Premolars Flashcards
which premolar has facial HoC that is close to CEJ?
Mand 1P
Typically, is the mesial or distal marginal ridge more occlusal?
Mesial
All premolars MD vs FL dimension
Wider FL than MD
Where are proximal contacts of all premolars located relative to buccolingual midline?
Located toward buccal
*Leads to larger lingual embrasure space
What premolar has triangular ridges that do not create an oblique ridge?
Three cusp type mand PM
Which premolars have less prominent buccal ridge
Mandibular P
Which premolars are closer to having a square outline?
Mand P
Which maxillary P has broader shoulders and a thinner neck?
Max 1P
Maxillary Premolar contacts
M: O/M junction
D: Middle third
What is unique about the max 1P cusp ridges
Mesial CR is longer than distal
*Only other tooth is primary max canine
Buccal ridge more prominent on which max P
Max 1P
Max premolar’s lingual cusp tip location
mesial to midroot axis
Which root is shorter one a max 1P with two roots
lingual
Max premolars proximal outline shape?
trapezoid
Which tooth has crown depression that extends into root
mesial side of max 1P
Location of cusp tips of max 1P w/ two roots
tips centered over roots
What premolars have mesial marginal ridge groove
Max 1P
Which max P has longer central groove?
max 1P
Which max P has more supplemental grooves?
Max 2P
Max premolars occlusal outline shape?
Max 1P: asymmetrical hexagon
*Mesiobuccal cusp ridge comes close to midline
Max 2P: more symmetrical hexagon
Which mand P is longer?
First
Mesial cusp ridge notches more common on which mand P
Mand 1P
Distal cusp ridge notches more common on which mand P
Mand 2 P
Cusp ridge nothces more common on max or mand P
mand
Mand 1P contacts
M: O/M junction or middle
D: Occlusal third
Mand 2P contacts
M:O/M junction
D: Middle third
Lingual cusp of Mand 2P is located
Mesial to midroot axis
If mand 2P has two lingual cusps, which is wider and longer?
ML cusp
Proximal outline shape of mand P
rhomboid
Mand 1P root depressions
Mesial and Distal
Mand 2P root depressions
Distal
Mand 1P occlusal outline shape
Diamond
Mand 1P occlusal table shape
triangular
Mand 2P occlusal outline shape
Two cusp: almost rounded
Three cusp: more square
Mand 2P occlusal table shape
square
Mand 1P-which fossa is bigger?
Distal
Mand 2P w/ two cusp groove shape
U or H
Mand 2P w/ three cusp groove shape
Y
Mand 2P oblique ridges and fossae unique characteristics
only premolar w/ central fossa
Three triangular ridges but none connect so only tooth w/ no transverse/oblique ridge
