|
| Grade 5 (extreme/need treatment) |
| 5·i | Impeded eruption of teeth (except for third molars) due to crowding, displacement, the presence of supernumerary teeth, retained deciduous teeth, and any pathological cause |
| 5·h | Extensive hypodontia with restorative implications (more than 1 tooth missing in any quadrant) requiring prerestorative orthodontics |
| 5·a | Increased overjet greater than 9 mm |
| 5·m | Reverse overjet greater than 3.5 mm with reported masticatory and speech difficulties |
| 5·p | Defects of cleft lip and palate and other craniofacial anomalies |
| 5·s | Submerged deciduous teeth |
|
| Grade 4 (severe/need treatment) |
| 4·h | Less extensive hypodontia requiring prerestorative orthodontics or orthodontic space closure to obviate the need for a prosthesis |
| 4·a | Increased overjet greater than 6 mm but less than or equal to 9 mm |
| 4·b | Reverse overjet greater than 3.5 mm with no masticatory or speech difficulties |
| 4·m | Reverse overjet greater than 1 mm but less than 3.5 mm with recorded masticatory and speech difficulties |
| 4·c | Anterior or posterior crossbites with greater than 2 mm discrepancy between retruded contact position and intercuspal position |
| 4·l | Posterior lingual crossbite with no functional occlusal contact in one segment or both buccal segments |
| 4·d | Severe contact point displacements greater than 4 mm |
| 4·e | Extreme lateral or anterior open bites greater than 4 mm |
| 4·f | Increased and complete overbite with gingival or palatal trauma |
| 4·t | Partially erupted teeth, tipped and impacted against adjacent teeth |
| 4·x | Presence of supernumerary teeth |
|
| Grade 3 (moderate/borderline need) |
| 3·a | Increased overjet greater than 3.5 mm but less than or equal to 6 mm with incompetent lips |
| 3·b | Reverse overjet greater than 1 mm but less than or equal to 3.5 mm |
| 3·c | Anterior or posterior crossbites with greater than 1 mm but less than or equal to 2 mm discrepancy between retruded contact position and intercuspal position |
| 3·d | Contact point displacements greater than 2 mm but less than or equal to 4 mm |
| 3·e | Lateral or anterior open bite greater than 2 mm but less than or equal to 4 mm |
| 3·f | Deep overbite complete on gingival or palatal tissues but no trauma |
|
| Grade 2 (mild/little need) |
| 2·a | Increased overjet greater than 3.5 mm but less than or equal to 6 mm with competent lips |
| 2·b | Reverse overjet greater than 0 mm but less than or equal to 1 mm |
| 2·c | Anterior or posterior crossbite with less than or equal to 1 mm discrepancy between retruded contact position and intercuspal position |
| 2·d | Contact point displacements greater than 1 mm but less than or equal to 2 mm |
| 2·e | Anterior or posterior open bite greater than 1 mm but less than or equal to 2 mm |
| 2·f | Increased overbite greater than or equal to 3.5 mm without gingival contact |
| 2·g | Pre- or postnormal occlusions with no other anomalies (including up to half a unit discrepancy) |
|
| Grade 1 (no need) |
| 1· | Extremely minor malocclusions including contact point displacements less than 1 mm |
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