Table 4. Results of clinical periodontal examinations at baseline and at four weeks and six weeks in the control (n=42) and test (n=40) groups.

Periodontal examinations	Observation periods			P-valuea)
	Baseline	4 wk	6 wk
PI
Test group	0.50±0.55	0.37±0.48	0.35±0.57
Change from baseline		-0.13±0.49	-0.15±0.54	0.69
Control group	0.54±0.62	0.25±0.38b)	0.32±0.46b)
Change from baseline		-0.29±0.54	-0.22±0.61
GI
Test group	0.63±0.75	0.26±0.43b)	0.22±0.40b)
Change from baseline		-0.36±0.71	-0.40±0.74	0.19
Control group	0.59±0.63	0.45±0.61b)	0.34±0.53b)
Change from baseline		-0.14±0.43	-0.25±0.62
mSBI
Test group	0.29±0.50	0.04±0.15b)	0.04±0.17b)
Change from baseline		-0.25±0.51c)	-0.25±0.48c)	0.02
Control group	0.24±0.46	0.23±0.50	0.19±0.46
Change from baseline		-0.01±0.37	-0.05±0.39
GR
Test group	1.21±0.87	1.24±0.84	1.25±0.85
Change from baseline		0.02±0.32	0.04±0.39	0.05
Control group	0.92±0.78	0.88±0.71	0.88±0.69
Change from baseline		-0.04±0.33	-0.04±0.18
PD
Test group	1.46±0.48	1.40±0.46	1.30±0.54
Change from baseline		-0.05±0.32	-0.15±0.50	0.15
Control group	1.61±0.53	1.47±0.53b)	1.50±0.46
Change from baseline		-0.14±0.32	-0.11±0.46

Values are presented as mean±standard deviation.

n, number of patients; PI, plaque index; GI, gingival index; mSBI, modified gingival sulcular bleeding index; GR, gingival recession; PD, probing depth.

^a) P-value using the Friedman test.

^b)Statistically significant difference from baseline in each group (Wilcoxon signed-rank test, P<0.05).

^c)Statistically significant difference in change from baseline compared to the control group (Wilcoxon rank-sum test, P<0.05).