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ICDAS classification:
Evidence based scoring system that is based on histological extent and clinical representation of carious lesions
ICDAS Class 0
Sound surface with no changes in translucency

ICDAS Class 1
First visual changes in enamel translucency visible only after prolonged drying

ICDAS Class 2
Distinct visual changes in enamel translucency visible when tooth is wet

ICDAS Class 3
Localized enamel breakdown and widening of fissures without visual signs of dentin or shadowing

ICDAS Class 4
Underlying shadowing from dentin with or without enamel breakdown

ICDAS Class 5
Distinct cavity with visible dentin

ICDAS Class 6
Extensive distinct cavity with visible dentin (deep and wide cavitation)

ADA Caries classification
(Proximal caries-Radiographic Scoring) Amount (5)
E1
E2
D1
D2
D3
E1
Radiolucency in the outer half of enamel

E2
Radiolucency in the inner half of enamel

D1
Radiolucency in the outer third of dentin

D2
Radiolucency in the middle third of dentin

D3
Radiolucency in the inner third of dentin
