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Eccles index [5]
| Class | Description |
|---|---|
| I | Superficial lesions involving enamel only |
| II | Localized lesions involving dentin for less than 1/3 of the surface |
| III | Generalized lesions involving dentin for more than 1/3 of the surface |
| IIIa | Facial |
| IIIb | Lingual and palatal |
| IIIc | Incisal and occlusal |
| IIId | Severe multisurface involvement |
