Treatment effects and periodontal status of chronic periodontitis after routine Er:YAG laser-assisted therapy

Table 3 Comparison of inflammatory factors in gingival crevicular fluid from the two groups (mean ± SD)

Groups	Cases	TNF-α in ng/mL	IL-6 in ng/mL	IL-8 in pg/mL
Before therapy
Study group	53	7.82 ± 3.43	11.67 ± 2.59	12.12 ± 3.19
Control group	53	9.06 ± 3.89	12.13 ± 2.97	10.99 ± 3.30
t		1.741	0.850	1.792
P value		0.085	0.397	0.076
After therapy
Study group	53	2.04 ± 0.89	4.60 ± 1.26	3.15 ± 1.08
Control group	53	3.11 ± 1.07	6.25 ± 1.41	4.64 ± 1.23
t		5.597	7.182	6.627
P value		0.000	0.000	0.000

IL: Interleukin; TNF-α: Tumor necrosis factor-α.