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Available bone dimension for the implant placement in the anterior maxilla according to the NPC shape (in mm). Insufficient space (marked in red); minimal required dimensions (marked in yellow); sufficient space (marked in green).
| NPC Shape | ||||
|---|---|---|---|---|
| The Horizontal Dimensions of the Anterior Maxilla at Different Levels | Banana | Hourglass | Cylindrical | Funnel |
| Level A | 2.3 | 3.2 | 2.9 | 3.5 |
| Level B | 1.4 | 3.4 | 3.2 | 3 |
| Level C | 1.6 | 4 | 3.6 | 3.7 |
| Level D | 2 | 5.9 | 5.7 | 5.8 |
