Table 1 Classification of orthodontic treatment need using German orthodontic indication groups (KIG). A severity grade score more than or equal to 3 is the cut-off for orthodontic treatment for children (aged less than 18 years) in the public health insurance system
Malocclusion | Severity grade | |||||
|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | ||
A | Craniofacial Anomalies | Cleft palate and syndromes | ||||
U | Missing teeth | Agenesis or loss | ||||
S | Disturbance in tooth eruption | Impaction | Displacement | |||
D | Sagittal discrepancy increased overjet | < 3 mm | 3–6 mm | > 6–9 mm | > 9 mm | |
M | Sagittal discrepancy negative overjet | 0–3 mm | > 3 mm | |||
O | Vertical discrepancy open bite | < 1 mm | > 1–2 mm | > 2–4 mm | > 4 mm, habitually open | > 4 mm, skeletally open |
T | Vertical discrepancy deep bite | > 1–3 mm | > 3 mm, with / without mucosal contact | > 3 mm, with traumatic mucosal impingement | ||
B | Transverse discrepancy | Scissors bite | ||||
K | Transverse discrepancy crossbite | Buccolingually cusp-to-cusp relation | Bilateral crossbite | Unilateral crossbite | ||
E | Contact point displacement | < 1 mm | > 1–3 mm | > 3–5 mm | > 5 mm | |
P | Space deficiency | < 3 mm | > 3–4 mm | > 4 mm | ||