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Dental Anatomy > Premolars > Flashcards

Premolars Flashcards

1
Q

Premolars are also called

A

bicusbids

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2
Q

From the buccal view premolars are roughly ____ shaped. (true for all premolars)

A

pentagon

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3
Q

What is present from the tip of the buccal cusp down to cervical line?

A

Buccal ridges

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4
Q

Premolars usually have two cusps, which are …

A

one buccal and one lingual

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5
Q

Which premolar often has 2 lingual cusps?

A

mandibular second premolar

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6
Q

The buccal cusp tip is ____ to the midroot axis.

A

mesial

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7
Q

Exception: in which premolar is the cusp tip distal to the mesial axis?

A

maxillary first premolar

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8
Q

In premolars the mesial cusp ridge of the buccal cusp is ____ than the distal cusp ridge.

A

shorter

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9
Q

Exception: In which premolar is the mesial cusp ridge of the buccal cusp longer than the distal cusp ridge?

A

Maxillary first premolar

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10
Q

(True for all premolars) the mesial cusp ridge of the lingual cusp is ___ than the distal cusp ridge.

A

shorter

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11
Q

(True for all premolars) adjacent marginal ridges tend to be the same height and form _____.

A

occlusal embrasures

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12
Q

(True for all premolars) Triangular ridges from the buccal and lingual cusps meet slightly ___ to the midpoint of the occlusal surface.

A

lingual

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13
Q

(True for all premolars) The ____ triangular ridge is slightly larger.

A

Buccal

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14
Q

(True for all premolars) The ___ separates the two triangular ridges.

A

Central Groove

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15
Q

(True for all premolars) Mesial proximal contacts are near the junction of what two thirds?

A

Junction of the occlusal and middle thirds.

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16
Q

Distal proximal contacts are slightly more _____ in the middle third, than the mesial proximal contact.

A

cervical

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17
Q

Exception: on what premolar may the mesial contact be more cervical than the distal contact?

A

Mandibular first premolar

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18
Q

(True for all premolars) Proximal contacts are _____ to the center buccolingually.

A

buccal

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19
Q

Mesial marginal ridges are more _____ than distal marginal ridges.

A

occlusal

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20
Q

Exception: In which premolar may the distal marginal ridge be more occlusal than the medial marginal ridge?

A

Mandibular first premolar

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21
Q

(True for all premolars) Cusp ridges and marginal ridges for the boundary of what surface?

A

Occlusal surface

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22
Q

(True for all premolars) Cervical lines curve ____ on the buccal and lingual surfaces.

A

apically

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23
Q

(True for all premolars) Cervical lines curve ____ on the proximal surfaces.

A

occlusally

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24
Q

(True for all premolars) Mesial cervical line is ____ than the distal cervical line.

A

more convex

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25
Q

(True for all premolars) Apical third of roots bend ____ more often than _____.

A

distally more often than mesially

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26
Q

(True for all premolars) Lingual cusp is _____ than buccal cusp; more noticeable on first premolars.

A

shorter

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27
Q

Are the maxillary 1st & 2nd or the mandibular 1st & 2nd premolars more similar?

A

maxillary

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28
Q

Which maxillary premolar is larger?

A

maxillary first premolar

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29
Q

Which mandibular premolar is larger?

A

mandibular second premolar

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30
Q

On maxillary premolars lingual cusps are shorter BUT the the 2nd premolar cusps are almost …

A

equal in length

31
Q

Mandibular premolars lingual cusps are relatively much shorter than buccal cusps, especially on the _____ premolar.

A

first

32
Q

Both maxillary premolars have 1 prominent _____ cusp.

A

lingual

33
Q

What premolar may have more than 1 lingual cusp?

A

mandibular second premolar

34
Q

The medial cusp ridge of ____ is the shortest.

A

the lingual cusp

35
Q

Lingual cusp tips are offset to the ____

A

mesial

36
Q

____ premolar crowns are more in line with the root axis.

A

maxillary

37
Q

____ premolars crowns tilt to the lingual.

A

Mandibular

38
Q

Maxillary premolars crowns are wider ____

A

buccolingually

39
Q

______ premolars crowns are about the same buccolingually as mesiodistally.

A

mandibular

40
Q

Triangular ridges on _______ premolars have a steeper slope towards the central groove than any other tooth.

