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DAM 1001 > Pre-Molars > Flashcards

Pre-Molars Flashcards

1
Q

What are the pre-molar #

A

4,5,12,13,20,21,28,29

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2
Q

Function of premolars include

A
  1. Mastication; help molars
  2. Maintain vertical dimesion of face
  3. Assit canines in cutting
  4. Support cheeks and corners of mout
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3
Q

Dimesion from the Bottom of the nose to the tip of the chin.

A

Vertical DImersion of Occlusion

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4
Q

How many lobes do PM have?

A

3 facial lobes, 1 lingual

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5
Q

PM

What tooth is the exception to cusp?

A

Mandibular 2nd PM can have 3 cusps (2 lingual)= 5 lobes instead of 4.

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6
Q

Facial proportion of pre-molars is formed by what?

A

Their 3 lobes; center buccal ridge, much shorter crown than canine.

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7
Q

All PM crowns taper where?

A

Cervically.

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8
Q

All PM roots taper where?

A

Apically

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9
Q

Pre molars have _____ marginal ridge expect what PM what is the diffrences?

A

Horizontal marginal ridges, but mandibular 1st PM have more verticel (45 degree) MMR

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10
Q

First premolar crowns are slightly ___ than second premolars.

A

Longer

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11
Q

____ of second premolars are slightly longer than first premolars.

A

Roots; 2nd PM longer.

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12
Q

Roots on maxillary premolars are considerably shorter than on ____ but similar in length to maxillary incisor roots.

A

Maxillary canines (much longer roots)

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13
Q

Roots on mandibular premolars are also shorter than on ____ , but longer than on mandibular incisors.

A

Mandibular canines (longer roots)

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14
Q

On PM, the ____ height of conture is more occlusal than on anteriors that have it much more cervicle at the cingulum.

A

Lingual more occlusal

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15
Q

Proximal contacts on PM are more what than on anterior?

A

More cerivcal and broader.

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16
Q

All pre molars except which have a crown that is narrower on the lingual?

A

3 cups mandibular 2nd PM

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17
Q

Tip of the PM lingual cusp is slightly mesial, Except on which?

A

Mandibular 1st Pm. Lingual cusp is centered.

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18
Q

On all PM, the MMR is more occlusal (cant see past it) than the distal, EXCEPT?

A

Mandibular 1st PM cause of that 45 degree marginal ridge.

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19
Q

Proportionally, on PM, what is wider FL or MD?

A

FL is wider.

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20
Q

Where are the proximal contacts located? How does this affect the emasures?

A

Contacts located BL midline, this makes lingual embasure much bigger.

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21
Q

How many cusp ridges to PM have? What can be the excepetion?

A

All but 3 cusped mandibular 2nd pm (2 lingual ridges, 1 buccal) have 1 buccal and 1 lingual cusp ridge that form a transverse ridge.

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22
Q

The transverse ridge on the mandibular first pre molar seperates what?

A

Mesial and distal fossa!

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23
Q

All pre-molars have a more ___ contact, how does this afffect size of embasure?

A

More buccal contact= large lingual embasures= better to put wedge in the lingual!

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24
Q

Mandibular crowns tilt in what direction? Maxillarys are ?

A

Lingual tilt= mand
Straight= max

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25
Q

On Maxillary 2nd PM what are cusp size comparison?

A

Minimal size diffrence.

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26
Q

On all but maxillary 2nd PM the buccal cups is what compared to the lingual?

A

Larger and tips to the distal

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27
Q

On maxillary 1st PM the buccal ridge is?

A

More prominant

Maxillary vs mandibular

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28
Q

WHat arch or PM

The occlusal table is oblong/ rectangular
WIider FL than MD

A

Maxillary PM

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29
Q

What arch PM?

The occlusal table is equal dimension
same FL than MD

A

Mandibular PM

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30
Q

What maxillary PM?

  • Larger overall.
  • More pointed cusps
A

Maxillary 1st

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31
Q

Where are mesial and distal contacts located on Maxillary Pre-molars?

A

Both in middle third (distal is more cerviical)

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32
Q

What Max PM?

Buccal cusp is more distal from a buccal view, b/c mesial cusp ridge is shorter.

A

Max 2nd PM

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33
Q

What Max PM?

Buccal cusp is distal to axis, from a buccal view

A

Max 1st PM

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34
Q

What Max PM?

Buccal cusp ridge is more prominant, due to following prominant labial ridge on canine.

A

1st Max PM

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35
Q

What Max PM?

More often bifrucated

A

Max 1st

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36
Q

Compare Maxillar PM cusp sizes

A

1st= buccal cusp much bigger
2nd= pretty similar cusp size, more even. Buccal still a little bit bigger.

37
Q

On which maxillary PM is lingual cusp relativley sharper?

A

Maxillary second PM

38
Q

On both max PM, the MMR is what?

A

MMR = more occlusal!

39
Q

On maxilary 1st PRe molars, the mesial cusp ridge is what?

A

Mesial cusp ridge is Longer than the distal cusp ridge.

40
Q

Maxillary 1st PM have what very distinguishing trait?

A

Mesial crown concavity!

41
Q

On Max PM the facial height of conture is where?

A

Cervical 3rd like all theeth.

42
Q

On Maxillary PM the lingual height of conture is where?

A

Middle 3rd like posterior teeth!

43
Q

Only tooth with more pronounced mesial root depression that distal? + what?

A

Max 1st PM
mesial root depression + mesial crown concavity

44
Q

What maxillary PM has a logner central groove?

A

Maxillary 1st PM

45
Q

WHat maxillary PM has a shorter central groove but more supplementaal grooves?

