Fig. 2

The difference between virtual and clinical probing results for all tested sites. A The correlation and regression results of virtual and clinical measurements. B The exact difference in the probing depth between virtual and clinical measurements. N = 108. Green dotted lines: the levels of − 0.20 mm and 0.20 mm; yellow dash-dotted lines: the levels of − 0.50 mm and 0.50 mm; black dashed lines: the levels of − 0.60 mm and 0.60 mm. The box plot represents the 5th percentile, 25th percentile, median (50th percentile, solid red line), 75th percentile, 95th percentile, and mean (black cross), respectively