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Dental Morphology > Lecture 6 - Maxillary Premolars > Flashcards

Lecture 6 - Maxillary Premolars Flashcards

1
Q

what are the numbers of the maxillary right first and second premolar

A

1st- #5
2nd - #4

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2
Q

what are the numbers of the maxillary left first and second premolars

A

1st- #12
2nd- #13

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3
Q

what are the 2 cusps on the maxillary premolars and describe each

A

lingual - functional cusp
buccal - non-functional cusp

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4
Q

are premolars succedaneous teeth

A

yes they replace deciduous molar teeth

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5
Q

what are the lobes of the maxillary first premolars

A

-3 buccal lobes ( mesial buccal, middle, and distobuccal)
- 1 lingual lobe - develops into the lingual cusp

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6
Q

what does the buccal cusp develop from on maxillary first premolars

A

the middle buccal lobe

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7
Q

what is the central developmental groove on maxillary first premolars

A

a demarcation between the lingual and buccal lobes

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8
Q

describe the shape of the maxillary first premolar from the buccal view

A

roughly trapezoidal

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9
Q

describe the buccal cusp arms (M vs D) of the maxillary first premolars

A

-mesial cusp arm is longer and straighter
- distal cusp arm is shorter and more curved

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10
Q

where is the buccal height of contour of the maxillary first premolars

A

in the cervical third

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11
Q

where is the mesial contact of the maxillary first premolars

A

middle 1/3rd

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12
Q

describe the mesial outline from the facial view of the maxillary first premolars

A

mesial concavity below the contact

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13
Q

where is the distal contact of the maxillary first premolar

A

middle 1/3rd, larger contact (broader) and more cervical

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14
Q

describe the distal outline of the maxillary first premolar from the facial view

A

generally convex

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15
Q

describe the lobes/ridges on the buccal view of the maxillary first premolars

A

-middle buccal lobe -> prominent buccal ridge and associated developmental depressions
- less developed mesial and distal lobes -> mesial and distal line angles

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16
Q

which direction does the crown taper of the maxillary first premolars

A

lingually
- lingual is more narrow than buccal

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17
Q

describe the lingual cusp of the maxillary first premolars

A

-smoothly convex
- 1 mm shorter than buccal cusp and more pointed

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18
Q

where is the lingual cusp located of the maxillary first premolars

A

mesially

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19
Q

describe the lingual cusp arms (M vs D) of the maxillary first premolars

A

mesiolingual cusp arm is shorter than the distolingual cusp arm

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20
Q

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

A

trapezoidal

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21
Q

what cusps are visible from the mesial view of the maxillary first premolars

A

both lingual and buccal

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22
Q

where is the buccal height of contour of the maxillary first premolars

A

cervical 1/3

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23
Q

where is the lingual height of contour of the maxillary first premolars

A

middle 1/3

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24
Q

what depressions are visible from the mesial view of the maxillary first premolars

A

developmental depression on the cervical portion of the crown and the root

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25
Q

where is the mesial contact area for the maxillary first premolar from the mesial view

A

middle 1/3 and offset buccally

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26
Q

how many roots do maxillary first premolars have

A
  • 50-60% have 2 roots (buccal and lingual)
  • 50% have 1 root
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27
Q

how long is the root trunk of the maxillary first premolars

A

1/2-2/3 the length of the root

28
Q

what are the differences between the distal view and the mesial view of the maxillary first premolars

A

-distal view does not have concavity, developmental depreesion, or marginal ridge developmental groove
- curvature of CEJ is less

29
Q

where is the distal contact area from the distal view of the maxillary first premolars

A

middle 1/3
-offset buccally
-contact borader
- located more cervical than mesial

30
Q

describe shape of the the maxillary first premolars from the occlusal view

A

hexagonal in outline

31
Q

which dimension is the maxillary first premolars larger in from occlusal view: BL or MD

A

BL > MD

32
Q

how many ridges make up each cusp on the maxillary first premolars

A

4 ridges each

33
Q

where is the buccal triangular ridge of the maxillary first premolars located from the occlusal view

A

from the central developmental groove to the middle cusp

34
Q

where is the lingual triangular ridge of the maxillary first premolars located from the occlusal view

