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

Table 2 Comparison of periodontal status in the two groups (mean ± SD)

Group	Cases	PD in mm	CAL in mm	SBI	GI	PLI
Before therapy
Study group	53	5.28 ± 1.08	4.81 ± 0.79	3.37 ± 0.59	1.38 ± 0.40	2.05 ± 0.65
Control group	53	5.51 ± 1.14	5.09 ± 0.83	3.51 ± 0.62	1.41 ± 0.37	1.98 ± 0.70
t		1.344	1.779	1.280	0.401	0.533
P value		0.182	0.078	0.204	0.689	0.595
After therapy
Study group	53	2.97 ± 0.38	2.71 ± 0.64	2.07 ± 0.32	0.51 ± 0.11	1.29 ± 0.34
Control group	53	3.71 ± 0.42	3.60 ± 0.71	2.80 ± 0.44	0.78 ± 0.23	1.70 ± 0.51
t		9.512	6.778	9.768	7.710	4.605
P value		0.000	0.000	0.000	0.000	0.000

CAL: Clinical attachment loss; GI: Gingival index; PD: periodontal probing depth; PLI: Dental plaque index; SBI: Sulcular bleeding index;.