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Dental Anatomy > Mandibular Premolars > Flashcards

Mandibular Premolars Flashcards

1
Q

Buccal ridge prominence maxillary vs mandibular

A

max: more prominent
man: less prominent

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2
Q

distal crown tilt max vs man

A

max: No distal crown tilt relative to the root
man: Distal crown tilt relative to the root

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3
Q

difference between cusp heights max vs man:

A

max: Less difference between F and Li cusp heights (especially seconds)

man: More difference between cusp heights
(especially firsts)

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4
Q

maxillary pre-molars: central groove is ________ over the tooth

A

centered

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5
Q

man premolars: crown tilts to the _________ so buccal cusp tip almost _________ over the root

A

lingual

centered

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6
Q

Max premolar vs. Man premolar:

Crown considerably wider
faciolingually than
mesiodistally

Crown closer to square or
round

A

Maxillary

Mandibular

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7
Q

Man 1st premolar develops from _____ lobes

A

4

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8
Q

Man 2nd premolar develops from _______ lobes

A

5 (3 cusp) or 4 (2 cusp)

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9
Q

Man 1st premolar calcification

A

1.75-2yrs

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10
Q

Man 2nd premolar calcification

A

2.5 yrs

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11
Q

man 1st premolar enamel completion

A

5-6yrs

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12
Q

man 2nd premolar enamel completion

A

6-7yrs

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13
Q

man 1st premolar eruption

A

10-11yrs

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14
Q

man 2nd premolar eruption

A

11-12

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15
Q

man 1st premolar root completed

A

12-13

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16
Q

man 2nd premolar root completed

A

13-14yrs

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17
Q

Man 1st Premolar Cusps:

Li cusp is very small/large almost like a cingulum on a canine

_____ distance is similar to
canine

Mesiobuccal/distobuccal cusp ridge isthe same or slightly shorter than Mesiobuccal/Distobuccal cusp ridge

Large prominent, sharp ____ ______ only part that is in
occlusion. Contributes to
tearing and shearing like a
canine.

A

small

FL

mesiobuccal, distobuccal

Facial cusp

18
Q

Man 2nd Premolar Cusps:

___ cusps, ___ F and ___ well developed Li cusps in first
type. The second type has
____ cusps with __F and ___Li
cusp

More surface area in
________- similar to molar

Larger more prominent
________ ______

Tooth resembles ______
because it has chewing or
grinding efficiency

A

3, 1, 2
2, 1, 1

occlusion

marginal ridges

molar

19
Q

MANDIBULAR 1ST
PREMOLAR – O VIEW:

Resembles small ______

Mesio buccal and disto
buccal line angles are ____
and ____ respectively

Heavy buccal/lingual but small
buccal/lingual triangular ridge

Small/Big occlusal table
______ or ______ in
shape with sharp
convergence to the L

Well developed
______ _______.
Mesial is more cervical
than the distal

Smallest _______/_____
size difference of any
mandibular tooth i.e.
most round

______ posterior
tooth

A

canine

flat, round

buccal, lingual

small, triangular, diamond

marginal ridges

F-L / M-D

smallest

20
Q

MANDIBULAR 1ST
PREMOLAR – F VIEW:

Well developed ____ _____ that results in large prominent
pointed buccal cusp and buccal ridge

where is the F cusp located?

mesial/distal cusp ridges are the same or slightly shorter than the mesial/distal cusp ridges

contact areas are higher on the mesial/distal than the mesial/distal

Curvatures of the cervical line
on the mesial and distal are
similar/different

A

middle lobe

F cusp is centered or slightly
mesial over the root

mesial, distal

distal, mesial

similar

21
Q

MANDIBULAR 1ST
PREMOLAR – Li VIEW:

Prominent _______ _____
in the center lingual area

Due to ____ ______ most of the occlusal surface of crown is visible

Contact areas and marginal
ridges are ________

_________ groove is
present. Line of demarcation
between:

Root is more narrow on the
Buccal/Lingual

A

transverse ridge

lingual taper

pronounced

Mesiolingual, mesial buccal lobe and lingual lobe

lingual

22
Q

MANDIBULAR 1ST
PREMOLAR – M VIEW:

F cusp is _____ over the
root

Crown is tipped to the
______

Prominent ______ ______
is visible

Small ____ cusp

Lingual height of contour is
in the ________ and facial
height of contour is in the
________

Strong prominent middle
_____

_____ ______ Groove

A

centered

lingual

transverse ridge

lingual

middle 1/3, cervical 1/3

lobe

mesio lingual

23
Q

MANDIBULAR 1ST
PREMOLAR – D VIEW:

