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21 Cards in this Set

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  • Back
Mandibular first premolar:

# roots and cusps
1 root, 2 cusps
Mandibular first premolar:

Distinguishing traits
Prominent transverse ridge, lingually inclined occlusal table (only posterior tooth with this trait)
Mandibular first premolar:

Symmetry
Very asymmetric in mesial/distal profiles with prominent mesial bulge
Mandibular first premolar:

Groove
Mesiolingual groove
Mandibular first premolar:

Profile of tooth from occlusal point
Diamond shaped, "snake eyes"
Mandibular first premolar:

Contact area
Center of middle 1/3 of tooth
Mandibular first premolar:

What tooth does this resemble? Why?
Canine - buccal cusp much larger than lingual cusp (lingual resembles cingulum). Mesial marginal ridge like canine, distal is more distinct.
Mandibular first premolar:

Cusp tip relative to root
In line
Mandibular first premolar:

# of lobes
4
Mandibular first premolar:

Crown length
8.5
Mandibular first premolar:

Mesiodistal
7
Mandibular first premolar:

Buccolingual
7.5
Mandibular first premolar:

Facial contour height
Cervical third
Mandibular first premolar:

Lingual contour height
Middle third
Mandibular first premolar:

Root length
14
Mandibular first premolar:

Pulp canal
1
Mandibular first premolar:

Pulp horn
1
Mandibular first premolar:

Eruption age
10-12
Mandibular first premolar:

Root completed
12-13
How is the mandibular first premolar similar to a canine?
1) About same buccolingual measurement
2) Lingually sloped occlusal surface
Mandibular first premolar:

Buccal cusp
Tip is pointed and located slightly mesial to center of the crown