Maxillary 2nd Premolar Flashcards
calcifies
2yrs
erupts
10-12yrs
root completion
12-14yrs
Comparisons with mx 1st premolar
-more rounded/less angular
-more variations in crown size
-buccal and lingual cusps closer to same height
-no mesial concavity
-usually single rooted
-mesiobuccal cusp ridge is shorter than distobuccal cusp ridge
Facial view: facial cusp
not as long and more rounded
*less crown taper
Facial view: height of contour
cervical 3rd
Lingual view: lingual cusp is offset to the…
mesial
Lingual view: the lingual cusp is relatively…
sharp
Lingual view: height of contour
cervical 3rd
Proximal view: both cusp tips are about _____ in length
equal; lingual can be slightly shorter
Mesial view: there is no mesial concavity so the crown is ____; there is also ___ mesial marginal groove
convex; NO
Occlusal view: the crown outline is shaped more…
ovoid (rounded)
Occlusal view: compared to 1st PM there is ____ distance between the cusps
more
Occlusal view: the lingual cusp is almost as _____ as the buccal cusp
wide
Occlusal view: compared to 1st premolars, describe the transverse ridge and fossa
less distinct ridge; fossa closer to center
Occlusal view: grooves
-more irregular central grooves (shorter and shallower)
-more supplementary grooves present (more wrinkled appearance)
-no mesial marginal groove
Compared to 1st premolars, the root is…
almost equal or slightly longer and not as prominent
The depression on the ______ is often deeper
*distal
the root often has a _____ inclination
distal
Usually single rooted with ____ canal
1 canal, can have 2 (40%)
if 2, usually join to single apical foramen
2 pulp horns
*can have 2 roots w/ 2 canals