A

Maxillary

41
Q

Buccal ridge is more prominent in _____

A

maxillary premolars

42
Q

Buccal cusp tip is located more to the ____ in the maxillary first premolar. (only premolar with buccal cusp offset to the _____)

A

distal

43
Q

Both buccal and lingual cusp tips are located slightly to the mesial on this premolar

A

Maxillary 2nd premolar

44
Q

Mesial cusp ridge of the buccal cusp is longer than the distal cusp ridge; only tooth with a longer mesial cusp ridge than distal.

A

Maxillary 1st premolar

45
Q

Mesial cusp ridge of buccal cusp is shorter than the distal cusp ridge.

A

Maxillary 2nd premolar

46
Q

In what maxillary premolar is the crown wider and longer, and the buccal cusp more pointed?

A

maxillary 1st premolar

47
Q

_____ cusp is rounded and blunt for both maxillary premolars.

A

lingual

48
Q

____ cusp is pointed for both maxillary premolars

A

buccal

49
Q

Maxillary 1st premolar almost always has what distinguishing trait?

A

mesial marginal ridge groove

50
Q

The maxillary 1st premolar is the only premolar with ….

A

mesial crown concavity (development depression)

51
Q

In which maxillary premolar is the central groove from mesial to distal pit 1/3 or less in length compared to the other?

A

Maxillary 2nd premolar

52
Q

In which maxillary premolar is the mesial and distal pits closer to the marginal ridges; marginal ridges are thin?

A

maxillary 1st premolar

53
Q

In which maxillary premolar are the marginal ridges relatively wide/thick M-D?

A

maxillary 2nd premolar

54
Q

May have several supplemental grooves giving the occlusal surface a “wrinkled” look.

A

maxillary 2nd premolar

55
Q

Occlusal outline is very angular on the buccal.

A

maxillary 1st premolar

56
Q

Occlusal table is more rounded.

A

maxillary 2nd premolar

57
Q

Buccal line angles are the sharpest in the entire mouth.

A

Maxillary 1st premolar

58
Q

MAxillary 1st premolar crown has definite tape ( ______) to lingual.

A

convergence

59
Q

Only premolar with divided (bifurcated) root and at least 2 canals

A

Maxillary 1st premolar

60
Q

May have 2 cusps or 3 cusps.

A

mandibular 2nd premolar

61
Q

On the mandibular 1st premolar, mesial half resembles canine, distal half resembles premolar; this is called?

A

transition form

62
Q

When there are 3 cusps, there is no ____

A

transverse ridge

63
Q

Premolar most likely to be congenitally missing?

A

Mandibular 2nd premolar

64
Q

Buccal cusp tip is over center of the root.

A

Mandibular 1st premolar

65
Q

Mandibular 2nd premolar, buccal cusp tip is slightly ____

A

mesial

66
Q

Mandibular 1st premolar mesial contact may be more _____ than distal contact.

A

cervical

67
Q

Mandibular 2nd premolar mesial contact is more _____ than distal (general rue for most teeth)

A

occlusal

68
Q

Lingual cusp is very small and non-functional

A

Mandibular 1st premolar

69
Q

Mandibular 2nd premolar lingual cusp is positioned to the ____ when there is 1 lingual cusp

A

mesial

70
Q

Mesiolingual groove separates mesial marginal ridge from the lingual cusp; only tooth with a mesiolingual groove.

A

mandibular 1st premolar

71
Q

Entire buccal profile is visible from the lingual.

A

mandibular 1st premolar

72
Q

The mesial marginal ridge slopes servilely toward the lingual (45 degrees)

A

mandibular 1st premolar

73
Q

Mesial marginal ridge is more horizontal

A

mandibular 2nd premolar

74
Q

Central groove is offset to the lingual

A

true for both mandibular premolars

Dental Anatomy (4 decks)

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