Crown-Down Sequence:
1. Establish straight-line access to the canal orifice using SX.
2. Shape the coronal two-thirds of the canal, confirm the working length, and smooth the root canal with S1 and S2.
3. Shape the apical third with finishers F1 and F2. If needed, continue with F3, F4, and F5.

Sequence: SX → S1 → S2 → F1/F2 → F3/F4/F5