The crown and root of the maxillary canine are narrow mesiodistally than the central incisor. The cervico-incisal length of the crown is much longer than any other anterior tooth, with the exception of the maxillary central incisor. Table V list the
chronological data of maxillary canine.
The mesial half of the crown of the maxillary canine resemble a portion of an incisor and contact with lateral incisor. The distal half, on the other hand, resembles a portion of a premolar and contact the first
premolar. The incisal portion of the crown is thicker labiolingually then that of the incisors, and the cingulum shows greater development.
- It is pentagonal in outline. The mesial outline
is convex from the cervix to the center of the contact area at the junction between the middle and incisal thirds of the crown.
- The distal outline between the cervical line and the distal contact area which is situated at the center of the middle
third. The mesial contact area is at a lower level than the distal.
- The cusp has a mesial and distal slopes. The mesial one is shorter and shows tendency toward concavity, while the distal slope shows tendency toward convexity. The cervical line is
convex root wise. Faint mediolabial and distolabial developmental grooves can be seen.
- The labial surface is smooth except for a shallow depression mesially and distally dividing the crown into its three labial lobes. The middle lobe is more developed
than the other two which result in formation of a ridge on the labial surface , the labial ridge, which runs from the cervical line to the tip of the cusp in a curved manner inclined mesially at its center. The areas mesial to the crest of this ridge exhibits
convexity while area distal to it tends toward concavity.
- The root appears slender form the labial aspect and is conical with blunt apex. The root may show either mesial or distal curvature, mostly distal, near the apex. The labial surface of the
root is smooth and convex.
- The crown and root are narrower lingually than labially. The cervical line from is less convex than on the labial surface. Below the cervical line is a
well developed cingulum. The mesial and distal marginal ridges are strongly developed.
- The area incisal to the cingulum is concave forming the lingual fossa. Very often the lingual fossa show a well developed lingual ridge extending from the
cusp tip to a point near the cingulum dividing the lingual fossa into mesial and distal.
- The root is narrow when viewed from the lingual aspect than the labial and is smooth and convex.
- The outline of the crown is wedge shaped with the greatest measurement at the cervical third. The wedge point at the tip of the cusp. The labial outline is more convex from the cervical line to the cusp tip than any other maxillary anterior tooth.
The lingual outline is convex below the cervical line, representing the cingulum then continue as a straight line curves toward the cusp.
- The relation of the tip of the cusp to the long axis of the root is different from that of maxillary incisors.
A line bisecting the cusp is on long axis of the tooth or labial to it.
- The mesial surface of the crown is convex at all points except for small circumscribed area above the contact area where the surface is concave of flat to the cervical line.
- The outline of the root is conical with tapered blunt or pointed apex. The root may curve labially at apical third. The mesial surface of the root appears broad with a shallow developmental depression for part of the root length which helps to anchor the
tooth to the alveolus and prevent rotation.
This aspect is similar to the mesial aspect except that the cervical line shows less curvature toward the cusp tip. The distal marginal ridge
is heavier and more irregular than the mesial one and the contact area is more cervically located in the middle third. In addition, the surface is more concave above the contact area and the developmental groove is more pronounced.
The labiolingual dimension is greater than the mesiodistal dimension. The cusp tip is labial and mesial to the center of the crown. The ridge of the meddle labial lobe is very noticeable from the incisal aspect. It attains its greatest
convexity at the cervical third of the crown, becoming broader and flatter at the middle and incisal thirds.
- It consists of the pulp chamber and a single root canal. Labiolingual section shows
a narrow pulp chamber that points incisally. The root canal is wide in the cervical half of the root than any other tooth. The canal then narrows to average width on its way to the apical foramen.
- On mesio-distal section the pulp cavity is much narrower
and similar to those of the incisors. It has much longer and tapered root canal.
- On cervical cross section the pulp cavity appears even narrower and the root canal is eleptical rather than round and centered over the root. The canal is wider labiolingually