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THE DENTAL HEALTH COMPONENT OF THE INDEX OF ORTHODONTIC TREATMENT NEED (IOTN)

1 2 3 4 5

a OVERJET

I

N

C

LU

D

E

S

M

I

N

O

R

C

O

NT

A

C

T

S

P

OI

N

T

D

I

S

P

L

A

C

E

M

EN

T

S

L

E

S

S

T

H

A

N

1mm

3.5 6mm

COMPETENT

LIPS

3.5 6mm

INCOMPETENT LIPS6 9mm 9mm +

bREVERSEOVERJET

(see M)

0 1mm 1 3.5mm3.5mm +No masticatory or

Speech Difficulties

c

CROSSBITE

ANTERIOR/

POSTERIOR

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IOTN: Aesthetic Component!