Table 2.

Classification of the mandibular cortical index in comparison to dual-energy X-ray absorptiometry test for diagnostic prediction in digital panoramic radiography and in the three thicknesses of the panoramic reconstruction of the CT cone beam (N = 54)

Test examinations	Gold s tandard DXA
	Groups	Low BMD	Normal BMD	Total
Digital panoramic radiography	Eroded (C2 or C3)	20	7	27
	No eroded (C1)	18	9	27
	Total	38	16	54
Panoramic reconstruction of the CBCT 5 mm	Eroded (C2 or C3)	24	9	33
	No eroded (C1)	14	7	21
	Total	38	16	54
Panoramic reconstruction of the CBCT 15 mm	Eroded (C2 or C3)	19	8	27
	No eroded (C1)	19	8	27
	Total	38	16	54
Panoramic reconstruction of the CBCT 25 mm	Eroded (C2 or C3)	20	6	26
	No eroded (C1)	18	10	28
	Total	38	16	54

BMD, bone mineral density; CBCT, cone-beam CT; DXA, dual energy radiographic absorptiometry;