Table 2.

Radiographic score system

Score 0	No visible radiolucency (Figure 7)
Score 1	Radiolucency in the outer half of the enamel (Figure 8)
Score 2	Radiolucency in the inner half of the enamel (Figure 9)
Score 3	Radiolucency in the dentine; broken enamel–dentine border without obvious spread in the dentine (Figure 10)
Score 4	Radiolucency with obvious spread in the outer half of the dentine
Score 5	Radiolucency with obvious spread in the inner half of the dentine