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Dental Morphology > Lecture 7 - Mandibular Premolars > Flashcards

Lecture 7 - Mandibular Premolars Flashcards

1
Q

what are the numbers of mandibular premolars on the left

A

1st- #21
2nd - #20

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2
Q

what are the numbers of the mandibular premolars on the right

A

1st- #28
2nd - #29

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3
Q

are mandibular premolars succedaneous teeth

A

yes they replace primary molars

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4
Q

how many lobes do mandibular first premolars develop from

A

3 facial
1 lingual

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5
Q

how many lobes do second premolars develop from

A

3 facial
1 or 2 lingual

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6
Q

what is the shape of the mandibular first premolar from the buccal view

A

trapezoidal

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7
Q

what does the buccal ridge on the mandibular first premolar develop from

A

the middle buccal lobe

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8
Q

what does the buccal cusp of the mandibular first premolar resemble

A

mandibular canine but tip is more rounded

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9
Q

describe the mesiobuccal cusp arm and distobuccal cusp arm on the mandibular first premolar

A

mesial is shorter than distal

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10
Q

describe the mesial and distal outlines from the buccal view of the mandibular first premolar

A

slightly concave

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11
Q

where are the mesial and distal heights of contour of the mandibular first premolar from the buccal view

A

middle 1/3

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12
Q

describe the cervical line from the buccal view of the mandibular first premolar

A

exhibits little curvature

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13
Q

describe the buccal surface of the mandibular first premolar

A

convex, especially in the middle and cervical third

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14
Q

describe the root of the mandibular first premolar from the buccal view compared to the mandibular canine

A

3-4 mm shorter and curves distally

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15
Q

where do the crown and root taper of the mandibular first premolar

A

toward lingual

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16
Q

describe the lingual cusp of the mandibular first premolar

A

small, may resemble the cingulum of a canine

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17
Q

describe the occlusal surface of the mandibular first premolar from the lingual view

A

slopes lingually in a cervical direction, visible from lingual view

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18
Q

describe the lingual view of the mandibular first premolar

A
  • convex
  • mesial and distal outlines are concave from the cervical margin to the contact areas
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19
Q

what does the mesiolingual developmental groove mark on the mandibular first premolar

A

demarcates the lingual lobe from the mesiobuccal lobe
- separates mesial marginal ridge from lingual cusp

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20
Q

what aspects of the mandibular first premolar are visible from the lingual view

A

the lingual, mesial, and distal aspects are visible

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21
Q

describe the root from the lingual view

A

-tapers to a pointed apex
- developmental depressions or grooves mesially on the root

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22
Q

what is the shape of the mandibular first premolar from the mesial view

A

rhomboidal in outline

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23
Q

describe the buccal outline of the mandibular first premolar from the mesial view

A

very convex

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24
Q

where does the buccal cusp tip lie in relation to a line bisecting the midline of the root of the mandibular first premolar from the mesial view

A

centered on the line

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25
Q

where is the buccal height of contour of the mandibular first premolar from the mesial view

A

junction of the middle and cervical 1/3

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26
Q

describe the lingual outline of the mandibular first premolar from the mesial view

A

less convex

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27
Q

where is the lingual height of contour of the mandibular first premolar from the mesial view

A

middle 1/3

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28
Q

where does the lingual height of contour lie in relation to the root from the mesial view of the mandibular first premolar

A

lingual to the outline of the root (hangs over the root)

29
Q

where does the lingual cusp tip of the mandibular first premolar lie in relation to the root from the mesial view

A

lies on a line with the lingual border of the root

30
Q

describe the difference in length from the CEJ to the lingual cusp tip compared to the length of the CEj to the buccal cusp tip

A

length from CEJ to lingual cusp tip is 2/3 distance from CEJ to buccal cusp tip

31
Q

describe the mesial marginal ridge of the mandibular first premolar from the mesial view

A

sloped cervically from buccal to lingual

32
Q

describe the mesiolingual developmental groove from the mesial view of the mandibular first premolar

A

separates lobe from the lingual lobe

33
Q

describe the cervical line of the mandibular first premolar from the mesial view

A

curves occlusally about 1mm

34
Q

describe the mesial surface of the mandibular first premolar

A

smoothly convex except for the mesiolingual developmental groove

35
Q

describe the root of the mandibular first premolar from the mesial view

A
  • tapered to a pointed apex
  • deep developmental depression groove on the mesial surface
36
Q

which marginal ridge is higher above the CEJ in the mandibular first premolar

A

the distal

37
Q

which tooth is the only tooth with a mesial marginal ridge lower than the distal marginal ridge

A

mandibular first premolar

38
Q

describe the distal marginal ridge of the mandibular first premolar from the distal view

