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Dental Morph (all material) > Lecture 6&7- Premolars > Flashcards

Lecture 6&7- Premolars Flashcards

1
Q

when do maxillary 1st premolars erupt?

A

10-11 years

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2
Q

when do maxillary 2nd premolars erupt?

A

10-12 years

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3
Q

when do mandibular 1st premolars erupt?

A

10-11 years

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4
Q

when do mandibular 2nd premolars erupt?

A

10-12 years

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5
Q

calcification time of maxillary 1st premolars

A

1.5-1.75

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6
Q

calcification time of mandibular 1st premolars

A

1.75-2

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7
Q

calcification time of maxillary 2nd premolars

A

2-2.25

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8
Q

calcification time of mandibular 2nd premolars

A

2.25-2.5

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9
Q

are maxillary 1st premolars wider BL or MD?

A

BL

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10
Q

are maxillary 2nd premolars wider BL or MD?

A

BL

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11
Q

are mandibular 1st premolars wider BL or MD?

A

BL

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12
Q

are mandibular 2nd premolars wider BL or MD?

A

BL

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13
Q

facial contour height of maxillary 1st premolars is where?

A

cervical 1/3

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14
Q

facial contour height of maxillary 2nd premolars is where?

A

cervical 1/3

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15
Q

facial contour height of mandibular 1st premolars is where?

A

cervical 1/3

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16
Q

facial contour height of mandibular 2nd premolars is where?

A

cervical 1/3

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17
Q

lingual contour height of maxillary 1st premolars is where?

A

middle 1/3

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18
Q

lingual contour height of maxillary 2nd premolars is where?

A

middle 1/3

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19
Q

lingual contour height of mandibular 2nd premolars is where?

A

middle 1/3

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20
Q

lingual contour height of mandibular 1st premolars is where?

A

middle 1/3

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21
Q

how many roots do maxillary 1st premolars have?

A

2

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22
Q

how many roots do maxillary 2nd premolars have?

A

1

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23
Q

how many roots do mandibular 1st premolars have?

A

1

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24
Q

how many roots do mandibular 2nd premolars have?

A

1

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25
Q

shape of F/L surface of maxillary 1st premolars?

A

trapezoidal

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26
Q

shape of F/L surface of maxillary 2nd premolars?

A

trapezoidal

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27
Q

shape of F/L surface of mandibular 1st premolars?

A

trapezoidal

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28
Q

shape of F/L surface of mandibular 2nd premolars?

A

trapezoidal

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29
Q

shape of M/D surface of maxillary 1st premolars?

A

trapezoidal

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30
Q

shape of M/D surface of maxillary 2nd premolars?

A

trapezoidal

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31
Q

shape of M/D surface of mandibular 1st premolars?

A

rhomboidal

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32
Q

shape of M/D surface of mandibular 2nd premolars?

A

rhomboidal

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33
Q

shape of I/O surface of maxillary 1st premolars?

A

hexagonal

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34
Q

shape of I/O surface of maxillary 2nd premolars?

A

ovoid

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35
Q

shape of I/O surface of mandibular 1st premolars?

A

diamond

36
Q

shape of I/O surface of mandibular 2nd premolars?

A

Y>H>U

37
Q

which is bigger for posterior teeth?
facial embrasure
lingual embrasure

A

lingual embrasure

38
Q

which is bigger for posterior teeth?
occlusal embrasure
gingival embrasure

A

they are equal

39
Q

what is tooth #5?

A

right maxillary premolar

40
Q

what is tooth #12?

A

left maxillary premolar

41
Q

are premolars succedaneous or non-succedaneous?

A

succadaneous

42
Q

are the 1st or 2nd maxillary premolars bigger?

A

1st

43
Q

how many cusps do the maxillary 1st premolars have?

A

two

44
Q

how many lobes do the maxillary 1st premolars develop from?

A

four

45
Q

in the buccal view, which cusp arm is longer in the maxillary 1st premolars?

