The oscillating-rotating power brush provided statistically significantly superior reductions compared to the sonic brush in mean adjusted MGI ( 31 % and 29 % at Weeks 4 and 12 , respectively ; p < 0.001 ) , GBI ( 17 % at Week 12 ; p = 0.047 ) , and total number of bleeding sites ( 48 % and 30 % at Weeks 4 and 12 , respectively ; p = 0.002 ) , and produced statistically significantly greater relative mean adjusted plaque reductions for RMNPI whole mouth plaque ( 38 % and 24 % at Weeks 4 and 12 , respectively ; p < 0.001 ) , gingival margin plaque ( 36 % at Week 4 ; p = 0.004 ) , and interproximal plaque ( 39 % and 26 % at Weeks 4 and 12 , respectively ; p < 0.001 ) .