Table 1.

Descriptive statistics of the clinical, planimetric and volumetric plaque indexes 4 days after the cessation of all mechanical and chemical oral hygiene practices

	Mean ± SD	Range (min–max)	p-value
TDP TMQHPlI	2.59 ± 0.93	1–5	< 0.001 2
DDP TMQHPlI	1.42 ± 0.87	0–3
PLANItot (%)	45.80 ± 18.21	4.03–96.33	< 0.001 1
PLANIdark (%)	24.25 ± 14.41	1.66–82.04
PLANIlight (%)	21.54 ± 13.21	0.77–63.72
PLANIvolmap (%)	18.57 ± 8.94	1.20–42.82
VPI (mm3)	0.90 ± 0.36	0.28–2.00	< 0.001 2
AVPI (mm3/mm2)	0.02 ± 0.01	0.01–0.03

PLANItot planimetric evaluation of all disclosed plaque per tooth-surface area, PLANIdark planimetric evaluation of dark/purple disclosed plaque per tooth-surface area, PLANIlight planimetric evaluation of light/pink disclosed plaque per tooth-surface area, PLANIvolmap planimetric evaluation of plaque per tooth-surface area based on binary (yes/no) volumetric colour map with cutoff 0.01 mm; VPI volumetric plaque index, AVPI adjusted volumetric plaque index, DDP TMQHPlI Turesky’s modification of Quigley Hein Plaque index for dark disclosed plaque; TDP TMQHPlI Turesky’s modification of Quigley Hein Plaque index for total disclosed plaque, SD standard deviation, min minimal value, max maximal value; bold: statistical significance at α = 0.05; ¹: Friedman test; ²: Wilcoxon signed rank test