1 — Distal root (molar tooth II); 2 — Mesial root (molar tooth II); 3 — Interradicular septum; 4 — Dentogingival fibres; 5 — Spiral interdental fibres; 6 — Root canal; Pulp canal; 7 — Root (molar tooth III); 8 — Interdental fibres
1 — Distal root (molar tooth II); 2 — Mesial root (molar tooth II); 3 — Interradicular septum; 4 — Dentogingival fibres; 5 — Spiral interdental fibres; 6 — Root canal; Pulp canal; 7 — Root (molar tooth III); 8 — Interdental fibres