Table 2.

Mean wt% of carbon, nitrogen, oxygen, phosphorous, and calcium in sound enamel and lesion.

	Chemical content in normal enamel and in lesion (weight%)
	Carbon		Nitrogen		Oxygen		Phosphorous		Calcium
	Sound	Lesion	Sound	Lesion	Sound	Lesion	Sound	Lesion	Sound	Lesion
Mean	6.21	23.33	2.04	5.49	41.02	40.72	15.90	11.34	34.82	19.13
Median	5.68	18.74	1.74	5.45	39.58	40.90	15.54	11.16	30.06	18.84
STD	2.13	11.95	1.02	1.67	3.68	6.30	1.30	01.30	4.18	7.97