Table 1.

Sizes and morphologies of tested bacterial species.

Bacterial Species	Group	Gram	Size	Morphology
E. faecalis	1	Positive	0.6–2.5 µm	Cocci (spherical or ovoid)
P. gingivalis	1	Negative	0.5–5.0 µm in length	Bacillus
A. naeslundii	1	Positive	5–10 µm in length	Bacillus
F. nucleatum	2	Negative	5–50 µm in length, varied	Bacillus
A. actinomycetemcomitans	2	Negative	0.2–1 µm in diameter, varied	Coccobacillus
S. mutans	3	Positive	0.5–0.75 µm	Cocci (spherical)
S. sanguinis	3	Positive	0.5–0.75 µm	Cocci (spherical)
S. mitis	4	Positive	0.5–0.75 µm	Cocci (spherical)
S. sobrinus	4	Positive	0.5–0.75 µm	Cocci (spherical)