Table 1.

Comparison of mean PI score before and after treatment for each of brushes.

Mean ±SD	Before treatment	After treatment	T	P value
pulsar	1.55 ± 0.51	0.66 ± 0.44	7.6	<0.001
CrossAction	1.63 ± 0.44	0.55 ± 0.6	4.9	<0.001
Butler	0.92 ± 0.59	0.39 ± 0.44	4.9	<0.001