Table 3. Mean values of the area under the ROC curve (AUC ROC), sensitivity, and specificity according to each crown type and gap size .

		AUC ROC	Sensitivity	Specificity
Metal-ceramic	Gap 0.3 mm	0.21	0.16	0.73
	Gap 0.5 mm	0.28	0.20	0.68
	Total	0.28	0.21	0.68
All-ceramic	Gap 0.3 mm	0.29	0.21	0.53
	Gap 0.5 mm	0.39	0.19	0.48
	Total	0.32	0.21	0.54