Table 4. Accuracy of radiographic measurements with and without brightness and contrast adjustment of the infrabony 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
5.65 ± 2.72	6.06 ± 2.76	6.22 ± 2.81
Difference to intrasurgical	−0.41 ± 2.40	−0.57 ± 2.48	0.236
P	0.236	0.110
Maxilla	0.36 ± 0.90	0.51 ± 1.11	0.412
Mandible	−1.23 ± 3.16	−1.74 ± 3.00	0.010
P	0.025	0.002
Adjustment	Mean/%	Increase/n	Decrease/n
Brightness	−1.28 ± 3.15	11	27
Contrast	2.90 ± 3.75	33	5