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Tooth Morphology > Deciduous teeth > Flashcards

Deciduous teeth Flashcards

1
Q

What are the main differences between primary and secondary teeth? (6)

A
  1. Primary teeth are smaller
  2. Enamel is whiter and more opaque
  3. Enamel is more permeable and prone to wear
  4. Depth of enamel is more consistent and thinner
  5. More pronounced cervical margin with bulging enamel (instead of tapering gently at the cementum-enamel junction)
  6. Coronally bulbous (crowns)
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2
Q

How do the roots of primary teeth compare to secondary roots?

A

Primary teeth have shorter, weaker and lighter coloured roots.

Prominent pulp horns, with relatively large pulp chambers.

Very fine root canals

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3
Q

How does the appearance of a primary central incisor compare to the appearance of secondary central incisors?

A

The crown and root form is similar in primary and secondary - but smaller scale in primary.

Crown mesiodistal width is larger than cervico-incisal length.

Rounder, fuller, shovel-shaped crown

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4
Q

Describe the root of a primary maxillary central incisor

A

Tilts towards the distal, and slightly tilts labially.

Tapers to blunt apex

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5
Q

Describe the palatal and labial surface of the primary maxillary central incisor

A

Palatal - Large cingulum

Labial - pronounced bulge

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6
Q

Describe the appearance of a primary upper central incisor

A
  • DI angle rounded
  • MI angle sharp
  • crown is small and plump
  • MD and CI dimensions are nearly the same (almost a rounded square shape)
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7
Q

Which primary tooth is the smallest?

A

The lower (Md) primary central incisor

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8
Q

Describe the primary lower central incisor root

A
  • Single root
  • Tapered
  • More rounded than the secondary incisior
  • Distal incline
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9
Q

On which side is the cervical margin most curved on a primary lower central incisor?

A

Mesial side

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10
Q

On which surface of a primary lower central incisor is there a bulge at the CEJ?

A

Labial surface

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11
Q

How would you describe the shape of the crown on a primary lower central incisor?

A

Chisel shaped

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12
Q

How does the primary upper lateral incisor compare to the primary central incisor?

A

Smaller and narrower

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13
Q

On which side is the cervical margin most curved on a primary upper lateral incisor?

A

Mesial

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14
Q

Describe the appearance of a primary upper lateral incisor

A

DI angle rounded
MI angle sharp
Less pronounced palatal cingulum

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15
Q

Describe the appearance of the lower primary lateral incisors

A
  • DI angle rounded
  • MI angle sharp
  • Larger than the lower central incisor
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16
Q

Describe the root of the lower lateral incisor

A
  • single
  • tapered
  • round cross section
  • distally incline
  • generally longer than lower central incisor roots
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17
Q

How does the lingual surface of the lower lateral incisor compare to the lower primary central incisor?

A

The lingual surface of the lower lateral incisor is more concave

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18
Q

How would you describe the crown and appearance of the upper primary canine?

A
  • Mesial slope is longer than the distal slope
  • Conical crown
  • Pronounced cervical bulge
  • Pointed cusp
  • Cervical margin extends further incisally on mesial surface than on distal surface
19
Q

How does the crown of the primary upper canine compare to the secondary upper canine?

A

The primary crown is smaller and more bulbous

20
Q

Describe the occlusal of the upper primary canine

A
  • Diamond shape with rounded corners

- Labial and palatal longitudinal ridges extending from cusp tip

21
Q

Describe the root of the upper primary canine

A
  • Distal incline
  • Slender tapering single root
  • twice the length of crown
  • Triangular cross section
22
Q

How does the lower primary canine compare in size to the upper primary canine?

A

The lower primary canine is smaller and slimmer in comparison

23
Q

Describe the root of the lower primary canine

A
  • Single root
  • Tapered
  • Distal incline
  • Slight labial incline
24
Q

Describe the characteristics of the crown of the primary lower canine

A
  • Distal slope longer than mesial slope (opposite to max. prim. canine)
  • Lingual surface is concave
  • Labial and lingual longitudinal ridges; lingual ridge often completely absent
    cervical margin more curved on mesial side
25
Q

On which tooth would you find the Tubercle of Zuckerkandl?

A

The primary first molars (upper and lower)

26
Q

What is a tubercle of Zuckerkandl?

A

Pronounced bulge on mesial side of buccal surface, considerable cervical constriction

27
Q

How would you describe the occlusal aspect of the upper primary first molar?

A
  • Narrow occlusal surface mesiodistally
  • Trapezoid coronal outline
  • Palatal mesiodistal surface shorter than buccal surface
  • Widest labiopalatal crown measurement at mesial end
28
Q

Which cusp of the upper primary first molar is the largest and most pointed?

A

Mesiopalatal cusp

29
Q

How many roots does the upper primary first molar have; how would these be described?

A

3 roots that are widely divergent

30
Q

How many cusps does the lower primary first molar have?

A

4 cusps

31
Q

How would you describe the buccal cusps of the lower primary first molar

A

compressed labiolingually with no clear separation between cusps

32
Q

How would you describe the lingual cusps of the lower primary first molar

A

Lingual cusps are clearly defined and roughly conical in shape

33
Q

Which cusp of the lower primary first molar is largest?

A

The mesiobuccal cusp

34
Q

Which marginal ridge of the lower primary first molar is more pronounced?

A

The mesial marginal ridge is more pronounced than distal

35
Q

Which part of the lower primary first molar is longer/wider- the mesiodistal or the labiolingual aspect?

A

The tooth is longer mesiodistally than labiolingually

36
Q

How many roots does the lower primary first molar have? What are the characteristics of this root/these roots?

A

2 roots.

  • Flattened mesiodistally.
  • Mesial root is longer.
  • From the mesial aspect, the root appears rectangular and is often grooved.
37
Q

Although the upper primary second molar is a smaller-scale duplicate of the primary upper first molar - what characteristic could you use to differentiate between the two?

A

More prominent bulge on the cervical part of the buccal surface.
Cusp of carabelli present in most cases.

38
Q

How many roots does the maxillary primary second molar have? How do these compare to the max first molar?

A

3 roots. These have a wider divergence than the max prim first molar

39
Q

On which surface would you find the cusp of carabelli?

A

The palatal surface- on the Mesiopalatal cusp

40
Q

The lower primary second molar is a duplicate of the primary lower first molar as the cusps and roots are arranged the same. However, in what way do they differ from each other?

A

The second molar is larger than the first molar

41
Q

How does the lower PRIMARY second molar compare to the lower SECONDARY second molar?

A

The primary is smaller and whiter

42
Q

How would you characterise the buccal surface of the lower primary second molar

A

Prominent cervical bulge on buccal surface of crown.
Nuccal surface lingually inclined.
Buccal cusps nearly equal in size.

43
Q

How would you describe the roots of the lower primary second molar?

A

2 roots, widely divergent. Mesial root is longer and flattened mesodistally.

44
Q

What shape is the occlusal outline of the lower primary second molar?

A

Rectangular

Tooth Morphology (8 decks)

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