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Maxillary 1st Premolars (Ye's Version) Flashcards

1
Q

Maxillary right 1st premolar tooth #?

A

5

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2
Q

Maxillary left 1st premolar tooth #?

A

12

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3
Q

Maxillary 1st premolar: Chronological Events

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

A

First evidence of calcification: 1.5-1.75 yrs
Enamel completed (crown completed): 5-6 yrs
Eruption: 10-11 yrs
Root completion: 12-13 yrs

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3
Q

Maxillary 1st premolar: Lobe Development

Develops from how many lobes? How many facial/lingual lobes?

A

4 lobes: 3 facial, 1 lingual

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4
Q

Maxillary 1st premolar:

What are the facial lobes?

A

3 lobes: MB, buccal/midbuccal, DB

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5
Q

Maxillary 1st premolar:

The ________ lobe (which is well-developed and gives rise to the buccal cusp and to the prominent buccal ridge)

A

Buccal/mid buccal

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6
Q

Maxillary 1st premolar:

The ________ lobe gives rise to the lingual cusp.

A

Lingual

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7
Q

Maxillary 1st premolar:

Central development groove is the demarcation between the _______ lobe and the _______ lobes.

A

Lingual; buccal

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7
Q

Maxillary 1st premolar:

Have _______ well-developed cusps. One _______ and one _______ cusp.

A

Buccal; lingual

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7
Q

Maxillary 1st premolar:

The _______ cusp is referred to as the “functional cusp,” while the ______ cusp is referred to as the “non-functional cusp”

A

Lingual; buccal

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8
Q

Maxillary 1st premolar:

These teeth are succedaneous teeth or non-succedaneous teeth? What does that mean?

A

They ARE succedaneous - replace deciduous maxillary molars

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9
Q

Maxillary 1st premolar: BUCCAL view

Resembles a ________________

A

Maxillary canine

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10
Q
A
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11
Q

Maxillary 1st premolar: BUCCAL view

Geometric outline form is roughly _____________

A

Trapezoidal

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11
Q

Maxillary 1st premolar: BUCCAL view

MESIAL cusp arm (also called cusp ridge) of the buccal cusp is ________ and ________ than the distal cusp arm.

A

Longer; straighter

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12
Q

Maxillary 1st premolar: BUCCAL view

DISTAL cusp arm is _______ and more ________

A

shorter; more curved

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13
Q

Maxillary 1st premolar: BUCCAL view

The mesial cusp arm of the buccal cusp is also called the _______________ arm.

A

Mesio-buccal cusp arm

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14
Q

Maxillary 1st premolar: BUCCAL view

The DISTAL cusp arm of the buccal arm is also called the ____________ arm.

A

Disto-buccal cusp arm

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15
Q

Maxillary 1st premolar: BUCCAL view

The mesial contact area is located in the __________ cervicoocclusally.

A

Middle 1/3

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16
Q

Maxillary 1st premolar: BUCCAL view

The distal contact is also in the middle 1/3, however, it is broader and located more _________ compared to the mesial contact.

A

Cervically

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17
Q

Maxillary 1st premolar: BUCCAL view

There is a ______________ below the mesial contact

A

Mesial concavity

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18
Q

Maxillary 1st premolar: BUCCAL view

The labial surface is generally _________ (concave/convex)?

A

Convex

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19
Q

Maxillary 1st premolar: BUCCAL view

There is a prominent buccal ridge (develops from the buccal lobe) and associated developmental depressions (________ and ________ line angles respectively)

A

Mesial; Distal

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20
Q

Maxillary 1st premolar: BUCCAL view

Which lobes are less developed and give rise to mesial and distal line angles respectively?

A

Mesial and distal lobes

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21
Q

Maxillary 1st premolar: LINGUAL view

Crown tapers __________ - the lingual part of the crown is _________ M-D compared to the buccal part

A

Lingually; narrower

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22
Q

Maxillary 1st premolar: LINGUAL view

The lingual cusp is ___mm shorter and (more/less) pointed than the buccal cusp?

