Table 3.

Comparison of the mean values of MMP-9 (± standard deviation) between groups and between examinations

Examination	A	PDT	Group versus group; p
I	172.26 ± 106.65	352.92 ± 73.72	0.35 NS
II	68.36 ± 66.88	199.55 ± 169.39	0.13 NS
III	58.2 ± 33.05	198.42 ± 107.64	0.80 NS
Timing	0.09 NS	0.17 NS

A—patients with aggressive periodontitis, who underwent SRP and antibiotic therapy

PDT-patients with aggressive periodontitis, who underwent SRP and PDT

I—baseline

II—3 months after treatment

III—6 months after treatment

NS not significant

*p < 0.05; statistically significant