Fig 1.
Flow chart of study procedures.
Fig 2.
Illustration of scan alignment using the example of an upper jaw; lower jaw scans were processed accordingly.
Fig 3.
Procedure of planimetric evaluation on a 3D-intraoral-scan and an intraoral-camera image.
A, B and C show the procedure for a 3D-intraoral-scan. A: the 3D-intraoral-scan itself, B: image of the tooth of interest from a 3D-intraoral-scan, C: Visualisation of the plaque amount by converting all pixels below a certain threshold value for red by the programme on a cropped tooth on a black background. D and E shows the procedure for an intraoral-camera image. D: intraoral-camera image itself, E: Visualisation of the plaque amount by converting all pixels below a certain threshold value for red by the programme on a cropped tooth on a black background.
Fig 4.
Bland-Altman plots evaluating the agreement between the plaque amounts obtained from images of the 3D-intraoral-scan with the plaque amounts obtained from images of the intraoral-camera; P%S and P%C after logarithmic transformation.
A: upper right molar, B: lower left molar. The solid line indicates the mean difference of the methods of comparison; the broken lines indicate the 95% limits of agreement (mean±1.96xsd).
Fig 5.
P%S values at T1 (baseline), T2 (after 48 h abstaining from oral hygiene) and T3 (after tooth brushing) are shown for the oral and vestibular surfaces of the Ramfjord teeth.
Boxplots showing the minimum value, first quartile, median, third quartile, and maximum value. Circles indicate outliers (values more than 1.5⋅IQR above the upper quartile (Q3) or below the lower quartile (Q1)), asterisks indicate extreme values (values more than 2.5⋅IQR above the upper quartile (Q3) or below the lower quartile (Q1)).
Table 1.
Overall and site-specific P%S values (median (95% confidence interval/min;max)) obtained from images from the 3D-intraoral-scan at T1 (baseline), T2 (after 72 h without oral hygiene) and T3 (after toothbrushing).
Fig 6.
The difference between an intraoral-camera image and the image of a 3D-intraoral-scan of tooth 16 is shown here.
While in the intraoral-camera image the proximal surfaces remain hidden in the central image due to the convexity of the tooth, the tooth appears flattened on the image of the 3D-intraoral-scan and the proximal surfaces are more visible. A-C: Intraoral-camera images: A: mesial view, B: central view, C: distal view. D: an image from the 3D-intraoral-scan with a central view.