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NBDE I > Dental Anatomy Permanent Molars > Flashcards

Dental Anatomy Permanent Molars Flashcards

1
Q

the occlusal outline form of an occlusal view for the maxillary first molar is ___

A

rhomboidal

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2
Q

in the occlusal outline of maxillary 1st and 2nd molars, which angles tend to be acute?

A
  • mesiofacial and distolingual

- therefore, the mesiolingual and distofacial angles tend to be obtuse

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3
Q

the maxillary 1st molar tends to taper in which direction/? what is the result with respect to embrasures?

A

tends to taper toward the facial rather than lingual, so the buccal embrasure is larger than the lingual

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4
Q

what are the most prone facial and lingual surfaces of molars?

A

-lingual of maxillary molars and facial of mandibular molars

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5
Q

the largest root of the maxillary molar is the ___

A

palatal

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6
Q

the smallest root of the maxillary molar is the ___

A

distobuccal (remember, the MB root needs room for MB2 so it will be bigger than the DB root)

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7
Q

in the maxillary 1st molar, from the ___ view, the apex of the palatal root is in line with the facial groove of the tooth

A

facial view

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8
Q

in the maxillary 1st molar, from the ___ view, the apex of the palatal root is in line with the midpoint of the MD diameter

A

lingual view

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9
Q

when a 4th canal is present in a maxillary 1st molar, it is usually present in which root/canal system?

A

MB (MB2)

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10
Q

of the 3 furcations of a maxillary 1st molar, the ___ is closest to the cervical line

A
  • mesial

- distance of furcations from cervical line: M < B < D

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11
Q

of the 3 furcations of a maxillary 1st molar, the ___ is the furthest from the cervical line

A
  • distal

- distance of furcations from cervical line: M < B < D

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12
Q

the oblique ridge of maxillary molars forms the ___ boundary of the central fossa

A

distal

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13
Q

in the maxillary molars, the (acute/obtuse) corners coincide with the direction of the oblique ridge

A

obtuse

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14
Q

the center of the oblique ridge on a maxillary 1st molar is at the same level with the ___

A

marginal ridge

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15
Q

the oblique ridge of maxillary molars connects which cusps?

A

ML and DF

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16
Q

which cusp of maxillary molars occludes in the central fossa of mandibular molars?

A

ML

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17
Q

which tooth has the greatest FL diameter of the crown for all teeth?

A

maxillary 1st molar (think of the cusp of carabelli)

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18
Q

which maxillary posterior tooth is closest in size FL vs MD?

A

maxillary 1st molar

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19
Q

is the maxillary 1st molar wider MD toward the facial or lingual?

A

facial

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20
Q

what is the only cusp of the maxillary molars that is not part of the molar cusp triangle?

A

DL

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21
Q

what is the largest and longest cusp on maxillary 1st molars?

A

ML

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22
Q

which tooth is most commonly forced into the maxillary sinus during an extraction?

A

maxillary 1st molar

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23
Q

which maxillary molar has a distal concavity that can pose special problems in matrix placement?

A

maxillary 1st molar

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24
Q

does the maxillary 1st or 2nd molar have a shorter DL groove?

A

1st is shorter than 2nd

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25
Q

what is the shape of a maxillary molar is the DL cusp is not present?

A

3-cusp heart shape

26
Q

the roots of maxillary 2nd molar tend to be (more/less) divergent and have (greater/fewer) distal inclinations

A

less, greater

27
Q

the cervical cross sectional outline of the primary maxillary 2nd molar is roughly what shape?

A

triangular

28
Q

what is the groove pattern for the mandibular 1st molar?

A

Y or dryopethicus pattern

29
Q

the occlusal outline of a mandibular 1st molar is a ___

A

pengaton

30
Q

the smallest cusp of the mandibular 1st molar is the ___

A
  • distal cusp

- MB > ML > DL > DB > D

31
Q

the largest cusp of the mandibular 1st molar is the ___

A
  • MB

- MB > ML > DL > DB > D

32
Q

which tooth has the largest MD crown dimensions of any other tooth?

A

mandibular 1st molar

33
Q

what are the only mandibular teeth that are wider MD than FL?

A

mandibular molars

34
Q

what are the only posterior teeth that are wider MD than FL

A

mandibular molars

35
Q

which molar has the greatest MD diameter of all molars

A

mandibular 1st molars

36
Q

which tooth has the largest FL crown dimension of any other mandibular tooth?

A
  • mandibular 1st molar

- remember, the maxillary 1st molar has the greatest FL crown dimension of any tooth overall

37
Q

which tooth has the largest occluso-cervical crown dimension of any mandibular tooth?

A

mandibular 1st molar

38
Q

the facial surfaces of mandibular molars are located ___ to the border of the ascending ramus

A

medial

39
Q

what is a key feature that differentiates a mandibular 1st and 2nd molar?

A
  • the number of developmental grooves

- 2nd molar has 1 buccal

40
Q

how many facial cusps does the mandibular 1st molar have?

A

3

41
Q

the developmental groove between the DF cusp and the D cusp of the mandibular 1st molar is ___

A

DF (NOT distal)

42
Q

the mandibular 1st molar usually has ___ roots with ___ canals

A

2,3

43
Q

mandibular 1st molars usually have ___ mesial canal(s)

A

2

44
Q

which molar has the longest root of any other molar?

A

mandibular 1st molar

45
Q

which tooth has the greatest root separation of any other tooth?

A

mandibular 1st molar

46
Q

what is the largest area at mid-root cross section of mandibular 1st molars?

A

mesial (think about needing room for MB2)

47
Q

which root of which tooth has the greatest FL dimension of any other root?

A

mandibular 1st molar M root

48
Q

which cusp of mandibular molars occludes in the central fossa of the maxillary molars?

A

DB cusp

49
Q

the ideal position and height of lingual cusps of mandibular 1st molars accommodates ___

A

working movement

50
Q

what is the groove pattern for the mandibular 2nd molar? what is the occlusal pattern?

A
  • groove pattern is a cross (+) pattern

- occlusal pattern is a cruciform pattern

51
Q

in the occlusal view of a mandibular 2nd molar, what is the greatest FL diameter?

A

mesial 3rd (that’s how you tell R from L)

52
Q

what are the only posterior teeth that are wider MD than FL?

A

mandibular molars

53
Q

what are the only mandibular teeth that are are wider MD than FL?

A

mandibular molars

54
Q

the crown of the mandibular 2nd molar inclines to the ___ and ___

A

mesial and lingual (think of the larger mesial cusps weighing it down)

55
Q

mandibular molars have the long axis of their root apices __ and their crowns ___

A

facial, lingual

56
Q

the facial surfaces of mandibular molars are located ___ to the border of the ascending ramus

A

medial

57
Q

which maxillary molar most frequently only has 3 cusps?

A

maxillary 3rd molar

58
Q

maxillary 3rd molars from an occlusal view are frequently ___ shaped

A

heart, because they are missing the DL cusp

59
Q

which teeth have the most variation in crown morphology?

A

3rd molars

60
Q

which teeth have the greatest distal root inclination of any other tooth?

A

mandibular 3rd molars

61
Q

which tooth has the shortest root of any mandibular tooth?

A

mandibular 3rd molar

NBDE I (7 decks)

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