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