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Oral Biology BDS1 > Permanent Molars > Flashcards

Permanent Molars Flashcards

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1
Q

what is the shape of the occlusal surface of an upper first molar?

A

diamond-shaped

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2
Q

what is the largest cusp on the upper first molar

A

the mesio-palatal cusp

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3
Q

what is the smallest cusp on the upper first molar?

A

the disto-palatal cusp

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4
Q

what is the longest diagonal on the occlusal surface of the upper first molar?

A

it goes from the mesio-buccal to the disto-palatal cusp

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5
Q

what is an oblique ridge

A

a strong ridge of enamel on the occlusal surface of a tooth

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6
Q

what is present on each side of the oblique ridge on the upper first molar

A

a fissure

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7
Q

what are the two fissures on the upper first molar connected by and what does this look like

A

they are connected with another shallow fissure which gives rise to an H-shaped fissure pattern

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8
Q

where does the distal fissure on the upper first molar run?

A

parallel to the oblique ridge and continues to the palatal surface

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9
Q

what does the mesial fissure on the upper first molar look like?

A

it has a right-angled bend and one arm runs towards the mesial surface (but not on to it) while the other goes to the buccal surface

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10
Q

what is a tubercle of carabelli and where is it found?

A

it is an extra cusp and it is found on the palatal surface of the mesio-palatal cusp on the upper first molar

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11
Q

how many roots does an upper first molar have and where are they?

A

3 roots - 2 buccal and 1 palatal diverging from a common root stalk

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12
Q

what is significant about the disto-palatal cusp on the upper second molar?

A

it is greatly reduced and may be absent altogether which makes the shape of the crown more triangular

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13
Q

what is the shape of the upper second molar crown?

A

triangular/heart-shaped

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14
Q

what can be said about the roots of the upper second molars

A

they are much less divergent and the palatal root is often partially fused with either of the buccal roots

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15
Q

what is the crown of the upper third molar like and how many cusps does it have?

A

smallest of them all and usually only 3 cusps (no disto-palatal)

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16
Q

what are the roots of the upper third molar like?

A

usually fused together into one common bulky root with grooves where the usual furcations would be

17
Q

what is the smallest cusp on the lower first molar?

A

the distal cusp

18
Q

how many cusps does the lower first molar have?

A

5 - 3 buccal and 2 lingual

19
Q

where does the transverse fissure on the lower first molar run?

A

from the buccal surface to the lingual surface

20
Q

what causes the formation of a pit in the centre of the lower first molar crown?

A

the deepening of the transverse fissure

21
Q

what does the mesio-distal fissure do when it reaches the distal cusp

A

it bifurcates to pass onto each side of the distal cusp

22
Q

is the buccal or lingual surface of the lower first molar larger?

A

the buccal surface

23
Q

what shape are the proximal surfaces of the lower first molar?

A

convex with the distal much rounder because of the distal cusp

24
Q

how many roots does the lower first molar have?

A

2 - one mesial and one distal both compressed mesio-distally and may show distal curvature

25
Q

what is the mesial root of the lower first molar like?

A

curved, grooved and broader than the distal root making the distal root invisible from the mesial aspect

26
Q

which tooth has a buccal surface which has increased risk of caries?

A

lower 6

27
Q

what is the difference between the mesial and distal roots of the lower 7

A

mesial root is broader than the distal but the distal is longer

28
Q

comment on the occlusal surface of the lower 7 compared to the lower 6

A

the lower 7 is more symmetrical and smaller than the lower 6

29
Q

how many cusps does a lower second molar have?

A

4

30
Q

what is the shape of the occlusal surface of a lower 7

A

square shaped

31
Q

what is the fissure pattern on a lower second molar

A

+ shaped

32
Q

what is the largest cusp on the lower 7

A

mesio-buccal

33
Q

what are the highest cusps on the lower 7

A

lingual cusps

34
Q

what are the roots of the lower second molar like

A

less divergent and may be fused

35
Q

what is the crown of the lower third molar like

A

it is variable in size as it can have 5/4/3 cusps

36
Q

what are the roots of the third molar like?

A

often fused together

37
Q

when making dentures where should the mesio-palatal and disto-palatal cusps sit in occlusion?

A

mesio-palatal cusps should be on the occlusal plane and buccal cusps should be raised from the plane

Oral Biology BDS1 (16 decks)

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