A

1mm; MORE

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22
Q

Maxillary 1st premolar: LINGUAL view

The lingual surface is smoothly ________ (concave/convex)

A

Convex

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23
Q

Maxillary 1st premolar: LINGUAL view

The _______ cusp is more visible when viewing the tooth from the lingual aspect.

A

Buccal

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24
Q

Maxillary 1st premolar: LINGUAL view

The lingual cusp is located ________ to the long axis.

A

Mesially

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25
Q

Maxillary 1st premolar: LINGUAL view

The ___________ cusp arm is shorter than the distolingual (DL) cusp arm.

OPPOSITE OF THE BUCCAL CUSP

26
Q

Maxillary 1st premolar: MESIAL view

The geometric outline is ___________ in shape

A

Trapezoidal

27
Q

Maxillary 1st premolar: MESIAL view

How many cusps are visible? What cusps are they?

A

2 cusps; buccal and lingual

28
Q

Maxillary 1st premolar: MESIAL view

The buccal cusp is ______ (shorter/taller) by ___mm cervicooclusally.

A

Taller; 1mm

29
Q

Maxillary 1st premolar: MESIAL view

The cusp tips are located within the __________ of the root surface

30
Q

Maxillary 1st premolar: MESIAL view

The buccal and height of contour (HOC) is located in the __________

A

Cervical 1/3

31
Q

Maxillary 1st premolar: MESIAL view

The lingual height of contour (HOC) is located in the ___________.

A

Middle 1/3

32
Q

Maxillary 1st premolar: MESIAL view

The buccal surface is not as _________ (concave/convex) as the lingual surface

33
Q

Maxillary 1st premolar: MESIAL view

There is a ___________________ which crosses the mesial marginal ridge from the occlusal surface.

A

Mesial marginal ridge developmental DEPRESSION/CONCAVITY

34
Q

Maxillary 1st premolar: MESIAL view

Do maxillary 2nd premolars have this developmental depression/concavity?

35
Q

Maxillary 1st premolar: MESIAL view

There is a _______________ which crosses the mesial marginal ridge from the occlusal surface.

A

Mesial marginal ridge developmental groove

36
Q

Maxillary 1st premolar: MESIAL view

The mesial contact area is located in the ___________ of the tooth F-L but it offset to the _________.

A

Middle 1/3; offset to BUCCAL

37
Q

Maxillary 1st premolar: MESIAL view

How many roots are visible? What are they? AND what % of the time are there this many?

A

2 roots; buccal and linugal; 50% of the time - there are 2 roots

38
Q

Maxillary 1st premolar: MESIAL view

Even those with one root typically have ______ pulp canals, one buccal and one lingual.

A

2 pulp canals

39
Q

Maxillary 1st premolar: MESIAL view

The root trunk takes up _________ of the length of the root.

A

1/2-2/3 length of root

40
Q

The __________ is the part of the root which extends from the CEJ to the point where the root divides.

A

Root trunk

41
Q

Maxillary 1st premolar: DISTAL view

Differences between the distal and mesial aspect of the tooth:

Absence of ____________ AND ____________

A

NO:

  1. Mesial concavity/mesial developmental depression
  2. Mesial marginal ridge developmental groove
42
Q

Maxillary 1st premolar: DISTAL view

Differences between the distal and mesial aspect of the tooth:

The curvature of the cervical line on distal is ______ (Less/More) than that on the mesial surface.

43
Q

Maxillary 1st premolar: DISTAL view

Differences between the distal and mesial aspect of the tooth:

The distal contact area is located in ________ and offsets to the _________ also.

A

Middle 1/3; offsets to buccal

44
Q

Maxillary 1st premolar: OCCLUSAL view

__________ in outline

45
Q

Maxillary 1st premolar: OCCLUSAL view

The B-L dimension is _________ (lesser/greater) than the M-D dimension.

