Statistical analysis
pre-minus, tooth
PLAQUE
On a proband level, RMNPI values were calculated as the total number of tooth areas with plaque present divided by the total number of tooth areas scored, and median and range are given. The amounts of plaque reduction (pre-minus post-plaque scores) were calculated and mean reduction in the whole mouth, as well as interdental and marginal plaque scores, was compared between the two tooth brushing procedures by Wilcoxon’s signed-rank test. If not stated otherwise, median and range are given. The significance level was set at 