Table 7.

Results of the NNC performance on 15 subjects including 119 teeth including 75 vulnerable and 44 resistant teeth. NHL number of hidden layers, NSF number of selected features, $\alpha$ parameter used in feature selection by maximum weights approach

$\alpha$	NSF	Selected features	NHL	Accuracy (%)
0	105	All	1	94.1
0.44	27	40, 55, 58, 64, 67, 68, 70, 71, 72, 75, 76, 79, 84, 88, 93, 95, 102, 105	2	91.6
0.56	17	9, 12, 13, 24, 34, 40, 55, 64, 67, 68, 71, 72, 75, 76, 79, 84, 93	3	99.2
0.61	12	9, 12, 34, 55, 64, 67, 68, 71, 72, 75, 76, 79	4	98.3
0.64	9	9, 12, 34, 55, 64, 67, 75, 76, 79	5	99.2
0.67	7	9, 55, 64, 67, 75, 76, 79	6	95.8
0.69	6	9, 64, 67, 75, 76, 79	7	99.2
0.70	5	64, 67, 75, 76, 79	8	96.6