BASIM ZWAIN LECTURES
Professor Dr. Basim Zwain
Faculty of Dentistry
University of Kufa
Notes about the canines
They are placed in the corner of the
mouth, which help in keeping facial
expression, and they are between
incisors and the premolars.
They are the longest teeth in the mouth.
They are the most stable teeth in the
a) Large labiolingual thickness of the
b) Long roots are anchored well in the
c) The crown’s shape promotes
cleansiness so they are less prone to
The middle labial lobe is highly
developed incisally into a strong
well formed cusp.
Principal identifying features
Single pointed cusp with the distal
slope of the cusp is longer than the
Marked convex labial outline and
bulky palatal cingulum.
Very long single root.
The mesial outline of the crown is convex, with
the crest of curvature at the junction of the
incisal and middle thirds.
The distal outline of the crown is slightly
concave from the cervical line to the crest of
curvature which is at the centre of the middle
The distal slope of the cusp is longer than the
The cervical line is convex, with the convexity
towards the root portion.
The labial surface of the crown is smooth except
for shallow depressions mesially and distally
dividing the three labial lobes.
The middle lobe is much more developed
producing the labial ridge.
The root is long, conical, and the apex is distally
The tooth is narrower lingually than labially.
The cingulum is larger than the max. incisors.
A well developed lingual ridge confluent with
the cusp tip, which divides the lingual fossa into
There are developmental depressions mesially
and distally extending for most of the root
The labial and lingual outlines of the
crown are more convex than the max.
The cervical line curvature is 2.5mm.
A line bisecting the cusp is labial to a
line bisecting the root.
There is a shallow developmental
depression on part of the root.
The cervical line curvature is less
distally than mesially.
The developmental depression of the
root is more pronounced.
The labiolingual dimension is greater
than the mesiodistal.
The ridge of the middle labial lobe is
very noticeable labially. It’s greatest
convexity is at the cervical third, and as it
reaches the cusp tip it becomes flatter.
The cingulum is well developed and
makes a small arc when compared with
the labial outline which is a big arc.
The cusp tip is labial to the center
labiolingually, and mesial to the center
Principal identifying features
It is narrower mesiodistally and labiolingually than max. canine.
The lingual surface of the crown is smoother, with less cingulum
development and less bulk to the marginal ridges than the max.
The cusp is not as well developed as max. canine, and the cusp
ridges are thinner labiolingually.
The cusp tip is on a line with the center of the root, from the mesial
or distal aspect.
The mesial slope of the cusp is shorter than the distal slope.
The distal outline of the crown is more rounded than the mesial.
The mesial surface of the crown is nearly straight with the mesial
surface of the root, the contact area being near the mesioincisal
The distal contact area is more towards the incisal than the max.