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Development of an illustrated index of tooth appearance-perception-based quantification of tooth discolouration and surface defects.
[dentinogenesis imperfecta]
Existing
indices
to
quantify
tooth
discolouration
are
mostly
aetiology-
specific
.
An
index
of
tooth
appearance
(
IOTA
)
,
derived
from
all
types
of
tooth
discolouration
and
surface
defects
,
would
allow
the
quantification
of
attractiveness
for
psychological
assessment
and
treatment
planningTo
develop
a
perception
based
IOTA
for
quantification
of
all
forms
of
tooth
discolouration
and
surface
defects
.
One
hundred
images
of
discoloured
teeth
were
twice
ranked
by
a
panel
of
judges
according
to
perceived
attractiveness
.
Mean
image
score
was
then
used
to
arrange
the
images
into
a
continuum
of
attractiveness
and
from
these
,
ten
images
were
selected
,
to
constitute
the
illustrated
IOTA
.
A
second
panel
of
judges
assessed
35
clinical
pictures
using
the
IOTA
,
on
two
occasions
.
The
first
100
images
were
assessed
with
a
correlation
of
0
.
79
-
0
.
81
between
the
two
ranking
sessions
and
with
intra-group
reproducibility
of
0
.
8
-
0
.
94
.
The
second
panel
of
judges
used
the
developed
IOTA
quickly
,
with
an
intra-
judge
correlation
of
0
.
87
and
inter-
judge
reliability
of
0
.
72
and
0
.
74
for
two
sessions
.
The
IOTA
could
be
used
by
clinicians
as
a
tool
for
quantifying
disfigurement
in
teeth
,
irrespective
of
aetiology
or
histology
.
Diseases
Validation
Diseases presenting
"second panel"
symptom
dentinogenesis imperfecta
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