Premolars Flashcards
succedaneous teeth
teeth that erupt in positions previously occupied by deciduous teeth
function of first premolars
-assist in shearing/ cutting food
-support corners of mouth
-function is mastication of food
-maintain vertical dimension b/w nose and chin
developmental lobes of premolar
3 on buccal surface
-caused by 2 shallow depressions
maxillary premolars are more oblong in which dimension
buccolingual longer than mesiodistal
maxillary first premolar is (facial)
the widest premolar
on a max 1st premolar, which cusp ridge is longer
mesial is longer than distal
on a max 1st premolar, the buccal cusp tip is _____ of the root axis line
distal
max 2nd premolar cusp tip is offset
to the mesial
on a max 2nd premolar, the mesial cusp ridge is ______ than the distal cusp ridge
shorter (opposite of 1st max premolar)
max 1st premolar has how many roots
most likely 2 but can have 1
max 2nd premolar has how many roots
1 root
max 1st premolar (lingual)
crown and root narrower
which root is shorter on lingual side
lingual root is shorter than buccal root
which cusp is shorter on max 1st premolar
lingual cusp
max 2nd premolar has a lingual cusp _______ than the lingual cusp on max 1st premolar
longer
lingual cusp tip on 2nd max premolar is offset ____
mesial
the max 1st premolar has a prominent ___________ on the proximal surface
mesial concavity
on a max 1st premolar, proximal view, which cusp tip is longer
buccal cusp is longer than lingual
what feature is visible on a proximal view on a max 1st premolar
mesial marginal ridge groove
max first premolar is brittle because ……
-mesial marginal groove
-mesial concavity
-2 spindly roots
what is the function of a robust canine
to protect the weaker premolar
max 2nd premolar has no what compared to 1st max premolar (proximal)
-no mesial concavity
-no mesial marginal ridge groove
compare the buccal and lingual cusp tip lengths on a max 2nd premolar looking proximally
they are nearly equal in length
triangular ridge
any ridge that descends from the cusp tip towards central groove
inclined plane
the sloping area found between 2 cusp ridges
developmental groove
linear line between parts of teeth
transverse ridge
union of 2 triangular ridges crossing transversely
looking occlusal on a max 1st premolar, the lingual cusp is offset
mesial
central groove
runs mesiodistal, crosses transverse ridge, ends in pits of triangular fossa
which groove is only visible in max 1st premolars
mesial marginal ridge groove,
-makes central groove appear longer
on occlusal, max 2nd premolar, central groove is ________
shorter and more irregular than max 1st premolar
on a max 2nd premolar, occlusally, the lingual cusp tip is offset _______
mesial
which max premolar has a more prominent buccal ridge
1st max premolar
which max premolar is more asymmetrical
1st max is more assymetrical
which max premolar has a longer central groove
1st max premolar
which max premolar has more supplemental supplemental grooves
2nd max premolar
mand premolars are generally ________ than max premoalrs
less alike
when viewed proximally, mand premolar crowns appear to be tilted to ______
lingual
on mand premolars which cusps are larger looking proximally
buccal cusp larger than lingual cusp
all premolars (max and mand) have greater _______ than _______
buccolingual length than mesiodistal length
mand premolars are shaped like ______ looking occclusal
squares
mand 1st premolar looks like a ______ while mand 2nd premolar looks like a ______
canine, molar
mand 1st premolars have a cusp tip ______ of the midline (buccal)
mesial
on a mand 1st premolar, the ______ contact area is more cervical than the _______
mesial more cervical than distal
-ONLY TOOTH WITH THIS FEATURE
mand 1st premolars have buccal cusps ______ than mand 2nd
sharper (bc they resemble canines)
the mand 1st premolars have ______ lingual cusp
miniscule, small
one mand 1st premolar looking lingual, you can see the entire _______
occlusal surface
notable hallmarks in mand 1st premolar
mesiolingual developmental groove and prominent transverse ridge
looking lingually, the mand 1st premolar has its mesial marginal ridge more _____ than distal marginal ridge
cervical
-ONLY PREMOLAR TO HAVE THIS
mand 1st premolars, mesial, tip of buccal is _____ over the root and the lingual is in ______ over the border of the root
centered over the root, in line with border of root
1st mand premolar crowns have a greater ______ than the 2nd premolar
tilt
outlines of mand premolar crowns are
rhomboid
the crest of curvature (HOC) is on the _______ on the mand 1st premolar
on the middle third
mesial, the root of a 1st mand premolar has a ______ root with a _____
short, deep developmental groove
distal, the mand 1st premolar has no ______
developmental groove
on a first mand premolar, occlusal, what takes up the bulk of the tooth
middle labial lobe
mand first premolar has more _____ in distal half than mesial half, occlusal
bulk
mand 1st premolar, occlusal, has a mesiolingual corner that is _____
flat
mand 2nd premolar has 2 forms
3 cusp type (more common) and 2 cusp type
mand 2nd premolar is _____ than 1st premolar and has a ______ root
larger, longer
mand 2nd premolar has a buccal cusp ______ than 1st premolar
shorter, more blunt
on a mand 2nd premolar, the mesiolingual lingual cusp is _______ and _____ than the distolingual cusp
wider and larger
on a 2nd mand premolar, the cusp tip lingually is _______ to root axis line
mesial
what separates 2 lingual cusps
lingual groove
on a mand 2nd premolar, the marginal ridge is _________ compared to 1st premolar
more horizontal
on a mand 2nd premolar, there is no
ML developmental groove
on a 2nd mand premolar, distally, the crown is tipped
distally
on a mand 2nd premolar (3 cusp type) rank the shapes of the cusps)
buccal>mesiolingula>distolingual
what is the only premolar with a central fossa
mand 2nd premolar (3 cusp type) due to Y shape
on a mand 2nd premolar (2 cusp type) the central development groove is
crescent shaped
groove pattern on a mand 2nd premolar (2 cusp type) can have what shapes
U and H
