Download - Canines
CANINESCANINES
DR. SYED SADATULLAHDR. SYED SADATULLAHIBNSINA NATIONAL COLLEGEIBNSINA NATIONAL COLLEGE
JEDDAHJEDDAH
Introduction
Canines are very long and stable teeth
There are four canines placed at the corner of the mouth and hence called the ‘corner stones’ of the dentition
They have a single pointed cusp (also called cuspids)
Maxillary canine erupts between 10-12 years and mandibular canine erupts between 9-10 years of age
Maxillary CanineLabial aspect The crown of maxillary canine is narrower mesiodistally than
that of maxillary central incisor.
• The incisal aspect has a large cusp with a pointed cusp tip
• It has two slopes (cusp ridges), the mesial slope being shorter than the distal slope
• The labial surface is smooth and bulky in the middle because of the labial ridge
Labial aspect
Labial ridge
Cusp tip
Distal cusp ridge Mesial Cusp
Ridge
Lingual aspect
• The crown and root are narrower lingually
• The cingulum is well developed, large and sometimes pointed like a cusp
• Occasionally a well developed lingual ridge is seen that divides the lingual fossa into mesial and distal lingual fossae
• Heavy marginal ridges are associated with well formed cingulum and fossae
Lingual aspect
Cingulum
Distal marginal ridge
Distal lingual fossa
Lingual ridge
Mesial marginal ridge
Mesial lingual fossa
Mesial aspect
• From the mesial aspect canine looks similar but bulkier than maxillary central incisor
• Maxillary canine is the widest anterior tooth labiolingually
• The cervical line curvature is towards the cusp (incisally)
• The contact area is near the junction of the incisal and middle third
Mesial aspect
Distal aspect• Distal surface is very similar to the mesial surface
• The cervical line exhibits less curvature
• The contact are is near the middle third
Distal aspect
Incisal aspect
• The labiolingual dimension is greater than the mesiodistal dimension
• The cusp tip is labial to the centre of the crown labiolingually and mesial to the centre mesiodistally
• The labial ridge and the cingulum are very noticeable from this aspect
Incisal aspect
Root – only oneThe root is the longest and strongest of all the teeth in the
dentition
The mesial and distal surfaces of the root have developmental
depressions.
2.5 1.5 7.0 8.0 5.5
7.5 17.0 10.0
Curvature of Cervical Line
M D
Labiolingual
Diameter at
Cervical Line
Labiolingual
Diameter at
Crest of Curvature
Mesiodistal
Diameter at
Cervical Line
Mesiodistal
Diameter at
Contact Area
Root
Length
Crown Length
Average Dimensions in millimeters
Mandibular Canine
Labial aspect
Mandibular canines are similar to maxillary canines except that they are slightly narrower mesiodistally
Mesial outline of the crown is straight and inline with the mesial outline of the root
The mesial cusp ridge is smaller than the distal cusp ridge
Lingual aspect The lingual surface of the crown is smooth and flat simulating
the surface of mandibular lateral incisor
Cingulum is less prominent and marginal ridges are less distinct
Mesial and Distal aspects These aspects are very similar and the cervical line curves
more on the mesial aspect
The contact area on mesial aspect is in the incisal third and a little higher on the distal third
Incisal aspect Like maxillary canine the labiolingual dimension is more than
the mesiodistal dimension
The cusp tip appears inclined in a lingual direction
Root The root is shorter by 1 or 2 mm
The developmental depression is more pronounced on the lower canine
Labial aspect Lingual aspect
Mesial aspect Distal aspect
Incisal aspect