Root Canal Morphology of Mandibular First Permanent Molars in an Indian Population

Table 3

Frequency of isthmi and apical deltas in mesial and distal roots.

Group (no. of roots)	Isthmi	Apical deltas
Mesial root (150)	45 (30%)	15 (10%)
Distal root (150)	15 (10%)	9 (6%)
Distolingual root (8)	—	—