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Restorative Dentistry > Permanent Premolars Anatomy > Flashcards

Permanent Premolars Anatomy Flashcards

1
Q

Numbers of premolars

A

Max = # 4, 5, 12, 13
Mand = # 20, 21, 28, 29

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2
Q

Permanent premolars take the place of _____ and are therefore ______ teeth

A

Deciduous molars
Succedaneous

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3
Q

The first premolars assist :

A

The canines in shearing or cutting food morsels

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4
Q

All upper and lower premolars….

A

Support corners of mouth and cheeks to keep them from sagging
Function with molars to masticate foods and maintain the vertical dimension of the face between the nose and the chin

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5
Q

The buccal surfaces of all premolars develop from ________ facial lobes evidenced by _______, ______ depressions separating the buccaneers ridge of the facial surface of the crown from the mesial and distal portions

A

3, 2, vertical

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6
Q

The lingual surfaces of most premolars develop from ____ lingual lobe
In premolars, this forms ___ lingual cusp

A

One, one

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7
Q

When compared to mandibular premolars, max 1st and 2nd premolars :

A

Are much more alike
Have buccal and lingual cusps that are nearly equal in size
Are more oblong in the B-L dimension

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8
Q

Which is the widest premolar?

A

Max 1st

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9
Q

On the buccal cusp of the max 1st premolar, the mesial cusp ridge is ___ than the distal cusp ridge
This is unique to this permanent tooth and _____

A

Longer
Primary canines

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10
Q

On the max 1st PM, the buccal cusp tip is placed _____ of the RAL

A

Slightly distal

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11
Q

On the max 2nd PM, the cusp tip is set to the ___
Mesial cusp ridge is _____ than distal

A

Mesial
Shorter

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12
Q

_______ (max/mand; 1st/2nd) PM is more likely to have two roots

A

Max 1st

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13
Q

On the max 1st PM, the lingual cusp is _____ and bends towards the ______
The lingual root is ____ than buccal root

A

Shorter, mesial
Shorter

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14
Q

On max 2nd PM from a facial view, the lingual cusp is _____ than the lingual cusp of 1st meaning that the cusps are _____
The lingual cusp is offset to the ___

A

Longer, more nearly equal in size
Mesial

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15
Q

On max 1st PM, there is a prominent ______ located ___ to the contact area

A

Mesial concavity, cervical

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16
Q

From a proximal view of the max 1st PM, the _____ cusp is noticeably longer than the _____ cusp

A

Buccal, lingual

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17
Q

On the max 1st PM, what is always present in the proximal view?

A

Mesial marginal ridge groove

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18
Q

The max 1st premolar is considered very brittle because:

How does this relate to the canine?

A

Mesial marginal groove, mesial concavity, two spindly roots

Robust canine to protect weaker premolar

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19
Q

The max 2nd PM from the proximal view has ____ root, no _______, no_____, and buccal and lingual cusps ______

A

1, mesial concavity, mesial marginal groove, nearly equal in size

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20
Q

A triangular ridge is any ridge that

A

Descends rom the cusp tip of a posterior tooth towards the central part of the occlusal surface

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21
Q

A transverse ridge is

A

The unions of two triangular ridges crossing transversely across the surface of a posterior tooth

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22
Q

An inclined plane is

A

The sloping area found between two cusp ridges

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23
Q

The max 1st PM from an occlusal view has a lingual cusp offset to the _____
A long central developmental groove that runs ______, crosses transverse ridge and ends in ______ in the triangular fossae

A

Mesial
Mesiodistally
Pits

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24
Q

The mesial marginal ridge groove on the max 1st premolars makes the central groove appear

A

Longer

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25
Q

In comparison to the max 1st PM, the max 2nd PM has a central groove that is _______
Line angles that are ______
Lingual cusp offset to the_____ (as much, not?)
Does this tooth have a mesial marginal groove?

