Relationship between Cariogenic Bacteria and pH of Dental Plaque at Margin of Fixed Prostheses

Table 1

Classification of oral environmental factors.

Oral environmental factors	Level
	0	1	2	3
mutans streptococci (CFU/ml)	<1×10^5		1×10^5∼1×10^6	>1×10^6
lactobacilli (CFU/ml)	≦1×10^3	1×10^4	1×10^5	≧1×10^6

CFU: colony forming units.