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Mandibular 1st Premolars (Ye's Version) Flashcards

1
Q

Mandibular Left 1st premolar tooth #?

A

21

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2
Q

Mandibular Right 1st premolar tooth #?

A

28

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3
Q

Mandibular 1st premolars: Chronological Events

First evidence of calcification:
Enamel completed (crown completion):
Eruption:
Root completion:

A

First evidence of calcification: 1.75-2 yrs
Enamel completed (crown completion): 5-6 yrs
Eruption: 10-12 yrs
Root completion: 12-13 yrs

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4
Q

Mandibular 1st premolars:

How many lobes?

A

4 lobes

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5
Q

Mandibular 1st premolars:

How many buccal vs lingual?

A

3 buccal vs 1 lingual

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6
Q

Mandibular 1st premolars:

What are the buccal lobes?

A
  1. MB
  2. Midbuccal
  3. DB
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7
Q

Mandibular 1st premolars:

What’s the lingual lobe?

A

The lingual lobe

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8
Q

Mandibular 1st premolars: General Characteristics

Have a well developed _______ cusp and small ________ cusp.

A

Well developed - Buccal cusp

Small - linugal cusp

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9
Q

Mandibular 1st premolars: General Characteristics

Resemble small _________

A

Canines

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10
Q

Mandibular 1st premolars: General Characteristics

Are they smaller or larger than maxillary 2nd premolars?

A

SMALLER (opposite is true for the maxillary arch)

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11
Q

Mandibular 1st premolars: General Characteristics

Are they succedaneous teeth? If so, what do they replace?

A

YES: replace mandibular 1st MOLARS

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12
Q

Mandibular 1st premolars: General Characteristics

How many roots do they have?

A

Single root

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13
Q

Mandibular 1st premolars: Buccal view

___________ in shape.

A

Trapezoidal

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14
Q

Mandibular 1st premolars: Buccal view

The __________ lobe is well-developed with a prominent bucal ridge and a buccal cusp that resembles the _______ ________ (tooth type and arch) but the cusp tip is MORE rounded.

A

Midbuccal lobe

Mandibular canine

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15
Q

Mandibular 1st premolars: Buccal view

The mesial slope (cusp arm) of the buccal cusp is (shorter/longer) than the distal slope.

A

Shorter

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16
Q

Mandibular 1st premolars: Buccal view

The buccal surface is more ________ (convex/concave) than in the maxillary premolars especially in the cervical 1/3. There are _________ _________ between lobes.

A

Convex; developmental depressions

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17
Q

Mandibular 1st premolars: Buccal view

The _________ outline is straight/slightly concave above the cervical line.

A

Mesial

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18
Q

Mandibular 1st premolars: Buccal view

The _________ outline is slightly concave above the cervical line.

A

Distal

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19
Q

Mandibular 1st premolars: Buccal view

The mesial and distal heights of contour (HOC) are located in the __________

A

Middle 1/3

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20
Q

Mandibular 1st premolars: Buccal view

The cervix is much (narrower/broader) ______ M-D than the crown width at the contact points

A

Narrower

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21
Q

Mandibular 1st premolars: Buccal view

The cervical line exhibits slight curvature (T/F)

A

True

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22
Q

Mandibular 1st premolars: Lingual view

Both the crown and the root taper markedly toward the lingual. Therefore the ________ and _______ surfaces are visible from the lingual.

A

Mesial and Distal

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23
Q

Mandibular 1st premolars: Lingual view

The __________ cusp is small, it resembles the _________ of a canine.

A

Lingual; cingulum

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24
Q

Mandibular 1st premolars: Lingual view

The occlusal surface slopes ____________ (buccally/lingually) in a cervical direction. Therefore, the occlusal surface is (not/is visible) from the lingual view?

A

Lingually; IS visible

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25
Q

Mandibular 1st premolars: Lingual view

There are concavities between the ________ line and the contact areas on the ________ portion of the mesial and distal surfaces.

A

Cervical line

Lingual portion

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26
Q

Mandibular 1st premolars: Lingual view

The mesial and distal outlines are _______ (convex/concave) from the CEJ to the contact areas.

