Effect of photodynamic therapy (PDT) on Enterococcus faecalis biofilm in experimental primary and secondary endodontic infections

Table 1 Reduction of E. faecalis after antimicrobial treatment

	Contamination with E. faecalis CFU/ml × 10⁶		Treatment		Contamination after treatment CFU/ml × 10⁶		Reduction of E. faecalis[%]	Culture negative samples [%]
	Mean	Std Dev	3% NaOCl	PDT	Mean	Std Dev	Reduction of E. faecalis[%]	Culture negative samples [%]
Primary infection	2.48	2.04	X	-	0.0006	0.0003	99.9^a	80
	2.22	1.92	-	X	0.16	0.14	92.7^b	5
	2.13	1.86	X	X	0.0004	0.0003	99.9^a	90
Secondary infection	2.24	1.76	X	-	0.0005	0.0001	99.9^a	55
	2.57	2.21	-	X	0.02	0.04	99.9^a	0
	2.26	1.58	X	X	0.001	0.001	99.9^a	30

Percentage of culture negative samples. Superscript letters indicate statistical differences.

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