A

from the central developmental groove to the lingual cusp

35
Q

what is the difference between the buccal and lingual triangular ridges from the occlusal view of the maxillary first premolars

A

lingual less prominent and angled not straight

36
Q

what is a triangular ridge

A

prominent elevation, triangular in cross-section, which extends from the tip of a cusp towards the central portion of the occlusal surface of a tooth

37
Q

what ridges are visible from the maxillary first premolars occlusal view

A
  • mesial and distal marginal ridges
38
Q

what grooves are visible from the maxillary first premolars occlusal view

A

-central developmental groove
- mesial marginal ridge developmental groove
- mesiobuccal and distobuccal supplemental groove

39
Q

what pits and fossa are visible from the maxillary first premolars occlusal view

A

mesial and distal developmental pits
mesial and distal triangular fossa

40
Q

what does the root from the buccal (MD) aspect of the maxillary first premolar resemble

A

the root of the canine

41
Q

describe the root of the maxillary first premolar in cross section

A

broad BL, narrow MD
- kidney shaped
- mesial developmental depression

42
Q

how many pulp horns and pulp canals are there in the maxillary first premolar

A

2 pulp horns and 2 pulp canals ( buccal is larger canal)

43
Q

what is a distinct feature to help identify the maxillary first premolar

A

the mesial marginal ridge developmental groove on the occlusal surface

44
Q

what are the main differences between the maxillary first premolar and the maxillary second premolar

A
  • smaller
  • more rounded
  • single rooted
  • more shape variations
45
Q

what are the differences from the buccal view from the maxillary first premolar and the maxillary second premolar

A
  • MB and DB line angles are less prominent
  • buccal cusp ridge not as obvious
  • buccal developmental depressions not as developed
46
Q

compare the MB cusp arm to DB cusp arm of the maxillary second premolar from the buccal view

A

MB cusp arm is shorter than the DB cusp arm

47
Q

what is the difference between the lingual view of the maxillary first premolar and the maxillary second premolar

A

lingual cusp is longer in the second premolar so less visibility of the buccal cusp lingually

48
Q

describe the buccal and lingual cusps of the maxillary second premolar from the mesial view

A

buccal and lingual cusps are approximately equal in size but shorter compared to first premolar

49
Q

where is the mesial contact from the mesial view of the maxillary second premolar

A

middle 1/3 and slightly offset buccally

50
Q

describe the mesial view of the maxillary second premolar

A

no mesial marginal ridge developmental groove
no mesial developmental depression
single tapered root

51
Q

where is the distal contact from the distal view of the maxillary second premolar

A

middle 1/3 and offset to the buccal

52
Q

what shape is the maxillary second premolar from the occlusal view

A

rounded or oval

53
Q

describe the MB and DB line angles of the maxillary second premolar from the occlusal view

A

more rounded

54
Q

describe the central developmental groove of the maxillary second premolar from the occlusal view

A

central developmental groove is shorter therefore, mesial and distal marginal ridges are wider

55
Q

describe the supplemental grooves of the maxillary second premolar from the occlusal view

A

numerous supplemental grooves - wrinkled appearance

56
Q

describe the root of the second premolar

A

-single tapered root 50% have two canals
- root length the same as first premolar
broad BL, narrow MD
- no developmental depression
- oval shaped in cross section

57
Q

how many pulp horns and canals do the maxillary second premolar have

A

two pulp horns and 50% have two canals

58
Q

where is the mesial height of contour of the maxillary second premolar

A

middle third

59
Q

where is the distal height of contour of the maxillary second premolar

A

middle third

60
Q

where is the buccal height of contour of the maxillary second premolar

A

cervical third

61
Q

where is the lingual height of contour of the maxillary second premolar

A

middle third

62
Q

when does the maxillary first premolar erupt

A

10-11 years

63
Q

when does the maxillary second premolar

A

11-12 years

64
Q

describe the cervico- occlusal length of the maxillary first premolar crown vs the maxillary second premolar crown

A

same length

65
Q

describe the MD diameter of crown of the maxillary first premolar crown vs the maxillary second premolar crown

A

same

66
Q

describe the root length of the maxillary first premolar vs the maxillary second premolar

A

same

Dental Morphology (12 decks)

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