Molars

Question 1

What is the shape of the occlusal surface of an upper first molar

Answer 1

Diamond shaped

Question 2

What is the largest cusp on the upper first molar

Answer 2

The mesio-palatal cusp

Question 3

What is the smallest cusp on the upper first molar

Answer 3

The distal-palatal cusp

Question 4

What is the longest diagonal on the occlusal surface of the upper first molar

Answer 4

It goes from the media-buccal to the disco-palatal cusp

Question 5

What is an oblique ridge

Answer 5

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

Question 6

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

Answer 6

A fissure

Question 7

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

Answer 7

They are connected with another shallow fissure which hives rise to an H shaped pattern

Question 8

Where does the distal fissure on the upper first molar run

Answer 8

Parallel to the oblique ridge and continues to the palatal surface

Question 9

What does the mesial fissure on the upper first molar look like

Answer 9

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

Question 10

What is a tubercle of caramel I and where is it found

Answer 10

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

Question 11

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

Answer 11

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

Question 12

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

Answer 12

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

Question 13

What is the shape of the upper second molar crown

Answer 13

Triangular/heart-shaped

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

What are the roots of the upper third molar like

Answer 16

Usually fused together into one common bulky root with grooves where the usual fractions would be

Question 17

What is the smallest cusp on the lower first molar

Answer 17

The distal cusp

Question 18

How many cusps does the lower first molar have

Answer 18

5 - 3 buccal and 2 lingual

Question 19

Where does the transverse fissure on the lower first molar run

Answer 19

From the buccal surface to the lingual surface

Question 20

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

Answer 20

The deepening of the transverse fissure

Question 21

What does the media-distal fissure do when it reaches the distal cusp

Answer 21

It bifurcated to pass onto each side of the distal cusp

Question 22

How many roots does the lower first molar have

Answer 22

2 - one mesial and one distal

Both compressed Mexico-distally and may show distal curvature

Question 23

What is the mesial root of the lower first molar like

Answer 23

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

Question 24

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

Answer 24

Lower 6

Question 25

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

Answer 25

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

Question 26

Compare the occlusal surface of the lower 7 compared to the lower 6

Answer 26

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

Question 27

How many cusps does a lower second molar have

Answer 27

4

Question 28

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

Answer 28

Square shaped

Question 29

What is the fissure pattern on a lower second molar

Answer 29

+ shaped

Question 30

What is the largest cusp on the lower 7

Answer 30

Mexico-buccal

Question 31

What are the highest cusps on the lower 7

Answer 31

Lingual cusps

Question 32

What are the roots of the lower second molar like

Answer 32

Less divergent and may be fused

Question 33

What is the crown of the lower third molar like

Answer 33

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

Question 34

What are the roots of the third molar like

Answer 34

Often fused together

Question 35

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

Answer 35

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

Question 36

What shape are the proximal surfaces of the lower first molar

Answer 36

Convex with the distal much rounder because of the distal cusp

Question 37

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

Answer 37

The buccal surface