A

Concave

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27
Q

Mandibular 1st premolars: Lingual view

There is a _____________________ which separates the mesial marginal ridge from the lingual cusp.

A

Mesiolingual developmental groove

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28
Q

Mandibular 1st premolars: Lingual view

The mesiolingual developmental groove is a demarcation between the ______ lobe and the ______ lobe.

A

Lingual lobe and MB lobe

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29
Q

Mandibular 1st premolars: Lingual view

The root tapers ________ (which direction?)

A

Lingually

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30
Q

Mandibular 1st premolars: Lingual view

The root appears very ________ when viewed from the lingual.

A

Narrow

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31
Q

Mandibular 1st premolars: Lingual view

The root tapers evenly from the cervix to a pointed apex. Often, ________________ or _____________ can be seen on the root mesially.

A

Developmental depressions or developmental grooves

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32
Q

Mandibular 1st premolars: Mesial view

___________ in outline

A

Rhomboidal

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33
Q

Mandibular 1st premolars: Mesial view

___________ outline is very curved/convex.

34
Q

Mandibular 1st premolars: Mesial view

The buccal cusp tip is ___________ over the root.

35
Q

Mandibular 1st premolars: Mesial view

Buccal height of contour is at the ___________

A

Junction of the middle AND cervical 1/3’s

36
Q

Mandibular 1st premolars: Mesial view

The buccal surface is (concave/convex), especially at the middle and cervical 1/3’s

37
Q

Mandibular 1st premolars: Mesial view

The lingual outline is much (more/less) convex compared to the buccal surface.

38
Q

Mandibular 1st premolars: Mesial view

The lingual height of contour is located in the ___________, lingual to the outline of the root and therefore gives the impression of an overhand above the root trunk.

A

middle 1/3

39
Q

Mandibular 1st premolars: Mesial view

The lingual cusp tip is on a line with the lingual border of the root. Remember that on maxillary posterior teeth, when viewed from the proximal surfaces the cusp tips are within the confines of the ____________

A

Root trunk

40
Q

Mandibular 1st premolars: Mesial view

The distance from the CEJ to the lingual cusp tip is _______ the distance from the CEJ to the buccal cusp tip.

41
Q

Mandibular 1st premolars: Mesial view

The mesial marginal ridge (formed by the ______ lobe) slopes cervically from buccal to lingual.

A

Mesiobuccal

42
Q

Mandibular 1st premolars: Mesial view

The ____________ developmental groove separates the ________________ from the lingual cusp.

A

Mesiolingual; mesial marginal ridge

43
Q

Mandibular 1st premolars: Mesial view

The cervical line curves _________ about 1mm.

A

Occlusally

44
Q

Mandibular 1st premolars: Mesial view

The mesial surface is smoothly convex except for the ______________________

A

Mesiolingual developmental groove

45
Q

Mandibular 1st premolars: Mesial view

The root outline is tapered to a pointed apex. There is a deep __________________ on the mesial surface of the root.

46
Q

Mandibular 1st premolars: Distal view

The distal marginal ridge is _______ (shorter/higher) above the CEJ, cervicooccluslally, than the mesial marginal ridge.

47
Q

Mandibular 1st premolars: Distal view

This is the only tooth in which the mesial marginal ridge is at a (lower/higher) level than the distal marginal ridge.

48
Q

Mandibular 1st premolars: Distal view

The distal marginal ridge does NOT exhibit the extreme _________ slope that the mesial marginal ridge exhibits. Almost at right angles to the long axis of the tooth.

49
Q

Mandibular 1st premolars: Distal view

The distal surface is smoothly _________.

50
Q

Mandibular 1st premolars: Distal view

There may be a concavity above the ________ extending buccolingually.

51
Q

Mandibular 1st premolars: Distal view

The distal contact area is _________ (broader/narrower) than mesial and it is in the middle 1/3 of the tooth buccolinugally.

52
Q

Mandibular 1st premolars: Distal view

The distal height of contour is in the ____________

A

Middle 1/3

53
Q

Mandibular 1st premolars: Distal view

The cervical curvature is less or similar to mesial curvature (T/F)

54
Q

Mandibular 1st premolars: Distal view

The root is more _________ (concave/convex) compared to the mesial aspect.