46
Q

Maxillary 1st premolar: OCCLUSAL view

The crown is wider on the _______ than the ________

A

Buccal than the Lingual

47
Q

Maxillary 1st premolar: OCCLUSAL view

How many cusps are visible? Which ones are they?

A

2 cusps; 1 buccal and 1 lingual

48
Q

Maxillary 1st premolar: OCCLUSAL view

How many ridges does each cusp have?

49
Q

Maxillary 1st premolar: OCCLUSAL view

What are the 4 ridges in each cusp?

A
  • Mesial cusp ridge (cusp arm)
  • Distal cusp ridge (cusp arm)
  • Buccal or lingual ridge (cusp arm)
  • Triangular ridge
50
Q

Maxillary 1st premolar: OCCLUSAL view

The mesiobuccal (MB) cusp is _______ (shorter/longer) than the distobuccal (DB) cusp ridge?

51
Q

Maxillary 1st premolar: OCCLUSAL view

The mesiolingual (ML) cusp ridge is _________ (shorter/longer) than the distolingual (DB) cusp ridge.

52
Q

Maxillary 1st premolar: OCCLUSAL view

Which is more prominent (Buccal or Lingual triangular ridge)?

A

Buccal triangular ridge

53
Q

Maxillary 1st premolar: OCCLUSAL view

The ___________ and __________ marginal ridges are well developed.

A

Mesial and Distal

54
Q

Maxillary 1st premolar: OCCLUSAL view

The mesiobuccal (MB) cusp ridge and the mesial marginal ridge form almost a ______ degree angle.

55
Q

Maxillary 1st premolar: OCCLUSAL view

The distobuccal (DB) cusp ridge and the distal marginal ridge form an _______ angle.

56
Q

Maxillary 1st premolar: OCCLUSAL view

What things form an acute angle here?

A

DB cusp ridge and distal marginal ridge

57
Q

Maxillary 1st premolar: OCCLUSAL view

What demarcations are seen here? (there are a lot)

A
  • Central developmental groove
  • Mesial marginal ridge developmental groove
  • Mesiobuccal (MB) AND distobuccal (DB) supplemental developmental grooves

-Mesial AND distal developmental pits. Where the mesiobuccal and the distobuccal supplemental grooves meet the central groove

-Mesial AND distal triangular fossae

58
Q

Maxillary 1st premolar: Roots

How many roots are there 50-60% of the time?

A

2 separate roots: 1 buccal and 1 lingual

59
Q

Maxillary 1st premolar: Roots

When there are two roots, there is a _________

A

Bifurcation

60
Q

Maxillary 1st premolar: Roots

Remember even when there is 1 root, there are usually _______ pulp canals.

61
Q

Maxillary 1st premolar: Roots

From the buccal, the root resembles the root of a _______ (what tooth?), besides the fact that it is 3-4 mm _______ (shorter/longer).

A

Canine; shorter

62
Q

Maxillary 1st premolar: Roots

The root is broad _____ and narrow ______

A

BL- broad
MD - narrow

63
Q

Maxillary 1st premolar: Roots

The root has a _______ (long/short) root trunk. __________ (measurement) the length of the root.

A

Long; 1/2-2/3

64
Q

Maxillary 1st premolar: Roots

There is a ______________ landmark located here.

A

Mesial marginal ridge developmental depression

65
Q

Maxillary 1st premolar: Pulp Morphology

In a B-L section, how many pulp horns and pulp canals are there?

A

2 pulp horns; 2 pulp canals

66
Q

Maxillary 1st premolar: Pulp Morphology

The buccal pulp horn is _______ (shorter/longer) than the lingual pulp horn.

67
Q

Maxillary 1st premolar: Pulp Morphology

In a mesiodistal section, the root resembles the root of a ________.

68
Q

Maxillary 1st premolar: Pulp Morphology

In a transverse cross section, the root is ________ shaped.

A

Kidney shaped

Morph. (26 decks)

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