Tooth morphology

Question 1

Difference between mesio-incisal and disto-incisal edge in incisors

Answer 1

mesio-incisal edge is sharper than the rounder disto-incisal edge

Question 2

Which structures meet to form the cingulum?

Answer 2

Mesial and distal marginal ridges

Question 3

How to differentiate between mesial and distal of incisors and canines using the cervical line

Answer 3

Mesial cervical line is more undulated than distal

Question 4

Which teeth have a cingulum?

Answer 4

anterior teeth but less pronounced in lowers

Question 5

Which tooth may have a fossa due to pronounced marginal ridges meeting on the palatal surface?

Answer 5

Upper lateral incisor (12,22)

Question 6

Which is the most symmetrical anterior tooth?

Answer 6

Lower central incisors (41,31)

Question 7

Feature of lower anteriors

Answer 7

lingually inclined

Question 8

Which tooth has a fan shaped crown with a distal flare?

Answer 8

lower lateral incisor

Question 9

Feature of incisal edge in youth

Answer 9

mammelons (3 cusplets)

Question 10

Which tooth has the most prominent cingulum?

Answer 10

Upper canine (13,23) with 2 shallow fossae

Question 11

Which teeth have a cuspid instead of an incisal edge?

Answer 11

canines

Question 12

Which tooth has a palatal and labial ridge?

Answer 12

upper canine

Question 13

How to distinguish between mesial and distal in canines?

Answer 13

cervical undulation. Mesial border is shorter and less steeply inclined than distal. Mesial contact point is more incisal than distal contact point.

Question 14

Difference between mesial and distal contact points in upper canines

Answer 14

mesial contact point is more incisally located (lower) than distal contact point (higher) which is in the centre of the crown.

Question 15

Which proximal side is smaller in canine?

Answer 15

Mesial side is smaller than distal

Question 16

Longest and strongest tooth

Answer 16

upper canine

Question 17

Difference in shape between upper and lower canines

Answer 17

upper canine is more spade-like, while lower canine is more slender

Question 18

Difference between upper and lower canines

Answer 18

lower canines are lingually inclined and have a flatter labial surface (like lower incisors). Crown is at an angle to the root while in upper canines the crown is straight. Upper canines are more spade-like

Question 19

Term used to describe canines leading jaw movement

Answer 19

canine guidance

Question 20

On which sides are the 2 premolar roots?

Answer 20

Buccal and palatal

Question 21

Which tooth has a canine fossa?

Answer 21

Upper first premolar (14,24) - concave mesial surface

Question 22

In which tooth does the central groove usually extend over the mesial marginal ridge?

Answer 22

upper first premolar (14, 24)

Question 23

in upper first premolars what is the difference in cusp size?

Answer 23

buccal cusp is bigger than palatal cusp

Question 24

in upper second premolars what is the difference in cusp size?

Answer 24

buccal and palatal cusps are similar in size (buccal cusp reduced)

Question 25

Which teeth have a mesial displacement of the palatal / lingual cusp?

Answer 25

Upper first premolars (14,24), upper second premolars (slightly - 14,25), lower second premolar if only one lingual cusp is present (45,35)

Question 26

What percentage of upper second premolars have one root?

Answer 26

85% - deeply grooved distally

Question 27

Which premolars have a more cervical distal marginal ridge than mesial?

Answer 27

Upper first (14,24), upper second (15,25), lower second (45, 35)

Question 28

Which premolars have a more cervical mesial marginal ridge than distal?

Answer 28

Only lower first premolars (44, 34) - small groove runs from mesial pit to mesio-lingual surface

Question 29

Difference in shape between upper and lower premolars

Answer 29

upper premolars are more oval while lower premolars are more round

Question 30

Which tooth has a narrow, flat, bucally-pushed mesial contact point compared to a more rounded, wider distal contact point?

Answer 30

Lower first premolars (44,34)

Question 31

Which tooth either has one lingual cusp or two lingual cusps?

Answer 31

Lower second premolar (45, 35) - either mesially-displaced large lingual cusp or a large mesio-lingual cusp and a small disto-lingual cusp

Question 32

Which fossa is larger in lower second premolars? (45,35)

Answer 32

distal fossa larger than mesial fossa

Question 33

How many roots do upper molars have?

Answer 33

3 roots - 2 buccal, 1 palatal

Question 34

How many roots do lower molars have?

Answer 34

2 roots - mesial and distal

Question 35

Where may a tubercle of Carabelli be found?

Answer 35

On the mesio-palatal cusp of upper first molar (16,26)

Question 36

Which is the largest cusp in upper first molars?

Answer 36

mesio-palatal cusp is largest, disto-palatal cusp is smallest

Question 37

Where is an oblique ridge found?

Answer 37

Extending from the mesio-palatal cusp to the disto-buccal cusp of upper first molar (16,26)

Question 38

Shape of fissure in upper first molar (16,26)

Answer 38

H - distal fissure parallel to oblique ridge, mesial fissure has a right angled bend

Question 39

Shape of upper first molars (16,26)

Answer 39

trapezoid

Question 40

Shape of upper second molars (17,27)

Answer 40

more triangular

Question 41

Which cusp is greatly reduced in upper second molars (17,27)?

Answer 41

Disto-palatal cusp

Question 42

Which is the only tooth to have 5 cusps?

Answer 42

Lower first molar (46,36) - 3 buccal, 2 lingual

Question 43

Shape of lower molars

Answer 43

more rectangular

Question 44

In which teeth is the mesial root wider than the distal root?

Answer 44

Lower molars (47,46,36,37)

Question 45

Which is the smallest cusp in lower first molars (46,36)?

Answer 45

distal cusp

Question 46

Which tooth usually has a buccal pit/fossa?

Answer 46

Lower first molar (46,36)

Question 47

Shape of fissure in lower second molar (47,37)

Answer 47

+ shaped. 4 cusps

Question 48

Which tooth has a mesial hump?

Answer 48

Lower second molar (47,37) - mesio-buccal cusp is largest.

Question 49

Difference in buccal and lingual surface of lower second molar (47,37)?

Answer 49

Buccal is convex, lingual is straight and higher

Question 50

Difference in roots between upper first and second molars?

Answer 50

Both have 3 roots. Roots are less divergent in upper second molar (17,27)

Question 51

How many roots do lower premolars have?

Answer 51

1