A

Max 2nd PM

46
Q

On maxillary 1st PM, if these feature is presentm it makes the central groove look even longer. What is it?

A

Mesial Marginal groove, looks like it falls off side

47
Q

What maxillary PM is more assymetrical ?

A

Max 1st

48
Q

Where are the contacts on Maxillary PM located?

A

Both are more buccal, but distal is even farther out. = small buccal embasure

49
Q

The Mandibular 1st pre-molar has a ____ and ____ buccal cusp that the 2nd

A

Longer And Sharper Buccal cusp (1st)

50
Q

On **mandibular 2nd pre molars, **the buccal ridge depressions when present are more common where?

A

Distal cusp ridge notch more common

51
Q

The location of proximal contact area on the 2nd mandibular pre molars are where?

A

Both on incisal 3rd, mesial is more occlusal, distal more cervical.

52
Q

An exception to the rule, mandibular 1st pre molar contacts are where, and why?

A

The mesial contact is much more cervical, distal contact is more occlusal. This is due to how veritcle the MMR on the 1st PMs are.

53
Q

The roots of madibular PMs trend how?

A

The have a distal root bend at the apex, this is because mandible is shorter.

54
Q

On mandibular 1st pre molars,the buccal ridge depressions when present are more common where?

A

Mesial cusp ridge notch more common

55
Q

Most mandibular PMs taper narrower from ____ to ____ EXCEPT on what, and why?

A

Taper Buccal to lingual, except on 3-cusped mandibular 2nd PMs which have 2 lingual cusps and are therefore; wider on the lingual instead.

56
Q

The lingual cusp of what PM is much shorter than the distal and almost uselfess?

A

Mandibular 1st PM

57
Q

All lingual cusps on PMs tip what way at the midtooth axis?

A

Mesial

58
Q

What cusp on the mandibular 2nd PM (3cusp) is wider and longer than what cusp?

A

ML cus is wider and longer than the DL cusp

mandibular 2nd molar

59
Q

Which is the only premolar to have its mesial marginal ridge more cervical than the distal?

A

Mandibular 1st PM

60
Q

What PM has a Mesio-lingual groove?

A

Mandibular 1st PM

61
Q

Compar the lingual tilt of the Mandibular 1st and 2nd PM?

A

1st PM is much more tilted than the 2nd PM

62
Q

Outline shape from a proximal view of mandibular PM?

A

Rhomboid.

63
Q

Where are the heights of contour on the buccal and lingual of mandibular pre-molars

A

Lingual height of contour is on the middle 3rd
Buccal height of contour is on the cervical 3rd

64
Q

Explain root depression on mandibibular PM

A

Mand 1st PM= depressions on M/D, deeper distal
Mand 2nd PM= none on M, Distal depression

65
Q

From the occlusal view how does mandibular 1st PM compare to Manibular 2nd PM

A

Mand 1st= mesial smaller than distal
Mand 2nd= mesial and distal pretty even

66
Q

Mandibular 1st PMs have a ____ shaped outline, the ____ corner is flat, and the there is more bulk on the ____ half of the crown

A

Mandibular 1st PMs have a dimond shaped outline, the ML-corner is flat, and the there is morebulk on the Distal half of the crown

67
Q

Compare the shapes of the 2 types of mandibular 2nd PM

A

2 cusps= round
3 cusps= squarish

67
Q

Mandibular 1st PM

There are prominat __ __ that seperate the mesial and distal fossae with no ____ ___

A

Prominant transverse ridges, no central groove.

Mand 1st PM

68
Q

ONLY premolar with central fossa/pit

A

3 cusp Mandibular 2nd Pre molar

3 triangular ridges, no transverse.

69
Q

Which PMs

Mesial cusp ridge of the buccal cusp is longer than the distal cusp ridge

A

Max first PM

70
Q

Has a nonfunctioning lingual cusp.

A

Mandibular 1st PM

71
Q

Two premolars that most frequently have a groove crossing the mesial marginal ridge or one groove just lingual to it.

A
  1. Maxillary 1st PM
  2. Mandibular 1st PM
72
Q

Has a depression in the cervical one third of the mesial side of the crown and root.

A

Max 1st PM

73
Q

Maxillary premolar that has the longer sharper buccal cusp.

A

Max 1st PM

74
Q

Largest maxillary premolar

A

Max 1st PM

75
Q

Mandibular premolar with the longest and sharpest buccal cusp.

A

Mandibular 1st PM

76
Q

Maxillary premolar that is most symmetrical (occlusal view).

A

Maxillary 2nd PM

77
Q

Two premolars without a central groove

A
  1. Mandibular first premolar
  2. Mandibular second premolar (three-cusp type)
78
Q

Crowns tipped lingually with respect to the root axis line (proximal view)

A

All mandibular PM

79
Q

From buccal view, crown is tipped distally from the root axis.

A
  1. Mandibular first premolar
  2. Mandibular second premolar (two-cusp type)
  3. Mandibular second premolar (three-cusp type)
80
Q

Mesial marginal ridge is more cervically located than its distal marginal ridge

A

ONLY mandibular 1st PM

81
Q

Has no transverse ridge.

A

3 cusp mandibular 2nd PM

82
Q

Longest central groove

A

Maxillary 1st PM

83
Q

Has two major cusps almost the same size and length.

A

Maxillary 2nd PM

84
Q

Has a central fossa.

A

3 Cusp Mandibular 2nd PM

85
Q

Premolars with only two fossae: both are triangular fossae.

A

Max 1st, 2nd, Mand 2nd

86
Q

Has a central fossa and two triangular fossae.

A

3 cups mandibilar 2nd PM

87
Q

Has a lingual groove

A

3 cups mandibilar 2nd PM

DAM 1001 (13 decks)

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