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Dental Morphology > Primary Dentition > Flashcards

Primary Dentition Flashcards

1
Q

When does calcification begin

A

4-6months in utero

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2
Q

When does eruption begin

A

6-24 months

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3
Q

When does dentition fully erupt

A

By 2.5-3 years

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4
Q

When is root formation completed

A

1 year after eruption

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5
Q

When does root resorption begin

A

1 year after eruption

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6
Q

When are primary teeth replaced by permanent dentition

A

From 6-12 years old

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7
Q

Which primary tooth is larger than its successor

A

Mesio-distal width of deciduous molar>that of succeeding premolars

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8
Q

How does deciduous pulp chamber compare to permanent

A

Larger

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9
Q

Where do enamel rods in gingival 1/3 of primary dentition slope

A

occlusally rather than towards gingiva

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10
Q

What is the difference between #51 and #11

A 
#51 Smaller and crown more bulbous
#51 no mammelon
#51 pulp tissue closer to surface
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11
Q

Where does apical 1/2 of root of #51 incline?

A

Labially to allow #11 to develop

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12
Q

How many pulp horns does #51 have

A

2 (mesial and distal)

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13
Q

Difference between #51 and #52 angles

A

Mesio-incisal angle more acute in #52

Disto-incisal angle more rounded in #52

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14
Q

How would you describe the shape of #53

A

Symmetrical crown with fang-like appearance, viewed labially/ palatally, crown appears diamond-shaped

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15
Q

Is #53 wider or longer

A

Wider

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16
Q

How many cusps does #54 have

A

2-4.
Buccal (more prominent) and palatal are the main cusps, but both can be divided into mesial (larger)
and distal

17
Q

What can be observed on mesio-buccal aspect of #54 and #84

A

Tubercle of Zuckerkandl- large bulge of enamel towards cervical margin

18
Q

How many roots does #54 have

A

3 divergent roots:
Palatal (round and largest)
Mesio-buccal (flattened mesiodistally)
Disto-buccal (Smallest, most curved)

19
Q

How many pulp horns are there in #54

A

Well developed pulp horns to 2 main cusps, with additional pulp horns to additional cusps

20
Q

How many cusps does #55 have

A 
4:
Mesiobuccal
Distobuccal
Mesiopalatal
Distopalatal
21
Q

What is a special feature of #55

A

Cusp of Carabelli at mesiopalatal

22
Q

How many roots does #55 have

A

3 divergent roots: mesiobuccal, distobuccal and palatal

23
Q

How many root canals and pulp horns does #81 have

A

1; 2 (mesial and distal pulp horn)

24
Q

What shape does #82 have

A

Crown is assymetrical; fanshaped
Mesio-incisal angle is sharp and actue
Disto-incisal angle is rounded

25
Q

Is the crown of #83 convex, concave or flat labially

A

convex

26
Q

Is #83 symmetrical

A

Asymmetrical, with mesial slope shorter than distal slope

27
Q

Is it true that the pulp and root canal are well defined in deciduous teeth

A

False

28
Q

How many roots does #83 have

A

1, triangular in cross-section

29
Q

How many fossa does #83 have lingually

A

It has two fossa, mesial and distal with a ridge connecting the cusp tip to the cingulum

30
Q

How would you describe the shape of #84 on the occlusal surface

A

Elongated mesio-distally forming an irregular rectangle

31
Q

How many cusps does #84 have

A

4;2 buccal and 2 lingual cusps, Mesial cusps larger than distal cusps

32
Q

Does #84 have a transverse ridge

A

Yes, it has a transverse ridge from the mesio-buccal to mesio-lingual cusp resulting in a small mesial fossa and big distal fossa (due to larger size of mesial cusps)

33
Q

How many roots does #84 have

A

2 divergent roots, mesial and distal both flattened mesio distally, mesial root is often grooved

34
Q

How many root canals in mesial root of #84

A

2

35
Q

Rank size of pulp horns in each cusp of #84

A

Largest MB (due to tubercle of Zuckerkandl)
ML (Mesial cusp larger)
DB
Smallest DL

36
Q

Which permanent tooth is #85 most similar to

A

46; #85 is smaller and narrower with a more pronounced cervical ridge on the buccal surface

37
Q

How many cusps does #85 have

A

5 (3 buccal and 2 lingual), one pulp horn per cusp

38
Q

How many roots does #85 have

A

2 divergent roots, mesial and distal both flattened mesio distally

39
Q

How many root canals does #85 have

A

3; 2 mesial and 1 distal

Dental Morphology (2 decks)

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