4. CHARACTERISTICS :
Resemble those of the
mandibular canine :
1. The buccal cusp is long &
sharp.
2. The MB cusp ridge is
shorter than the DB cusp
ridge.
3. The BL measurement is
similar to that of the canine.
4. The occlusal surface slopes
sharply lingually in a
cervical direction.
5. The outline form of the
occlusal aspect resembles
the outline form of the
incisal aspect of the canine.
Resemble those of the
second mandibular
premolar:
1. Except for the longer cusp,
the outline of crown & root
from the B aspect
resembling the second
premolar.
2. The contact areas , M&D
,are nearly at the same
level.
3. The curvatures of the
cervical line , M&D ,are
similar.
4. It has more than one cusp.
5. The root length is similar to
that of the second premolar
5.
6. BUCCAL
ASPECT:
Mesial contact
Trapezoidal with the
area located
D contact
shorter of the the
cervical to uneven
area is
sides at the cervix
junction of the
almost at
occlusal &
the same
M outline is third
middle
level
D outline is
straight or
slightly concave
sligthly
concave
D
Root is
cone
shape
Shallow D
developmental
depression
B ridge is
prominent
M slope is
shorter than
D slope
B cusp is
The B surface
pointed
is more convex
& large the
than
The
maxillary
cervical
premolars
line is
convex root
Shallow M
M
wise
developmen
tal
depression
7. LINGUAL ASPECT:
L cusp is
short,
small
&less
developed
M
The cervical
portion of the
crown
lingually is
narrow
&convex,with
concavities
between the
cervical line
& contact
areas
Crown &
root taper
markedly
toward the
lingual
D fossa
M
fossa
Contact areas &
marginal ridges
are pronounced
ML
developmenta
Pointed
l groove
apex
The root is
much narrower
on the L side
forming a
smooth narrow
ridge
L cusp
tip is
pointed
D
8. The crown
B
MESIAL ASPECT: cusp tip isis
outline
B
outline
is
convex
B
B cusp is
much higher
than the
lingual cusp
nearly centered
roughly
over the root ,or
rhomboidal
it may be buccal
to the center
Crown surface
is convex at
the M contact
The crown
L outline is
area
appears
less convex
overhanging
Then it becomes
than the The
B
ML root in a
the
sharply concave
groovelingual of
extent
between this area
concavity
direction
& cervical line The
Crest of
is 1 mm
curvature
or even cervical
near the
Deep line is
less
slightly
middle
developmental
concave
third
groove
root
wise
The
differenc
L cusp is
e in
in line
height is
with the
about 1/3
lingual
of the
border of
crown
the root
length
L
Crest of
curvature
is lingual
to the
lingual out
line of the
root
9. DISTAL ASPECT:
D marginal ridge is
more coronal &
horizontal than the
M
It is confluent with
the L cusp ridge
L
D contact
area is
broader
B
The cervical
line is almost
straight
The root surface
distally is more
convex Shallow
developmental
depression
10. OCCLUSAL ASPECT:
The middle B
lobe forming
the B cusp
makes up the
major bulk of
the the tooth
B
B ridge is
prominen
t
heavy B
triangular
ridge
M
M dg
Roughly
ML
diamond
dg
shape
Dd
pit
DB & MB line
angles are
prominent &
M triangular
D dg is
round
fossa
crescent
Is linear in form
shape
L cusp
is
small
L
D
D
triangul
ar fossa
is more
circular
Small L
triangular
ridge