Crown tipped to the _______

Li height of contour is in
_______

Facial height of contour is
in ________

mesial/distal marginal ridge is
higher and flatter than
mesial/distal marginal ridge

No ________ ______

Distal root more convex/concave

A

lingual

middle 1/3

cervical third

distal, mesial

developmental groove

concave

24
Q

two common forms of Man 2nd premolar:

3 cusp premolars appear more ______

2 cusp premolar appears ore ________

A

angular

rounded

25
Q

Mandibular 2nd Premolar O
View:

____ cusp is the largest of
the two lingual cusps

This tooth is the only
premolar with a:

Marginal ridges are fairly
_______ and _____

Central pit and “___” shaped.
Central pit is slightly
towards the mesial/distal.

Occlusal table is _____

what are the 3 developmental grooves?

Central pit is midway
between:

Central pit is generally ___ to
Mesial and Distal pits

A

ML

lingual groove

prominent, even

y, distal

square

Mesial developmental, Distal
developmental, and Lingual developmental grooves

between the F cusp tip and
the Li surface

Li

26
Q

MANDIBULAR 2nd
PREMOLAR – F VIEW:

Buccal cusp is shorter/longer. The cusp angle between the
cusp ridges is more acute/obtuse

_____ ________ contact
areas

Root is broader M-D/F-L and
root ends in an apex that is
sharp/blunt

A

shorter

obtuse

broad, symmetrical

M-D

blunt

27
Q

MANDIBULAR 2nd
PREMOLAR – Li VIEW:

Li cusps are shorter/longer than the Li cusp on the first
premolar. Less of the
______ cusp is seen

ML/DL cusp is larger than the
ML/DL cusp

A Lingual _____ is present
and runs a short distance

Less root _________
Buccal to Lingual than in
first premolar

A

longer, buccal

ML, DL

groove

convergence

28
Q

MANDIBULAR 2nd
PREMOLAR – M VIEW:

Tooth is wider __________ than 1st premolar

______ cusp is not as centered over the root and is shorter

Marginal ridge is at _____
angles to the long axis of
tooth

More/Less occlusal surface can
be seen

Slightly shorter/longer but sharper/blunter root

A

bucco lingually

facial

right

Less

longer, blunter

29
Q

MANDIBULAR 2nd
PREMOLAR – D VIEW:

More/Less occlusal surface can be seen

Distal marginal ridge is at a
level lower than the M
marginal ridge

A

More

30
Q

MANDIBULAR 2nd
PREMOLAR – 2 cusp type

height relationship between 2 cusps:

Is there a lingual groove?

A

Li cusp is same height

no, but there is a slight depression on the disto lingual

31
Q

Mandibular 2nd Premolar
2 cusp type O:

The two cusp tooth is more
______ on the lingual than
the more square 3 cusp

Well developed ___ cusp
opposite the ____ cusp

A

rounded

Lingual, facial

32
Q

How to tell between right and left man 1st premolars

A

flat mesio-lingual line angle

mesiolingual groove on the occlusal surface

mesial pit closest to cusp ridge

33
Q

1st premolar vs canine:

premolar has ____ cusps

premolar has two distinct ____

premolar has a distinct ______ groove

A

2

pits

mesio-lingual

34
Q

1st molars vs 2nd pre-molars

similar flat type broad ______ table

blunted ______ cusps

marginal ridges are similar_____ and _______

A

occlusal

broad

size, position

35
Q

what is the 3rd most common impacted or congenitally missing tooth behind 3rd molars and Maxillary lateral incisors

A

mandibular 2nd premolar

36
Q

the _______ molars must maintain the space for the permanent premolars to erupt

A

primary

37
Q

Primary ____ molar maintains the space by keeping the permanent first molar
from drifting forward

A

2nd

38
Q

The primary molars have larger M-D width than the mandibular premolars.
When the mandibular premolars come in the first molar moves ________

A

forward

39
Q

Posterior teeth fracture
incidence:

Most common are _____ _______ specifically
the ______ cusps

b. Second most common are ______ _______ but in
some studies are the most common. Most commonly fractured are ________ and
________ cusps

c. Third are the ______ ________. For these, the _______ cusp is most commonly fractured
d. _____ ________ are least commonly fractured

A

mandibular molars, lingual

maxillary molars, mesiofacial, distolingual

maxillary premolars, buccal

mandibular premolars

40
Q

Mandibular Premolar
Fracture Incidence:

mandibular molars:

maxillary molars:

maxillary premolars:

mandibular premolars:

other:

A

48%

28%

16%

6%

2%

Dental Anatomy (5 decks)

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