Oral Anatomy: Premolars Flashcards
Which is the largest of all premolars?
Max first PM
Which premolar has a prominent buccal ridge?
Max first PM
T/F: The max first premolar is the only permanent tooth with a distal cusp ridge greater than the mesial cusp ridge.
False
Only tooth with mesial cusp ridge greater than distal
Which tooth has a very prominent mesial marginal ridge groove?
Max first PM
For a max first PM, the occlusal shape is ________ and the proximal shape is ________.
hexagonal; trapezoidal
T/F: The max first PM has a prominent central pit.
False
Long central groove with mesial and distal pits
Which way do the two cusps tilt on a max first PM?
Buccal - distal
Palatal - mesial
makes sense because mesial cusp ridge of buccal cusp > distal cusp ridge
T/F: The buccal cusp of the max first PM is taller than the palatal cusp.
True
T/F: In the max 2nd PM, the distal cusp ridge is greater than the mesial cusp ridge.
True
T/F: The max 2nd PM has a more prominent buccal ridge than the max 1st PM.
False
What is the major difference of the occlusal table of a max 2nd PM versus the max 1st PM?
2nd PM has a shorter central groove and has more supplemental grooves (wrinkled appearance)
T/F: The buccal cusp of the max 2nd PM is taller than the palatal cusp.
False
Equal in height, unlike max 1st PM
Which is the smallest of all the premolars?
Mand 1st PM
A unique characteristic of the mand 1st PM is its prominent ________.
mesio-lingual groove
Which marginal ridge of the mand 1st PM is most prominent?
Distal
On a mand 1st PM, the occlusal shape is _________ and the proximal shape is _________.
diamond; rhomboidal
Which is the only posterior tooth with a lingually tilted occlusal table?
Mand 1st PM
T/F: The mand 1st PM has a long central groove.
False
Max 1st PM has long central groove
Mand 1st PM has no central groove - transverse ridge splitting mesial and distal fossae
Which is the most congenitally missing premolar?
Mand 2nd PM
T/F: The gingival papilla between the first and second mand PM is the shortest.
True
T/F: The lingual surface of the mand 2nd PM is narrower than the mand 1st PM.
False
Wider M-D
The mand 2nd PM is the only premolar with ____ lobes.
Five
What is the occlusal shape of a mand 2nd PM?
Square
Which occlusal configuration is the most common in mand 2nd PM?
Y - 3 cusps with a single central pit
buccal > ML > DL
What are the two less common occlusal configurations of mand 2nd PM?
H and U
H has shorter central groove
U has crescent shaped central groove
T/F: The buccal cusp of the mand 2nd PM is taller than the lingual cusps.
False
Shorter
Which root is likely to have its apex closest to the mental foramen?
Mand 2nd PM
Of the two mand premolars, which has the longer root?
Mand 2nd PM