A

mesial cusp arm

46
Q

where is the mesial contact in maxillary 1st premolars?

A

middle 1/3

47
Q

where is the distal contact in maxillary 1st premolars?

A

middle 1/3

48
Q

what ridge is present on the buccal surface of maxillary 1st premolars?

A

buccal ridge

49
Q

which way does the crown taper in maxillary 1st premolars?

A

lingually

50
Q

which cusp is longer in the maxillary 1st premolars?

A

buccal cusp

51
Q

in the lingual view, which cusp arm is longer in the maxillary 1st premolars?

A

distolingual cusp arm
*opposite of buccal cusp

52
Q

what depression is present in the mesial view of maxillary 1st premolars?

A

mesial developmental depression

53
Q

which premolars have a mesial marginal ridge developmental groove?

A

maxillary 1st premolars

54
Q

which premolars have a central developmental groove?

A

all of them

55
Q

in the buccal view, which cusp arm is longer in the maxillary 2nd premolars?

A

distobuccal cusp arm

56
Q

in the maxillary 2nd premolars, which cusp is longer?

A

approximately the same size

57
Q

where is the mesial contact in maxillary 2nd premolars?

A

middle 1/3

58
Q

where is the distal contact in maxillary 2nd premolars?

A

middle 1/3

59
Q

how many cusps do the maxillary 2nd premolars have?

A

two

60
Q

how many lobes do the maxillary 2nd premolars develop from?

A

four

61
Q

does the root of maxillary 2nd premolars have developmental depressions?

A

no

62
Q

what tooth is #4?

A

right maxillary 2nd premolar

63
Q

what tooth is #13?

A

left maxillary 2nd premolar

64
Q

what tooth is #28?

A

right mandibular 1st premolar

65
Q

what tooth is #21?

A

left mandibular 1st premolar

66
Q

how many lobes do mandibular 1st premolars develop from?

A

four

67
Q

what ridge is prominent on buccal view of mandibular 1st premolars?

A

buccal ridge

68
Q

in the buccal view, which cusp arm is longer in the mandibular 1st premolars?

A

distal cusp arm

69
Q

which premolar has the mesiolingual developmental groove?

A

mandibular 1st premolar

70
Q

what does the mesiolingual developmental groove separate?

A

mesial marginal ridge and lingual cusp

71
Q

do the mandibular 1st premolars have depressions on the root?

A

yes-mesially

72
Q

which cusp tip in the mandibular 1st premolars has a greater distance from the CEJ?

A

buccal cusp tip

73
Q

in which tooth is the mesial marginal ridge at a lower level than the distal marginal ridge?

A

mandibular 1st premolars

74
Q

in the lingual view, which cusp arm is longer in the mandibular 1st premolars?

A

distobuccal cusp arm

75
Q

which premolar has an uninterrupted transverse ridge?

A

mandibular 1st premolars

76
Q

in mandibular 1st premolars, which triangular ridge is larger?
buccal
lingual

A

buccal triangular ridge is larger

77
Q

what does the transverse ridge separate?

A

the mesial occlusal fossa from the distal occlusal fossa

78
Q

what is tooth #29?

A

right mandibular 2nd premolar

79
Q

what is tooth #20?

A

left mandibular 2nd premolar

80
Q

how many cusps do the mandibular 2nd premolars have?

A

three
OR
two

81
Q

how many lobes are the mandibular 2nd premolars derived from?

A

five (3 cusp)
four (2 cusp)

82
Q

which mandibular premolar has a better developed lingual lobe?

A

2nd

83
Q

which premolar has a lingual groove?

A

mandibular 2nd premolar (3 cusp type)

84
Q

which mandibular premolar is larger?

A

2nd

85
Q

which premolar crowns have a lingual inclination?

A

mandibular premolars

86
Q

which premolar crowns are centered over the root?

A

maxillary premolars

87
Q

what shape is most common for the occlusal surface of the mandibular 2nd premolars?

A

Y

Dental Morph (all material) (10 decks)

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