A

distal marginal ridge is almost at right angles to the long axis of the tooth
- convex, may have concavity above the cervix extending buccolingually

39
Q

describe the distal contact of the mandibular first premolar

A

contact is broader than the mesial
- height of contour is in the middle 1/3rd

40
Q

describe the distal cervical curvature of the mandibular first premolar

A

less or similar to mesial curvature

41
Q

describe the root of the mandibular first premolar from the distal view

A
  • more convex than mesial - less grooved
  • shallow developmental depression but no deep groove
42
Q

what shape is the mandibular first premolar from the occlusal view

A

diamond

43
Q

describe the buccal cusp and the lingual cusp of the mandibular first premolar from the occlusal view

A

-buccal cusp and ridge are pronounced
-lingual cusp is small

44
Q

is the crown of the mandibular first premolar wider bucally or lingually

A

bucally

45
Q

describe the MB and DB line angles of the mandibular first premolar from the occlusal view

A

prominent and quite rounded

46
Q

where are mesial and distal contacts of the mandibular first premolar from the occlusal view

A

centered buccolingually

47
Q

what is the transverse ridge of the mandibular first premolar from the occlusal view

A

the buccal and lingual triangular ridges joined together to form a single ridge

48
Q

which ridge is larger on the mandibular first premolar: buccal or lingual triangualr ridge

A

buccal

49
Q

is there a central groove on the occlusal surface of the mandibular first premolar

A

sometimes

50
Q

what does the transverse ridge on the occlusal surface of the mandibular first premolar separate

A

mesial occlusal fossa from the distal occlusal fossa

51
Q

which is larger on the mandibular first premolar: distal occlusal fossa or the mesial occlusal fossa

A

distal occlusal fossa

52
Q

what does the mesiolingual developmental groove separate on the mandibular first premolar

A

the mesial marginal ridge from the lingual cusp

53
Q

describe the root of the mandibular first premolar

A

-single
- rounded
-curves distally
-grooved on distal and mesial surfaces (mesial is larger)
- root may be bifurcated (rare)

54
Q

what are the types of the mandibular 2nd premolars

A

-three cusp type (5 lobes)
- two cusp type (4 lobes)

55
Q

what is the difference between the mandibular first premolars and the mandibular 2nd premolars from the buccal view

A

buccal cusp is shorter and less pointed
- mesial and distal contact areas are broad and appear higher on the crown due to smaller buccal cusp

56
Q

where are the mesial and distal contacts of the mandibular 2nd premolars located

A

middle third, distal is more cervical

57
Q

describe the root of the mandibular 2nd premolars from the buccal view

A

root is broader mesiodistally
- apex is more blunt

58
Q

how does the mandibular 2nd premolars differ from the mandibular first premolar from the lingual view

A

-lingual lobes are better developed
- less of occlusal surface is visible
- root is wide mesiodistally but not as wide as buccal

59
Q

if the mandibular 2nd premolars is the 3 cusp type what separates the 2 lingual cusps

A

the lingual groove

60
Q

how does the mandibular 2nd premolars differ from the mandibular first premolar from the mesial view

A
  • crown and root are wider buccolingually
  • buccal cusp tip is not as lingually placed
  • buccal cusp is shorter
  • lingual and buccal cusps are more equal in size
61
Q

where is the mesial marginal ridge of the mandibular 2nd premolars from the mesial view

A

at right angle to the long axis of the tooth

62
Q

is there a mesiolingual developmental groove on the mandibular 2nd premolars

A

no

63
Q

describe the root of the mandibular 2nd premolars from the mesial view

A

root is longer and apex is more blunt

64
Q

how does the distal view of the mandibular 2nd premolars differ from the mesial view

A

distal marginal ridge is at a lower level and thus more of the occlusal surface is visible

65
Q

what is the shape of the three cusp type mandibular 2nd premolars from the occlusal view

A

square

66
Q

what are the cusps in the 3 cusp type of the mandibular 2nd premolars from the occlusal view and what is the order in size

A

2 lingual cusps and one buccal
buccal > mesiolingual > distolingual

67
Q

describe the occlusal surface of the three cusp type of the mandibular 2nd premolars

A
  • developmental grooves separate the cusps forming a Y shape on surface
    -mesial, distal, and lingual developmental grooves
  • central pit
  • mesial triangular fossa and distal triangular fossa
68
Q

describe the occlusal surface of the two cusp type of the mandibular 2nd premolars

A

H or U shaped developmental grooves
- lingual convergence of the mesial and distal marginal ridges
- lingual cusp is well developed
- central developmental groove, mesial and distal fossae
- may or may not have mesial and distal pits

69
Q

what is the shape of the mandibular 2nd premolars from the occlusal view

A

rounded

Dental Morphology (12 decks)

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