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Case Assessment and
Treatment Planning
IOTN -
Index Of Orthodontic
Treatment Need
The Index of Orthodontic Treatment Need (IOTN) assists
in the ranking of malocclusion in terms of the significance
of various occlusal traits for an individual’s dental health
and perceived aesthetic impairment, with the intention of
identifying those individuals who would most likely benefit
from orthodontic treatment. The index incorporates an
Aesthetic and Dental Health Component.
All the products listed relating to the Occlusal Indices
standards are copyright of the University of Manchester.
Ortho-Care (UK) Ltd act as sole distributor for these
products and pay a Royalty to the University for the
privilege.
No reproduction of any of the pictures or products may
be undertaken without prior permission from Ortho-Care
(UK) Ltd, and no reproduction of the Aesthetic Component
standard may be made either at actual size, or without a
watermark ‘copy’ across the images.
The Peer Assessment Rating Index (PAR
Index)
The Peer Assessment Rating Index was developed as a result of the
report of the Occlusal Index Committee, which was itself established
in 1986 as a direct result of the recommendations of the Schanshieff
Report. The PAR index
was constructed initially
with the help of the British
Orthodontic Standards
Working Party and was
subsequently validated by
weighting the constituent
components to conform
with the collective opinions
of 74 clinicians (specialists,
consultants, GDPs,
community dentists).
The PAR Index measures the degree of departure which the occlusion
of a set of study models has from the ideal. Hence it can be used to
measure treatment change by calculating the difference between the
scores obtained from pre- and post treatment models. The index is the
summation of several different components which make up malocclusion.
Crowding or spacing is assessed in each arch in terms of contact point
displacements. Labial occlusion is scored similarly in terms of antero-
posterior, transverse and vertical discrepancy (overbite, overjet,
centrelines).
The weighted version of the PAR Index results from the opinions of the
74 clinicians. There are only 7 components which are scored: labial
irregularity (upper and lower), buccal occlusion (left and right), overjet,
overbite, centreline.
The Occlusal Indices
The Occlusal Indices Starter Pack
The Occlusal Indices Start Pack contains all the components needed
for assessing the Index of Orthodontic Treatment Need (IOTN and
the Peer Assessment Rating (PAR Index)
Occlusal Indices Starter Pack
8000-942
1 x Occlusal Indices Booklet
1 x Aesthetic Component
50 x DHC Single Use Rulers
10 x PAR Index Single Use Rulers
