BASIM ZWAIN LECTURESDENTAL ANATOMY

PERMANENT CANINES

Professor Dr. Basim ZwainFaculty of DentistryUniversity of Kufa

Basim.zwayen@uokufa.edu.iq

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

mouth because:a) Large labiolingual thickness of the

tooth.b) Long roots are anchored well in the

alveolar bone.c) The crown’s shape promotes

cleansiness so they are less prone to caries.

PERMANENT CANINES

The middle labial lobe is highly developed incisally into a strong well formed cusp.

PERMANENT CANINES

MAXILLARY CANINES

Principal identifying features Single pointed cusp with the distal slope of the cusp is longer than the mesial slope. Marked convex labial outline and bulky palatal cingulum. Very long single root.

M D

MAXILLARY CANINES

Labial Aspect 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 third. The distal slope of the cusp is longer than the mesial slope. The cervical line is convex, with the convexity towards the root portion.

M D

MAXILLARY CANINES

Labial Aspect 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 curved.

M D

MAXILLARY CANINES

Lingual Aspect 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 two fossae. There are developmental depressions mesially and distally extending for most of the root length.

MAXILLARY CANINES

MD

Mesial Aspect The labial and lingual outlines of the crown are more convex than the max. incisors. 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.

MAXILLARY CANINES

Distal Aspect The cervical line curvature is less distally than mesially. The developmental depression of the root is more pronounced.

MAXILLARY CANINES

Incisal Aspect 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 mesiodistally.

MAXILLARY CANINES

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. canine. 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 angle. The distal contact area is more towards the incisal than the max. canine

MANDIBULAR CANINES

14

Thank you