Table 1. Kappa coefficients separately for each system irrespective of caries.

		Digora				Acteon
		Sharp		Un-sharp		Sharp		Un-sharp
		Sound	Caries	Sound	Caries	Sound	Caries	Sound	Caries
Intra-observer agreement	First observer	0.720
	Second observer	1.00	0.640	1.00	0.737	0.541*	0.700	0.541*	0.795
	First observation		0.931	1.00	0.800	0.641	0.927	0.641
	Second observation	0.720							0.769
Inter-observer agreement	First observer	1.00	0.736	1.00	0.877	0.451*	0.850	0.451*
	Second observer		0.848	1.00	0.780		0.782	1.00
	First observation					1.00			0.659
	Second observation								0.769