalis - Porphyromonas gingivalis; pH - Potential of hydrogen; SD - Standard deviation