Table 3.

Sensitivity, specificity and Az value for approximal caries.

Sensitivity
Caries level	X-ray		SS-OCT
	Mean	SD	Mean	SD
Enamel dem	0.83	0.13	0.93	0.059
Enamel caries	0.62	0.12	0.86	0.14
Dentin superficial	0.35	0.097	0.62	0.22
Dentin deep	0.35	0.10	0.34	0.27
Specificity
Caries level	X-ray		SS-OCT
	Mean	SD	Mean	SD
Enamel dem	0.54	0.23	0.64	0.18
Enamel caries	0.76	0.19	0.84	0.10
Dentin superficial	0.92	0.043	0.93	0.041
Dentin deep	0.98	0.015	0.98	0.029
Az value
Caries level	X-ray		SS-OCT
	Mean	SD	Mean	SD
Enamel dem	0.69	0.065	0.78	0.10
Enamel caries	0.69	0.065	0.85	0.062
Dentin superficial	0.64	0.049	0.77	0.10
Dentin deep	0.67	0.051	0.66	0.13

SD: standard deviation.

Enamel dem: enamel demineralization.

Enamel caries: enamel caries with cavitation.

Dentin superficial: superficial dentin caries limited to the outer half of the dentin thickness.

Dentin deep: deep dentin caries penetrates to the inner half of the dentin.

SS-OCT: swept-source optical coherence tomography.