55
Q

Mandibular 1st premolars: Distal view

There is a shallow __________ on the distal surface of the root but there is NOT a deep developmental groove.

A

Shallow developmental DEPRESSION

56
Q

Mandibular 1st premolars: Occlusal view

There is a lot of variation on the occlusal aspect of this tooth. The most common occlusal outline is __________ shaped.

57
Q

Mandibular 1st premolars: Occlusal view

The buccal cusp and the buccal ridge are pronounced. (T/F)

58
Q

Mandibular 1st premolars: Occlusal view

The _____________ lobe makes up the majority of the occlusal surface.

A

Middle buccal lobe

59
Q

Mandibular 1st premolars: Occlusal view

The lingual cusp is ________ (small/large)

60
Q

Mandibular 1st premolars: Occlusal view

The mesiobuccal cusp ridge is _______ (shorter/taller) than the distobuccal cusp ridge.

61
Q

Mandibular 1st premolars: Occlusal view

The crown is wider buccally than it is lingually (the crown converges towards the _________)

62
Q

Mandibular 1st premolars: Occlusal view

Due to the ______ tilt of the crown, the majority of the buccal surface is visible from this aspect. Very little of the lingual aspect is seen.

63
Q

Mandibular 1st premolars: Occlusal view

The _____ and _____ marginal ridges are well-developed and converge lingually to a small lingual cusp.

64
Q

Mandibular 1st premolars: Occlusal view

The mesiobuccal and distobuccal line angles are prominent, they are however quite ___________

65
Q

Mandibular 1st premolars: Occlusal view

The mesial and distal contact areas are centered labiolingually in the ____________

A

Middle 1/3

66
Q

Mandibular 1st premolars: Occlusal view

The buccal and lingual triangular ridges join together to form a single ridge called the _______________ ________

A

Transverse ridge

67
Q

Mandibular 1st premolars: Occlusal view

The buccal triangular ridge is well-formed whereas the lingual triangular ridge is much ________.

68
Q

Mandibular 1st premolars: Occlusal view

A transverse is formed by the fusion of two _________ _______.

A

Triangular ridges

69
Q

Mandibular 1st premolars: Occlusal view

The transverse ridge separates the ________ occlusal fossa from the ________ occclusal fossa.

A

Mesial and Distal occlusal fossae

70
Q

Mandibular 1st premolars: Occlusal view

The distal occlusal fossa is (larger/smaller) than the mesial occlusal fossa.

71
Q

Mandibular 1st premolars: Occlusal view

Due to this tooth’s occlusal morphology, an MOD cavity prep can be done in two separate restorations. MO and DO fossae (T/F)

72
Q

Mandibular 1st premolars: Occlusal view

There is a __________ ________ groove in the sulcus of the mesial occlusal fossa.

A

mesial developmental

73
Q

Mandibular 1st premolars: Occlusal view

The mesial developmental groove in the sulcus of the _________ occlusal fossa.

74
Q

Mandibular 1st premolars: Occlusal view

The mesial developmental groove passes over the ML surface and becomes the ___________________

A

ML developmental groove

75
Q

Mandibular 1st premolars: Root & Pulp Morph

The mandibular 1st premolar looks like a __________ ________.

A

Mandibular canine

76
Q

Mandibular 1st premolars: Root & Pulp Morph

The pulp morph often resemble that of the _______ ________.

A

Mandibular canine

77
Q

Mandibular 1st premolars: Root & Pulp Morph

The majority of these teeth have ______ root and _____ pulp canal.

78
Q

Mandibular 1st premolars: Root & Pulp Morph

This tooth may have ______ or ______ pulp horns.

79
Q

Mandibular 1st premolars: Root & Pulp Morph

If the lingual cusp is essentially absent/cingulum like, it may have ______ pulp horn (commonly asked on boards)

80
Q

Mandibular 1st premolars: Root & Pulp Morph

Root and pulp canal are ________ in form in cross-section.

Morph. (26 decks)

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