ICDAS

ICDAS stands for International Caries Detection and Assessment System.

The ICDAS uses a two-stage process to record the status of the caries lesion. The first is a code for the severity of the caries lesion and the second is for the restorative status of the tooth. The status of the caries severity is determined visually on a scale of 0–6: • 0 = sound tooth structure • 1 = first visual change in enamel • 2 = distinct visual change in enamel • 3 = enamel breakdown, no dentine visible • 4 = dentinal shadow (not cavitated into dentine) • 5 = distinct cavity with visible dentine • 6 = extensive distinct cavity with visible dentine

This severity code is paired with a restorative/sealant code 0–8: • 0 = not sealed or restored • 2 = sealant, partial • 3 = sealant, full; tooth-coloured restoration • 4 = amalgam restoration • 5 = stainless steel restoration • 6 = ceramic, gold, porcelain-fused-to-metal (PFM) crown or veneer • 7 = lost or broken restoration • 8 = temporary restoration

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American Dental Association Caries Classification System (ADA CCS) and International Caries Detection and Assessment System (ICDAS) chart showing visual caries detection.