Table 4.

Three-dimensional classification of ECR.

Height	Circumferential spread	Proximity to the root canal
1: At cemento-enamel junction level or coronal to the bone crest (supracrestal) 2: Extends into coronal third of the root and apical to the bone crest (subcrestal) 3: Extends into mid-third of the root 4: Extends into apical third of the root	A: ≤90° B: >90° to ≤180° C: >180° to ≤270° D: >270°	d: Lesion confined to dentine p: Probable pulpal involvement