Tooth eruption & comparison Flashcards

1
Q

By what age should all deciduous teeth have erupted?

A

by 2.5 - 3 years

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2
Q

What is the general rule about deciduous teeth eruption?

A

Lowers before uppers, except for lateral incisors

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3
Q

How long does complete apexogenesis taken after decidious tooth eruption?

A

around 1.5 years after eruption

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4
Q

What is the eruption pattern in deciduous teeth?

A

1 2 4 3 5

A B D C E

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5
Q

When do upper deciduous central incisors erupt?

A

8-12 months

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6
Q

When do upper deciduous lateral incisors erupt?

A

9-13 months

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7
Q

When do upper deciduous canines erupt?

A

16-22months

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8
Q

When do upper deciduous first molars erupt?

A

13-19months

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9
Q

When do upper deciduous second molars erupt?

A

23-33 months

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10
Q

When do lower deciduous central incisors erupt?

A

6-10 months

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11
Q

When do lower deciduous lateral incisors erupt?

A

10-16 months

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12
Q

When do lower deciduous canines erupt?

A

17-23 months

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13
Q

When do lower deciduous first molars erupt?

A

14-18 months

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14
Q

When do lower deciduous second molars erupt?

A

23-31 months

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15
Q

Between what ages is the ‘mixed dentition stage’?

A

6-11 years

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16
Q

What is the general rule for permanent tooth eruption?

A

Lowers before uppers except 2nd premolars

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17
Q

What is the eruption pattern for upper permanent teeth?

A

6 1 2 4 5 3 7 8

18
Q

What is the eruption pattern for lower permanent teeth?

A

6 1 2 3 4 5 7 8

19
Q

In permanent teeth, how long after eruption does it take for root formation to complete?

20
Q

When do upper permanent central incisors erupt?

21
Q

When do upper permanent lateral incisors erupt?

22
Q

When do upper permanent canines erupt?

A

11-12 years

23
Q

When do upper permanent first premolars erupt?

A

10-11 years

24
Q

When do upper permanent second premolars erupt?

A

10-12 years

25
When do upper permanent first molars erupt?
6-7 years
26
When do upper permanent second molars erupt?
12-13 years
27
When do upper permanent third molars erupt?
17-21 years
28
When do lower permanent central incisors erupt?
6-7 years
29
When do lower permanent lateral incisors erupt?
7-8 years
30
When do lower permanent canines erupt?
9-10 years
31
When do lower permanent first premolars erupt?
10-12 years
32
When do lower permanent second premolars erupt?
11-12 years
33
When do lower permanent first molars erupt?
6-7 years
34
When do lower permanent second molars erupt?
11-13 years
35
When do lower permanent thirds molars erupt?
17-21 years
36
How do deciduous crowns differ from the crowns of permanent teeth?
- primary incisors are smaller in root & crown proportions - primary molars are wider mesiodistally than permanent premolars which replace them - Primary molar crowns are more bulbous - primary teeth are usually whiter in colour
37
How do deciduous and permanent teeth differ re: roots?
- primary roots tend to be narrower - primary molar roots are longer & more slender, they tend to flare apically to allow room inbetween for developing permanent tooth crowns
38
How do deciduous and permanent teeth differ re: pulps?
- Primary dentition have relatively large pulp chambers | - pulp horns of primary dentition extend high occlusally - hence pulpal exposure more likely
39
How do deciduous and permanent root canals differ?
- Primary root canals tend to be ribbon shaped | - primary root canals are clinically impossible to clean completely
40
How do deciduous and permanent hard tissues differ?
- coronal dentine is much thinner than permanent | - primary enamel is relatively thin and has a consistent depth
41
How do deciduous and permanent occlusions differ?
- anterior spacing is desired (= no crowdin in permanent dentition) - deciduous incisors are upright, permanent incisors are proclined, leading to an increase in A-P archlength
42
What is leeway space in deciduous teeth?
Extra space mesio-distal space occupied by primary molars, wider than the replacing permanent pre-molars - usually equates to 1.5mm eather side in upper arch, 2.5mm lower arch