D12

#12. The upper lateral incisor has both similarities and differences to the upper central incisor. It has, practically always, one canal with an oval or round cross-section. However, the apical canal often curves distally, which makes the preparation much more difficult than in the upper central incisor. Sometimes the root tip curves labially, which is difficult to see in the radiograph, a similar situation to the palatal roots of upper molars, which appear straight radiographically but typically have a buccal apical curvature.

---