Oral Anatomy 2b - The Mandibular Permanent Canine
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Generally, what is the mandibular permanent canine like?
- This is similar to the maxillary canine, but smaller, more slender, and more symmetrical.
- The cusp is generally less well developed: indeed with attrition, the low cusp may be lost and the tooth may resemble a maxillary second permanent incisor.
How does the mandibular permanent canine appear from the incisal aspect?
From the incisal aspect, there are no distinct longitudinal ridges from the tip of the cusp onto the labial and lingual surfaces.
How does the mandibular permanent canine appear when viewed labially?
- Viewed labially, the incisal margin occupies only one-fifth of the crown height and the cusp is less pointed.
- The crown is narrower mesiodistally than that of the maxillary canine, so it appears longer, narrower and more slender.
- The mesial and distal profiles tend to be parallel or only slightly convergent towards the cervix.
- The labial and mesial surfaces are clearly defined, being inclined acutely to each other, whereas the labial surface merges gradually into the distal surface.
How does the mandibular permanent canine appear when viewed lingually?
- On the lingual surface, the cingulum, marginal ridges and fossae are indistinct.
- The lingual surface is flatter than the corresponding palatal surface of the maxillary permanent canine and simulates the lingual surface of the mandibular incisors.
How does the mandibular permanent canine appear when viewed mesially and distally?
Viewed mesially and distally, the wedge-shaped appearance of the canine is clear.
How does the mandibular permanent canine differ from the maxillary permanent canine?
- The proximal surfaces are longer than those of the maxillary canine.
- The labiolingual diameter of the crown near the cervix is less than the corresponding labiopalatal diameter of the maxillary canine.
What is the cervical margin and the root like in the mandibular permanent canine?
- The cervical margin of this tooth follows a course similar to that of the incisors.
- The crownward convexity on the mesial surface is generally more marked than that on the distal surface.
- The root is normally single, though occasionally it may bifurcate.
- In cross section, the root is oval, being flattened mesially and distally.The root is grooved longitudinally on both its mesial and distal surfaces.
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