IOTN Flashcards
What dose the IOTN measure?
IOTN measures the worst feature of a malocclusion
What dose IOTN stands for?
Index of Orthodontic treatment need
Talk about IOTN
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
DHC - what is it used for?
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.
MOCDO - What dose it stands for?
M- Missing teeth O- Overjets (including reverse) C- Crossbites D- Displacement of contact points O- Overbites (including open bites)
DHC - talk about grades
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
DHC - ‘‘a ‘’
a overjet
DHC - ‘‘b ‘’
b reverse overjet
DHC - ‘‘c’’
c crossbite
DHC - ‘‘d’’
d displacement
DHC - ‘‘e
e open bite
DHC - ‘‘f
f deep bite
DHC - ‘‘g
g good occlusion
DHC - ‘‘h
h hypodontia
DHC - ‘‘t
IOTN?
t part erupted, tipped, impacted
4t Partially erupted teeth, tipped and impacted against adjacent teeth
DHC - ‘’s
IOTN?
s submerged teeth
5s Infraoccluded deciduous teeth
DHC - ‘‘p
IOTN?
p cleft
5p Defects of cleft lip and palate and other craniofacial anomalies
DHC - ‘‘l
IOTN?
l post lingual crossbite
4l Posterior lingual crossbite with no functional occlusal contact in one or both buccal segments
DHC - ‘‘i
i impacted
DHC - ‘‘x
IOTN?
x supernumerary
4x Presence of supernumerary teeth
Aesthetic Component - talk about it
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
AC - grades
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
AC - guidlines
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
IOTN 5i
Impeded eruption of teeth (except 8s) due to crowding, displacement, the presence of supernumerary teeth, retained deciduous teeth and any pathological cause
IOTN 5h
5h Extensive hypodontia with restorative implications
> 1 tooth missing in any quadrant requiring pre-restorative orthodontics
IOTN 5a
5a Increased overjet greater than 9mm
IOTN 5m
Reverse overjet >3.5mm
with reported masticatory
and speech
difficulties
What is the IOTN ?
Less extensive hypodontia
requiring pre-restorative orthodontics or
orthodontic space closure to obviate the need for a prosthesis
4h
IOTN 4a
4a Increased overjet > 6mm = 9mm
IOTN 4b
4b Reverse overjet
>3.5mm with no masticatory or speech difficulties
IOTN 4m
Reverse overjet >1mm but
IOTN 4c
4c Anterior or posterior crossbites with >2mm discrepancy between rcp and icp
What is the IOTN ?
Severe contact point displacements > 4mm
4d
IOTN 4e
4e Extreme lateral or anterior open bites >4mm
IOTN 4f
4f Increased and complete overbite with gingival or palatal trauma
What is the IOTN?
Increased overjet >3.5mm but =6mm with incompetent lips
3a
IOTN 3b
3b Reverse overjet > 1mm = to 3.5mm
IOTN 3c
3c-Crossbite<2mm discrepancy between rcp icp
IOTN 3d
3d Contact point displacements>2mm=4mm
IOTN 3e
3e Lateral or anterior open bite > 2mm = 4mm
IOTN 3f
3f Deep overbite complete on gingival or palatal tissues but no trauma
IOTN 2a
2a Increased overjet >3.5=6mm with competent lips
What is the IOTN ?
Reverse overjet > 0mm = 1mm
2b
IOTN 2c
2c Ant or post crossbite =1mm discrepancy between rcp and icp
IOTN 2d
2d Contact point displacements >1mm=2mm
IOTN 2e
2e Ant or post openbite >1mm = 2mm
IOTN 2f
2f Increased overbite>/=3.5mm without gingival contact
IOTN 2g
2g Pre-normal or post-normal occlusions with no other anomalies-includes up to half a unit discrepancy
Extremely minor malocclusions including contact point displacements <1mm
What is the IOTN?
IOTN 1
