Premolars Flashcards
All premolars have the same ……. & …….
Max. premolars have greater …… width
dimensions & length
faciolingual diameter
The lingual cusp is more distinct on ……
Max. premolars
The Max. occlusal table is ……., while the Mand. one is ……..
centered faciolingually
lingually displaced
Mand. buccal cusp is more towards the ……
faciolingual midpoint
Max. buccal surface is …… from height of contour to cusp tip, while the Mand. is ……
straight
convex
The Max. buccal height of contour is ……. than that of the Mand., however both are in the …… third
lower
cervical
The Max. lingual height of contour is …… than that of the Mand.
lower
The Max. lingual height of contour is located at ….. & the Mand. lingual height of contour is at …….
the junction of middle and cervical thirds
* upper middle third
Mand. premolars have ……. root cross section, while the Max. have ……..
round
* mesial root concavities
The mesial marginal developmental groove is a feature of …….
Max. first premolar
The Max. first premolar buccal cusp is displaced ………
distally
* The lingual is mesially displaced
The Mand. first premolar features a ……. developmental groove
mesial lingual
The tooth with the greatest discrepancy in size between cusps is ……..
Mand. first premolar
* This tooth resembles canines
The occlusal surface on the Mand. first premolar is ……… slanted
lingually
The premolar that may contain a central pit is ……..
Mand. second premolar
The buccal surface is …… than the lingual surface on the Max. first premolar
wider
* The buccal surface has a trilobed appearance
The Max. first premolar features a mesial concavity that ……….
extends into the mesial root surface, forming mesial intraradicular groove
* The mesial marginal developmental groove is an extension of the central groove, which crosses the mesial marginal ridge
The Max. first premolar occlusal view shows ……. profile, and the occlusal table has an …… shape
hexagonal
trapezoidal (where the mesial and distal surfaces converge towards the lingual)
The Max. second premolar differs from the first in what aspects?
- Smaller & narrow shouldered
- Buccal surface has relatively indistinct lobes
- Mesial marginal ridge not interrupted by a groove
- The cusps are of equal heights (unlike the first), and they are centered in mesiodistal dimension
- Occlusal view shows diamond crown profile, and the occlusal table is rectangular with little lingual convergence
- Less prominent mesial axial concavity
The Mand. first premolar lingual cusp resembles ……..
canine cingulum
The only posterior tooth with lingually inclined occlusal table is ………
Mand. first premolar
The mesial and distal profile of the Mand. first premolar are ………
asymmetric
* There is a prominent mesial bulge
The Mand. first premolar features a …… on the mesiolingual line angle of the tooth
mesiolingual groove (which produces a concavity)
The Mand. first premolar occlusal view shows ………
- a distinct transverse ridge (from the buccal cusp to the lingual cusp)
- The mesial marginal ridge is less distinct than the distal
- Occlusal profile is diamond shaped, with lingual convergence
The Mand. first premolar root is …….
relatively round
The Mand. second premolar features ….. cusps
three (the mesiolingual is larger than the distolingual)
* The lingual cusps are separated by a lingual groove extending from the central pit
The Mand. second premolar buccal and lingual cusps are equal in size. T/F??
true
Occlusal view of the Mand. second premolar shows ……
a square outline, with a central pit, and no transverse ridge
* a “Y” profile for three cusped tooth, and an “H” for two cusped ones
Of all premolars, the roundest root in cross section is ……..
the Mand. second premolar
Unlike the Mand. first premolar, the buccal and lingual surfaces of the Mand. second premolar are …….
equal (not convergent like the first)
