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BDS2 OSCE > Posterior tooth anatomy > Flashcards

Posterior tooth anatomy Flashcards

1
Q

shape of lower 7’s

A

more oblong/squarer than 6’s

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2
Q

how many cusps on a lower 7

A

4

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3
Q

lower 7 - are lingual or buccal cusps higher?

A

lingual cusps are higher and slightly more pointed

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4
Q

how many occlusal fossae do lower 7’s have?

A

3 - mesial central distal

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5
Q

fissure pattern for lower 7

A

hot cross bun shape - midline fissure and lateral fissure
marginal fissures - short extensions from mesial and distal pits
marginal fossae - triangular (triangular fossa?)

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6
Q

what are axial grooves?

A

extend from lateral fissures between cusps

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7
Q

what are the marginal ridges?

A

mesial and distal barrier

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8
Q

what is the function of the marginal ridge?

A

keep food on the occlusal table
prevents food trapping

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9
Q

what is usually the largest lower tooth?

A

lower 6

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10
Q

general shape of lower 6

A

oblong (like lower 7)

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11
Q

which surface of the lower 6 is rounder, buccal or lingual?

A

flat lingual surface
more rounded buccal surface

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12
Q

how many cusps does lower 6 have?

A

5 cusps

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13
Q

order cusp sizes from largest to smallest

A

mesio lingual
disto lingual
mesio buccal
centro buccal
disto buccal

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14
Q

what is the fissure pattern for lower 6?

A

dryopithicus
5 cusps where the bases of the disto and mesio lingual and centrobuccal cusps meet the central fossa

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15
Q

which side of the lower 6 has more cusps?

A

buccal size has 3 cusps, lingual side has 2 cusps

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16
Q

axial groovers of lower 6

A

divides convex buccal surface into 3 lobes

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17
Q

what is a buccal pit?

A

present in 60% of lower first molars
found on buccal surface

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18
Q

clinical relevance of buccal pit?

A

difficult to clean
predilection to caries
may require sealants

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19
Q

marginal ridges of lower 6

A

mesial is shallower than distal
dissection groover crossing the distal marginal ridge is often deep

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20
Q

which upper molar is larger?

A

upper 1st molars are usually larger than upper 2nd molars (6 > 7)

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21
Q

shape of upper first molar

A

outline resembles a rhombus

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22
Q

how many cusps does upper 6 have?

A

4 cusps

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23
Q

how many cusps does upper 7 have?

A

4 cusps

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24
Q

where are cusp tips of upper 7 located?

A

corners of the rhombic outline

25
Q

which cusp is largest and smallest on upper 6?

A

large mesiopalatal cusp
small distopalatal cusp

26
Q

what is the size of the buccal cusps of upper 6?

A

buccal cusps are similar size

27
Q

what is the cusp of carabelli?

A

5th cusp
extension to mesiopalatal cusp

28
Q

what is the crista obliqua?

A

in upper first molars there are distinguished by a prominent oblique ridge (between MP and DB)

29
Q

Fissure pattern of upper 6

A

draw in head lol

30
Q

what are palatal pits?

A

occur commonly at the end of the palatal axial groove. on upper 6’s

31
Q

shape of upper 7’s

A

similar to upper 6

32
Q

what is the distopalatal cusp called?

A

hypoconus

33
Q

does upper 7 have a cusp of carabelli?

A

usually not

34
Q

how does the distopalatal cusp vary with the tooth?

A

distopalatal cusp diminishes in size from 6 to 7 to 8

35
Q

fissure pattern of upper 7

A

buccal lateral fissure may be angled distally

36
Q

shape of upper 5

A

egg-shaped, oval, rounded (oval is longer on B-P axis than M-D)

37
Q

how are upper 5’s different to upper 4’s

A

upper 5 and 4 are similar but
5 usually more rounded and more symmetrical

38
Q

is the buccal or palatal upper 5 wider?

A

wider buccally than palatally

39
Q

how many cusps do upper premolars have?

A

2

40
Q

what are transverse ridges?

A

approximately perpendicular to the tooth midline in upper 5

41
Q

how many fossae in upper 5’s?

A

2 - one mesial and one distal

42
Q

fissure pattern of upper premolars

A

primary fissure pattern very simple
known as h form

43
Q

dissectional grooves of upper 5

A

less obvious than other teeth and might be absent/poorly defined

44
Q

where is palatal cusp tip of upper 4 placed?

A

palatal cusp tip mesially placed

45
Q

cusps of upper 4 compared to upper 5

A

upper 4 buccal cusps are higher than palatal but upper 5 have more even buccal and palatal cusps
4 has sharper cusps

46
Q

how many roots of upper 4?

A

upper 4 may have 1 or 2 roots

47
Q

which tooth has the canine groove and what is it?

A

single rooted upper 4’s
concavity on the mesial surface, often extending from mesial disectional groove

48
Q

lower 5 shape

A

squarer occlusal outline

49
Q

how many cusps does lower 5 have?

A

3 cusps

50
Q

how many fossae does lower 5 have?

A

3 fossae

51
Q

what ridges does lower 5 have?

A

transverse and oblique ridges

52
Q

which part of the lower 5 is the most curved?

A

buccal cusp is more curved

53
Q

what fissure pattern shape does the lower 5 have?

A

Y-form - 3 cusps, unique and most common
sometimes has H form

54
Q

which premolar is the smallest in the mouth?

A

lower 4

55
Q

shape of lower 4

A

circular outline
buccal cusp makes up the bulk of the crown

56
Q

fossae and fissures of lower 4

A

2 fossae (distal is larger)
fissures may be poorly developed/absent

57
Q

does the lower 4 have well defined transverse ridges?

A

yes
mesial dissectional groove orientated lingually

58
Q

How do the posterior teeth occlude?

A

Upper 2nd premolar - cusp tip positioned between lower 2nd premolar and 1st molar
Upper 1st molar - medial buccal cusp fits into buccal groover of lower 1st molar
Upper 2nd molar - medial buccal cusp fits into buccal groover of lower second molar

BDS2 OSCE (15 decks)

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