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Average palatal distance between accessory canals (ACs) and maxillary central incisors (MCIs) for implant placement according to NPC shape (in mm). Insufficient distance marked in red.
| NPC Shape | ||||
|---|---|---|---|---|
| ACs–MCIs Distance at the Different Levels | Banana | Hourglass | Cylindrical | Funnel |
| Level A | 1.18 | 0.9 | 0.8 | 1.05 |
| Level B | 1.19 | 1.1 | 1.08 | 1.17 |
| Level C | 0.8 | 1.25 | 1.7 | 1.3 |