A

Shorter and more irregular
More rounded
Mesial, not as much
NO

26
Q

Buccal ridge is more prominent on the ______ max PM than the ___

A

1st, 2nd

27
Q

Max 1st PM outline is _____ than the 2nd PM

A

More asymmetrical

28
Q

Length of the central groove of max _____ PM is longer than on the ____

A

1st, 2nd

29
Q

Does the max 1st or 2nd PM have more supplemental grooves?

A

2nd

30
Q

Do the mand or max PM vary more in shape?

A

Mand

31
Q

The crown on the mand PM appears to be _____ form a proximal view

A

Tilted o the lingual

32
Q

“Buccal cusp larger than lingual”
More so on mand or max PM?

A

mand

33
Q

(Mand/max)_______ PM closer to square shape

A

Mand

34
Q

All premolars have ______ width greater than _______

A

Buccolingual, mesiodistal

35
Q

Mand 1st PM has characteristics of _____
Mand 2nd PM has characteristics of ____

A

Canine
Molar

36
Q

On which tooth is the mesial contact area more cervical than distal ??? *****only 1

A

Mand 1st PM

37
Q

On mand 1st PM, the cusp tip is _____ to the midline

A

Slightly mesial

38
Q

Buccal cusps on which mand PM are sharper?

A

1st

39
Q

What is the hallmark of the mand 1st PM?

A

Mesiolingual developmental groove and prominent transverse ridge

40
Q

From the lingual view of the mand 1st PM, what can be seen?

A

Entire occlusal surface
Most of mesial distal surfaces

41
Q

What is the only premolar & posterior tooth to have a mesial marginal ridge more cervically located than its distal marginal ridge?

A

Mand 1st

42
Q

The buccal cusp tip on mand 1st PM is ______ over root
Tip of lingual cusp is ____ with lingual border of the root

A

Centered
In line

43
Q

On which mand PM does the crown tip more lingually?

A

1st

44
Q

The root on the mand 1st PM is

A

Short but often has a deep developmental groove ON MESIAL

45
Q

From a proximal view, which ridge is more occlusal on the mand 1st PM?

A

Distal marginal ridge

46
Q

Which surface makes up the bulk of the occlusal view on the mand 1st PM?

A

Buccal

47
Q

The mand 1st PM has more bulk in the distal or mesial half?

A

Distal

48
Q

Which mand PM is larger? Which has a longer root?

A

2nd, 2nd

49
Q

Which PM can exist as either a 2 or 3 cusp type ?
Which type occurs more often?

A

Mand 2nd PM
3 cusp

50
Q

The buccal cusp tip is more blunt on which mand PM?

A

2nd

51
Q

When the mand 2nd PM has 2 lingual cusps, which is wider and longer?

A

Mesiolingual

52
Q

Does the mand 2nd PM have a ML developmental groove?
Does the 1st?

A

No
Yes

53
Q

Marginal ridges (from M aspect) on the ____ mand PM is more horizontal than the ____

A

2nd, 1st

54
Q

From a distal aspect on a 3cusp type mand 2nd PM, how many cusps are visible?
The crown is tipped _____ so that more of the ______ surface is seen from the _____ than _____

A

All 3
Distally, occlusal, distal, mesial

55
Q

What is the shape of the 3 cusp mand 2nd PM? (O)
What shape do the developmental grooves from on occlusal surface ?

A

Square
Y* shaped

56
Q

Which PM is the only one with a central fossa?

A

3 cusp mand 2nd PM

57
Q

What is the shape of the 2 cusp type mand 2nd PM? (O)
What is the shape of the central groove?

A

Round with some lingual convergent on M/D
Crescent shaped ( convex towards L)

58
Q

Groove patterns on the 2 cusp mand 2nd PM can be

A

H or U* shaped

59
Q

Does the 2 cusp mand 2nd PM have a lingual groove?

A

No

60
Q

What is the shape of the max 1st PM (O)?

A

Hexagonal

Restorative Dentistry (11 decks)

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