Table 1. Accuracy ± standard deviation obtained with F-speed films and storage phosphor plate (SPP) images after 60 h, 80 h, 100 h and 120 h of acid demineralization.

	60 h	80 h	100 h	120 h
SPP	0.59 ± 0.11	0.60 ± 0.05	0.60 ± 0.05	0.72 ± 0.05
Film	0.53 ± 0.09a,b	0.56 ± 0.05a,b	0.73 ± 0.04	0.79 ± 0.04

^a Indicates significance with 100 h of demineralization.

^b Indicates significance with 120 h of demineralization.