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Oral Biology 1 > Molars > Flashcards

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 distal-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 media-buccal to the disco-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 fissures on the upper first molar connected by and what does this look like

A

They are connected with another shallow fissure which hives rise to an H shaped 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 it) while the other goes to the buccal surface

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10
Q

What is a tubercle of caramel I 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 fractions 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 media-distal fissure do when it reaches the distal cusp

A

It bifurcated to pass onto each side of the distal cusp

22
Q

How many roots does the lower first molar have

A

2 - one mesial and one distal

Both compressed Mexico-distally and may show distal curvature

23
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

24
Q

Which tooth has a buccal surface which is at increased risk of caries

A

Lower 6

25
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

26
Q

Compare 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

27
Q

How many cusps does a lower second molar have

A

4

28
Q

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

A

Square shaped

29
Q

What is the fissure pattern on a lower second molar

A

+ shaped

30
Q

What is the largest cusp on the lower 7

A

Mexico-buccal

31
Q

What are the highest cusps on the lower 7

A

Lingual cusps

32
Q

What are the roots of the lower second molar like

A

Less divergent and may be fused

33
Q

What is the crown of the lower third molar like

A

It is variable in size as it can have 3-5 cusps

34
Q

What are the roots of the third molar like

A

Often fused together

35
Q

When making dentures where should the mediocre-palatal and disto-palatal cusps sit in occlusion

A

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

36
Q

What shape are the proximal surfaces of the lower first molar

A

Convex with the distal much rounder because of the distal cusp

37
Q

Is the buccal or lingual surface of the lower first molar largest

A

The buccal surface

Oral Biology 1 (11 decks)

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