Oral Anatomy 3 - The Maxillary Second Premolar
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Generally, how does the maxillary second premolar appear?
Generally, this tooth is similar in shape to the maxillary first premolar, except for a few features.
How does the maxillary second premolar appear when viewed occlusally?
- Viewed occlusally, the mesiobuccal and distobuccal corners are more rounded and the mesial and distal profiles do not converge lingually, being nearly parallel.
- The occlusal surface appears more compressed, the mesiodistal dimension of the crown being smaller.
- The central fissure appears shorter and does not cross the mesial marginal ridge.
How does the maxillary second premolar appear from the buccal aspect?
- From the buccal aspect, the mesio- and disto-occlusal angles are less prominent.
- These features give the crown a 'narrow-shouldered' appearance.
What are the two cusps like for maxillary second premolar.
- The two cusps are smaller and more equal in size than those of the first premolar.
- The height of the buccal cusp is one-quarter of the height of the crown measured from the base of the occlusal fissure, while the height of th ebuccal cusp of the first premolar is up to one-half the height of the crown.
How does the maxillary second premolar appear when viewed palataly?
Viewed palatally, less of the buccal profile is visible.
How does the maxillary second premolar appear when viewed mesially and distally?
Viewed mesially and distally, tooth appears similar to the first premolar but there is no canine fossa or canine groove on the mesial surface.
What does the cervical margin and the root look like for a maxillary second premolar?
- The cervical margin appears similar to that of the maxillary first premolar but is slightly less undulating.
- The root is single
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