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BDS1 > Tooth morphology > Flashcards

Tooth morphology Flashcards

1
Q

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

A

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

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2
Q

Which structures meet to form the cingulum?

A

Mesial and distal marginal ridges

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3
Q

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

A

Mesial cervical line is more undulated than distal

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4
Q

Which teeth have a cingulum?

A

anterior teeth but less pronounced in lowers

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5
Q

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

A

Upper lateral incisor (12,22)

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6
Q

Which is the most symmetrical anterior tooth?

A

Lower central incisors (41,31)

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7
Q

Feature of lower anteriors

A

lingually inclined

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8
Q

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

A

lower lateral incisor

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9
Q

Feature of incisal edge in youth

A

mammelons (3 cusplets)

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10
Q

Which tooth has the most prominent cingulum?

A

Upper canine (13,23) with 2 shallow fossae

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11
Q

Which teeth have a cuspid instead of an incisal edge?

A

canines

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12
Q

Which tooth has a palatal and labial ridge?

A

upper canine

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13
Q

How to distinguish between mesial and distal in canines?

A

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

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14
Q

Difference between mesial and distal contact points in upper canines

A

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

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15
Q

Which proximal side is smaller in canine?

A

Mesial side is smaller than distal

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16
Q

Longest and strongest tooth

A

upper canine

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17
Q

Difference in shape between upper and lower canines

A

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

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18
Q

Difference between upper and lower canines

A

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

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19
Q

Term used to describe canines leading jaw movement

A

canine guidance

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20
Q

On which sides are the 2 premolar roots?

A

Buccal and palatal

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21
Q

Which tooth has a canine fossa?

A

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

22
Q

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

A

upper first premolar (14, 24)

23
Q

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

A

buccal cusp is bigger than palatal cusp

24
Q

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

A

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

25
Q

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

A

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

26
Q

What percentage of upper second premolars have one root?

A

85% - deeply grooved distally

27
Q

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

A

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

28
Q

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

A

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

29
Q

Difference in shape between upper and lower premolars

A

upper premolars are more oval while lower premolars are more round

30
Q

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

A

Lower first premolars (44,34)

31
Q

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

A

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

32
Q

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

A

distal fossa larger than mesial fossa

33
Q

How many roots do upper molars have?

A

3 roots - 2 buccal, 1 palatal

34
Q

How many roots do lower molars have?

A

2 roots - mesial and distal

35
Q

Where may a tubercle of Carabelli be found?

A

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

36
Q

Which is the largest cusp in upper first molars?

A

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

37
Q

Where is an oblique ridge found?

A

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

38
Q

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

A

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

39
Q

Shape of upper first molars (16,26)

A

trapezoid

40
Q

Shape of upper second molars (17,27)

A

more triangular

41
Q

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

A

Disto-palatal cusp

42
Q

Which is the only tooth to have 5 cusps?

A

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

43
Q

Shape of lower molars

A

more rectangular

44
Q

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

A

Lower molars (47,46,36,37)

45
Q

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

A

distal cusp

46
Q

Which tooth usually has a buccal pit/fossa?

A

Lower first molar (46,36)

47
Q

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

A

+ shaped. 4 cusps

48
Q

Which tooth has a mesial hump?

A

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

49
Q

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

A

Buccal is convex, lingual is straight and higher

50
Q

Difference in roots between upper first and second molars?

A

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

51
Q

How many roots do lower premolars have?

A

1

BDS1 (24 decks)

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