“…The incline of the PI during the four consecutive days as well as the general value of the PI values was in accordance with published findings [1,2,11,16,18], as was the retardation of the plaque accumulation with CHX [1,2,4,11,16,18], although in these studies other PI values were used. Plaque accumulation on the teeth surfaces could be assessed even more precisely by knowing the percentage of Table 2 Mean (±SD) values of the plaque index (PI), the plaque area as a percentage (PA%) and the vitality of plaque (VF%) on day 4, and significant differences in comparison with the placebo solution (ns not significant; *P≤0.05, **P≤0.01, ***P≤0.001 [20] considered the different PI values to not be exact enough and used also the calculation of the relative PA for a more detailed analysis of plaque growth for a period of 96 h. For evaluation, a planimeter was used by these authors. The amount of plaque was given as a percentage of the total buccal surface just like performed in the present study.…”