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31 Cards in this Set

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Maxillary vs. mandibular premolars:

1) Mesiodistally and faciolingually
2) Cusps
3) Occlusal table
4) Height of contour
5) Roots in cross section
6) Buccal surface angles
1) ~same size mesiodistally/lengthwise, maxillary premolars have greater faciolingual diameter

2) Maxillary have more distinct lingual cusps, mandibular buccal cusps more towards faciolingual midpoint.

3) Maxillary occlusal table centered faciolingually, mandibular occlusal table lingually displaced

4) Maxillary buccal @ cervical/lower 1/3 of crown, mandibular lower at about cervical line. Maxillary lingual @ junction of cervical and middle 1/3s, lingual higher in upper middle.

5) Mandibular premolar roots rounder, maxillary have mesial root concavities

6) Maxillary buccal surface straighter from height of contour to cusp tip - mandibular more convex.

5)
Maxillary first premolars

Proximal contacts
Mesial/distal; middle third
Maxillary first premolars

Shoulders
Prominent
Maxillary first premolars

Buccal cusp location
Lingual cusp location
Buccal cusp towards distal
Lingual cusp towards mesial
Maxillary first premolars

Cusp ridges
Longer mesial ridge
Maxillary first premolars

Cusp size/height compared to second molars
Slightly wider/longer
Maxillary first premolars

Buccal surface vs. lingual surface (width wise)
Buccal surface is wider than lingual surface.
Maxillary first premolars

What is a significant, distinguishing feature on the mesial side
Mesiomarginal groove, mesial concavity that is in the root AND crown **distinguishing feature**
Maxillary first premolars

Shape of profile from occlusal aspect
Hexagonal
Maxillary first premolars

Central groove
Long
Maxillary first premolars

Supplemental grooves
Usually not present
Maxillary first premolars

# of lobes
4
Maxillary first premolars

# of pulp horns
2
Maxillary first molars

Mesiodistal
7.0
Maxillary first premolars

Crown length
8.5
Maxillary first premolars

Buccolingual
9.0
Maxillary first premolars

Facial height of contour
Cervical third
Maxillary first molars

Lingual height of contour
Middle third
Maxillary first premolars

Root length
14
Maxillary first molars

Root grooves
Distinct, longitudinal
Maxillary first premolars

# of roots
Usually 2
Maxillary first premolars

# of pulp canals
Often 2
Maxillary first premolars

Age of eruption
10-11
Maxillary first premolars

Root completed
12-13
Maxillary first premolars

Where are bifurcated roots located
Buccal and lingual
Maxillary first premolars

Cross section shape
Kidney bean shape because of concavity
Maxillary first premolars

Buccal cusp vs. lingual cusp size
Buccal cusp is longer/sharper than lingual
Maxillary first premolars

Shape from buccal aspect
Trapezoid
Maxillary first premolars

vs. anterior teeth
Wider faciolingually than mesiodistally, broader contact areas
Maxillary first premolars

What is an identifying characteristic from the facial aspect?
Mesial cusp slope is longer than the distal cusp slope. Only tooth in the mouth with a longer mesiobuccal cusp than distobuccal.
When viewed from the mesial, an identifying characteristic of the maxillary first premolar is?
Presence of a mesial developmental depression