Mandibular Canines

Question 1

For mandibular canines, what is the approximate age at eruption?

Answer 1

9-11 years. Approximately 1 year before maxillary canines.

Question 2

For mandibular canines, what is the crown shape when seen from facial/lingual view?

Answer 2

Trapezoid

Question 3

For mandibular canines, what are the number of cusps? How does the middle facial lobe compare to that of the maxillary canine? How does the cingulum of the mandibular canine compare to that of the maxillary canine?

Answer 3

4 cusps. The middle facial lobe is less prominent on the mandibular canine. The cingulum (4th lobe) is also smaller in the mandibular canines.

Question 4

How does the incisocervical distance of the mandibular canine crown compare to the incisocervical distance of the maxillary canine crown? How about root length?

Answer 4

The mandibular canine has a longer incisocervical crown length and a slightly shorter root length. The canines are the longest teeth in the mouth.

Question 5

For mandibular canines, how do the appearances of the mesial and distal outlines compare from the facial/lingual view?

Answer 5

Mesial outline: Convex. Mesial cusp ridge meets the mesial surface at a rounded edge (less round than D surface).
Distal outline: More convex than mesial, but may have slight concavity in cervical 1/3 of tooth. Distal cusp ridge twice as long as mesial cusp ridge. Very rounded DI corner.

Question 6

For mandibular canines, what are the heights of contour (occlusogingival contact points) for the mesial and distal faces?

Answer 6

Mesial: Incisal 1/3
Distal: Incisal 1/3; just below the mesial contact

Question 7

Are lingual pits and grooves common in mandibular caninces as they are in maxillary canines?

Answer 7

No

Question 8

For mandibular canines, how does the distal marginal ridge compare to the mesial marginal ridge?

Answer 8

The distal marginal ridge is more rounded, thicker and shorter.

Question 9

For mandibular canines, from the mesial/distal view what is the crown shape?

Answer 9

Triangular or wedge shaped.

Question 10

For mandibular canines, how do the facial and lingual outlines compare from a proximal view?

Answer 10

Facial Outline: only slightly convex, mostly in cervical 1/3. Wears facets in incisal 1/3.
Lingual Outline: Convex cervical 1/3 (cingulum)
Concave middle and incisal 1/3s (lingual fossa)

Question 11

For mandibular canines, what are the heights of contour of the facial and lingual faces?

Answer 11

Both cervical 1/3. Facial height of contour is more incisal than mandibular incisors, however.

Question 12

For mandibular canines, what is the crown shape as seen from the incisal/occlusal view?

Answer 12

Assymetrical diamond, due to distal bulge.

Question 13

For mandibular canines, how do the facial and lingual outlines appear from an incisal/occlusal view?

Answer 13

Facial outline: Convex. Facial middle lobe NOT prevalent as it is in maxillary canine. Distal side may appear flat or notched.
Lingual outline: Convex (cingulum)

Question 14

For mandibular canines, is there a curve in the incisal edge?

Answer 14

Yes, slightly mesio-distally.

Question 15

For mandibular canines, how is the cingulum oriented?

Answer 15

It is small and is either centered or is slightly distal of center on the lingual face

Question 16

For mandibular canines, how many mandibular canine roots are found?

Answer 16

1

Question 17

In what tooth do we find bifurcation at the root apex?

Answer 17

Mandibular canine root

Question 18

Describe the mandibular canine root. 5 physical features.

Answer 18

Conical shaped. Broad B-L. Tapers to rounded apex. Dilacerates to mesial or distal, usually distal. Triangular shape in cross section.

Question 19

For mandibular canine roots, how many pulp canals are present? What is the pulp chamber shape in cross section?

Answer 19

1 pulp canal generally, 2 if root is bifurcated. Pulp chamber appears oval or figure eight in cross section.

Question 20

For mandibular canines, are mammelons present on incisal edge?

Answer 20

No