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My BDS1 > Tooth Morphology > Flashcards

Tooth Morphology Flashcards

1
Q

What tooth has a distal border longer than the mesial border?

A

Canine

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2
Q

What canine is more diamond shaped? (Upper or lower)

A

Upper

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3
Q

What kind of tooth (upper) has a cingulum leaning distally?

A

Canine.

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4
Q

What tooth has the longest root?

A

The canines.

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5
Q

What tooth has 2 shallow fossae on the palatal surface of the upper jaw?

A

Canine.

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6
Q

What canine is more slender, smaller and symmetrical? Upper or lower?

A

Lower.

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7
Q

The lower canine is ?? inclined

A

Lingually

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8
Q

The features of a lower canine are.. in comparison to the upper. (Fossae/cingulum)

A

Less pronounced.

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9
Q

How many roots do upper first premolars have?

A

2

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10
Q

In an upper first premolar what cusp is bigger? (Buccal or palatal)

A

Buccal

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11
Q

What is the most distinctive feature in an upper first premolar?

A

Canine fossa.

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12
Q

What rule is applicable to all upper premolars?

A

The palatal tip is leaning mesially.

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13
Q

What is the mesial fissure like in an upper first premolar?

A

Fissure runs down and into the canine fossa.

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14
Q

How many roots do upper second premolars have?

A

1

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15
Q

In the upper second premolar; How do you differentiate the distal marginal ridge from the mesial marginal ridge?

A

Distal marginal ridge has a more deep and defined V shape.

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16
Q

What distinct feature does the upper second premolar lack in comparison to the upper first?

A

No canine fossa

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17
Q

In the lower first premolar; What cusp is higher?

A

Buccal

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18
Q

In the lower first premolar; What marginal ridge is a C shape?

A

Distal.

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19
Q

In the lower first premolar; The lingual tip is displaced..?

A

Distally.

20
Q

In the lower second premolar; what is the biggest cusp?

A

Mesial

21
Q

In the lower second premolar;Which marginal ridge is higher?

A

Mesial

22
Q

How many roots do upper molars have? Where are these roots situated?

A

3 roots.
2 x buccal.
1 x palatal.

23
Q

How many roots do lower molars have? Where are these roots situated?

A

2 roots.
1 x mesial.
1 x distal.

24
Q

What shape is the upper first permanent molar?

A

Diamond shaped.

25
Q

What tooth is the tubercle of carabelli on? What cusp is it superimposed on to?

A

Upper first permanent molar.

Mesial palatal cusp.

26
Q

On the first permanent molar; What small cusp is clearly separated by a fissure?

A

Distal palatal.

27
Q

What shape is the upper second permanent molar?

A

Triangle shaped.

28
Q

What is common in the roots of an upper second permanent molar?

A

Closer together.

The two buccal roots can merge.

29
Q

What is a characteristic of the upper second molar’s occlusal fissure?

A

The ‘H’ shape loses half of the distal arm.

30
Q

What is unique about the lower first permanent molar?

A

Only molar with 5 cusps.
3 x buccal.
2 x lingual.

31
Q

What root is bigger in a lower first permanent molar?

A

Mesial root.

32
Q

In the lower first permanent molar; what cusp is the smallest buccally? (Mesial or distal)

A

Distal

33
Q

How many cusps does a lower second permanent molar have?

A

4

34
Q

What is common to both the lower second and first permanent molar in terms of roots?

A

Mesial roots are wider.

35
Q

What kind of inclination do the buccal cusps have?

A

Lingual inclination

36
Q

What molar has a buccal fissure?

A

Lower first permanent molar

37
Q

What are the characterises of mesial and distal incisal edges of upper incisors?

A

Mesial angle is more sharp and the distal angle is much more rounded.

38
Q

Which upper incisor has a sharper mesial incised edge?

A

The central incisor.

39
Q

What can some new permanent incisors have?

A

Mammelons.

40
Q

What is common to all incisors regarding the cervical edge?

A

Mesial cervical line is much deeper. “undulation” is greater.

41
Q

What does the upper central incisor have on the palatal aspect?

A

A cingulum.

42
Q

What does the upper lateral incisor have on the palatal aspect?

A

A depression/fossa created by marginal ridges.

43
Q

Lower incisors are inclined in what direction?

A

Lingually inclined.

44
Q

How does the shape of the lower central incisor compare to the lateral incisor?

A

Central is more symmetrical.

Lateral is fan shaped. Disto-incisal edge flares.

45
Q

Name a defect of the incisors.

A

Peg laterals.

46
Q

Name the differences between first and second upper premolars.

A

Upper first premolar has 2 roots. Buccal cusp is much larger than palatal cusp.
Upper second premolar has 1 root. Both cusps are of similar heights.

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