Group differences with respect to objectively achieved oral cleanliness – dental plaque after brushing (research Hypothesis b)
PLAQUE, PLAQUE
Plaque levels after brushing are shown in Fig. 
Mean and standard error of the means of plaque assessed after brushing by the Marginal Plaque Index (MPI) overall and with respect to plaque at outer, inner, cervical and proximal sections (left panel); percentage of TQHI scores 3–5 referring to rather coronal aspects of the teeth (right panel). *p < 0.05