IOTN

Question 1

What dose the IOTN measure?

Answer 1

IOTN measures the worst feature of a malocclusion

Question 2

What dose IOTN stands for?

Answer 2

Index of Orthodontic treatment need

Question 3

Talk about IOTN

Answer 3

Two elements Dental health (DHC) & Aesthetic components (AC)
DHC = to standardize the need for treatment
Attempt to rank malocclusion using the worse feature
Intention to identify individuals who would most likely benefit from orthodontic treatment
AC = Aesthetics of an individual can be identified and rated to a common scale

Question 4

DHC - what is it used for?

Answer 4

Categorizes the severity of malocclusion into 5 Grades

Order of severity relative to the long term detrimental effects on the dentition

Hierarchical order acronym M.O.C.D.O.

Question 5

MOCDO - What dose it stands for?

Answer 5

M- Missing teeth
O- Overjets (including reverse)
C- Crossbites
D- Displacement of contact points  
O-  Overbites (including open bites)

Question 6

DHC - talk about grades

Answer 6

Grades 1 – 5
1 lowest 5 highest score

Grade 3 Moderate need for treatment

Grade 4 and 5 Definite need for treatment
Grade 1 and 2 no need for tretment

Question 7

DHC - ‘‘a ‘’

Answer 7

a overjet

Question 8

DHC - ‘‘b ‘’

Answer 8

b reverse overjet

Question 9

DHC - ‘‘c’’

Answer 9

c crossbite

Question 10

DHC - ‘‘d’’

Answer 10

d displacement

Question 11

DHC - ‘‘e

Answer 11

e open bite

Question 12

DHC - ‘‘f

Answer 12

f deep bite

Question 13

DHC - ‘‘g

Answer 13

g good occlusion

Question 14

DHC - ‘‘h

Answer 14

h hypodontia

Question 15

DHC - ‘‘t

IOTN?

Answer 15

t part erupted, tipped, impacted

4t Partially erupted teeth, tipped and impacted against adjacent teeth

Question 16

DHC - ‘’s

IOTN?

Answer 16

s submerged teeth

5s Infraoccluded deciduous teeth

Question 17

DHC - ‘‘p

IOTN?

Answer 17

p cleft

5p Defects of cleft lip and palate and other craniofacial anomalies

Question 18

DHC - ‘‘l

IOTN?

Answer 18

l post lingual crossbite

4l Posterior lingual crossbite with no functional occlusal contact in one or both buccal segments

Question 19

DHC - ‘‘i

Answer 19

i impacted

Question 20

DHC - ‘‘x

IOTN?

Answer 20

x supernumerary

4x Presence of supernumerary teeth

Question 21

Aesthetic Component - talk about it

Answer 21

Scale of ten colour photographs showing different levels of dental attractiveness

Score reflects the aesthetic impairment

Developed to assess the impact of the appearance of the malocclusion on the patient

To determine the level of potential psychological damage

Used in conjunction with DHC
Patients can compare their teeth to photos

But it is subjective and difficult to accurately assess

Question 22

AC - grades

Answer 22

Grades 1 –10
1 most attractive 10 least attractive
Aesthetic =/> 6 qualify for NHS treatment
Grade 6 & 7 moderate /borderline need
Grade 8,9 & 10 Definite need for treatment

Question 23

AC - guidlines

Answer 23

The anterior teeth should be graded in their dental attractiveness as seen
No attempt should be made to predict the future appearance of the dentition
Stained restorations, chipped teeth, poor gingival conditions etc should be ignored in this assessment

Question 24

IOTN 5i

Answer 24

Impeded eruption of teeth (except 8s) due to crowding, displacement, the presence of supernumerary teeth, retained deciduous teeth and any pathological cause

Question 25

IOTN 5h

Answer 25

5h Extensive hypodontia with restorative implications | > 1 tooth missing in any quadrant requiring pre-restorative orthodontics

Question 26

IOTN 5a

Answer 26

5a Increased overjet greater than 9mm

Question 27

IOTN 5m

Answer 27

Reverse overjet >3.5mm with reported masticatory and speech difficulties

Question 28

What is the IOTN ? Less extensive hypodontia requiring pre-restorative orthodontics or orthodontic space closure to obviate the need for a prosthesis

Answer 28

4h

Question 29

IOTN 4a

Answer 29

4a Increased overjet > 6mm = 9mm

Question 30

IOTN 4b

Answer 30

4b Reverse overjet | >3.5mm with no masticatory or speech difficulties

Question 31

IOTN 4m

Answer 31

Reverse overjet >1mm but

Question 32

IOTN 4c

Answer 32

4c Anterior or posterior crossbites with >2mm discrepancy between rcp and icp

Question 33

What is the IOTN ? | Severe contact point displacements > 4mm

Answer 33

4d

Question 34

IOTN 4e

Answer 34

4e Extreme lateral or anterior open bites >4mm

Question 35

IOTN 4f

Answer 35

4f Increased and complete overbite with gingival or palatal trauma

Question 36

What is the IOTN? | Increased overjet >3.5mm but =6mm with incompetent lips

Answer 36

3a

Question 37

IOTN 3b

Answer 37

3b Reverse overjet > 1mm = to 3.5mm

Question 38

IOTN 3c

Answer 38

3c-Crossbite<2mm discrepancy between rcp icp

Question 39

IOTN 3d

Answer 39

3d Contact point displacements>2mm=4mm

Question 40

IOTN 3e

Answer 40

3e Lateral or anterior open bite > 2mm = 4mm

Question 41

IOTN 3f

Answer 41

3f Deep overbite complete on gingival or palatal tissues but no trauma

Question 42

IOTN 2a

Answer 42

2a Increased overjet >3.5=6mm with competent lips

Question 43

What is the IOTN ? | Reverse overjet > 0mm = 1mm

Answer 43

2b

Question 44

IOTN 2c

Answer 44

2c Ant or post crossbite =1mm discrepancy between rcp and icp

Question 45

IOTN 2d

Answer 45

2d Contact point displacements >1mm=2mm

Question 46

IOTN 2e

Answer 46

2e Ant or post openbite >1mm = 2mm

Question 47

IOTN 2f

Answer 47

2f Increased overbite>/=3.5mm without gingival contact

Question 48

IOTN 2g

Answer 48

2g Pre-normal or post-normal occlusions with no other anomalies-includes up to half a unit discrepancy

Question 49

Extremely minor malocclusions including contact point displacements <1mm What is the IOTN?

Answer 49

IOTN 1