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Table 1 Eccles index [5]

From: A plea for the development of an universally accepted modular tooth wear evaluation system

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