Table 2. Accuracy of radiographic measurements with and without brightness and contrast adjustment of the distance between cemento-enamel junction/restoration margin and most apical extension of bony defect for all defects, as well for maxillary and mandibular defects separately, and amount of adjustments.

Intrasurgical (mm)	Radiographic without adjustment (mm)	Radiographic with adjustment (mm)	P-value
10.44 ± 2.67	9.38 ± 2.63	9.47 ± 2.72
Difference to intrasurgical	1.06 ± 1.81	0.97 ± 1.91	0.450
P	<0.001	0.001
Maxilla	1.05 ± 2.00	1.20 ± 2.00	0.341
Mandible	1.08 ± 1.62	0.72 ± 1.82	0.059
P	0.949	0.376
Adjustment	Mean/%	Increase/n	Decrease/n
Brightness	−1.30 ± 3.14	10	27
Contrast	3.78 ± 4.26	36	4