IOTN Grade 3 (Moderate)
This grade indicates a borderline need for treatment and can be classified as follows:
| 3a | Increased overjet greater than 3.5mm but less than or equal to 6mm with incompetent lips. |
| 3b | Reverse overjet greater than 1mm but less than or equal to 3.5mm. |
| 3c | Anterior or posterior crossbites with greater than 1mm but less than or equal to 2mm discrepancy between retruded contact position and intercuspal position. |
| 3d | Contact point displacements greater than 2mm but less than or equal to 4mm. |
| 3e | Lateral or anterior open bite greater than 2mm but less than or equal to 4mm. |
| 3f | Deep overbite complete on gingival or palatal tissues but no trauma. |