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18
IOTN
Index of treatment need
Help determine the severity of malocclusion
M
5
(Very Great Need)
5
(very great
need)
O
5i
5 i
Impeded eruption of teeth (with exception of third molars) due to crowding, displacement, the presence of supernumerary teeth, retained deciduous teeth, and any pathological cause
5h
5h
Extensive hypodontia with restorative implications (more than one tooth missing in any quadrant) requiring pre orthodontic treatment
5a
5a
Increased overjet greater than 9 mm
5m
5m
Reverse overjet greater than 3.5 mm with reported masticatory and speech diffulties
5p
5p
Defect of cleft lip and palate and other craniofacial anomalies
5s
5s
Submerged deciduous teeth
M
O
4
(great need)
4
(Great Need)
O
D
C
4h
4 h
Less extensive hypodontia requring pre restorative orthodontic space closure to obviate the need for a prosthesis
4a
4a
Increased overjet 6.1 - 9 mm
4b
4 b
Reverse overjet greater than 3.5 mm with no masticatory or speech difficulties
4m
4m
Reverse overjet 1.1-3.5 mm with recorded masticatory and speech difficulties
4c
4 c
Ant or post. crossbites with greater than 2 mm discrepancy between retruded contact position and intercuspal position
4l
4 l
Posterior lingual crossbite with no functional occlusal contact in one or both buccal segments
4d
4d
Severe displacement of teeth, greater than 4 mm
4e
4 e
Extreme lateral or anterior open bites, greater than 4 mm
4f
4 f
Increased and complete overbite with gingival or palatal trauma
4t
4t
Partially erupted teeth, tipped and impacted against adjacent teeth
4x
4x
Supplemental teeth
O
3
(Moderate Need)
3
(borderline need)
D
C
3a
3a
Increased overjet 3.6mm - 6mm with incompetent lips
3b
3b
Reverse overjet 1.1 - 3.5 mm
3c
3c
Anterior or posterior crossbites with 1.1-2 mm discrepancy
3d
3d
Displacement of teeth 2.1 - 4mm
3e
3e
Lateral or anterior open bite 2.1 - 4 mm
3f
3f
Increased and complete overbite without gingival trauma
O
2
(little need)
2
(Little Need)
O
D
C
2a
2a
Increased overjet 3.6mm - 6mm with incompetent lips
2b
2b
Reverse overjet 0.1 - 1 mm
2c
2c
Anterior or posterior crossbites with up to 1mm discrepancy between retruded contact position and intercuspal position
2d
2d
Displacement of teeth 1.1 - 2 mm
2e
2e
Anterior or posterior open bite 1.1 -2 mm
2f
2f
Increased overbite 3.5 mm or more, without gingival contact
2g
2g
Prenormal of postnormal occlusions with other anomalies includes up to half a unit discrepancy
1
(No need)
1 (no need)
Extremely minor malocclusions including displacement less than 1 mm