7 - Primary Dentition

Question 1

This type of dentition is also known as “Interceptive orthodontics”

Answer 1

Mixed dentition

Question 2

How many deciduous teeth are there?

Answer 2

20

Question 3

How many teeth come from successional lamina?

Answer 3

20

Question 4

Primary detention + Permanent molars =

Answer 4

Mixed dentition

Question 5

What primary and permanent teeth make up “mixed dentition”?

Answer 5

Primary teeth + permanent molars

Question 6

What age range do permanent teeth erupt?

Answer 6

6 to 13

Question 7

How many permanent teeth are there?

Answer 7

32

Question 8

What teeth are typically the last to erupt according to retrouvey for primary teeth?

Answer 8

Canines

Question 9

Do permanent or primary dentitions have symmetrical crown shapes?

Answer 9

Primary

Question 10

Do primary or permanent teeth have more variability?

Answer 10

Permanent

Question 11

What are the characteristics of deciduous teeth?

Answer 11

1. Symmetrical crown shapes
2. Interdental shaping
3. No angulation of incisors
4. Less variability than permanent
5. Arch width changes with growth

Question 12

What are interdental spaces called?

Answer 12

Diastemas

Question 13

If you have poor malocclusion in primary teeth, does the condition improve with permanent teeth?

Answer 13

No, it worsens

Question 14

Is having interdental spacing or “diastemas” good?

Answer 14

Yes

Question 15

Why is having interdental spacing good?

Answer 15

Permanent incisors require much more space

Question 16

What spaces are found mesial to the upper cuspids and distal to lower cuspids in primary dentition?

Answer 16

Primate spaces

Question 17

In what dentition are “Primate spaces” found?

Answer 17

Primary dentition

Question 18

Where are “Primate spaces” found?

Answer 18

Mesial to upper cuspid
Distal to lower cuspid

Question 19

What will occur if there are NO interdental spaces in the deciduous dentition?

Answer 19

Crowing of permanent teeth (75%)

Question 20

________ between anterior primary teeth are important for permanent incisor eruption

Answer 20

Diastemas

Question 21

How do the upper and lower incisors of primary teeth tend to erupt?

Answer 21

Upper incisors = labial
Lower incisors = lingual

Question 22

When upper incisors erupt labial, what do they do to the arch?

Answer 22

Increase size

Question 23

Which arch is known as the “diagnostic” arch?

Answer 23

mandibular

Question 24

Are there increases in arch size during the eruption of permanent incisors?

Answer 24

No

Question 25

Do eruptions of permanent incisors cause an increase in arch size?

Answer 25

No

Question 26

Are primary teeth smaller or larger than permanent?

Answer 26

Anterior primary = smaller Molars = larger

Question 27

What is the largest tooth in primary dentition?

Answer 27

2nd primary molar

Question 28

Which primary teeth are typically larger than permanent teeth?

Answer 28

Posterior teeth

Question 29

Which primary teeth are typically smaller than permanent teeth?

Answer 29

Anterior teeth

Question 30

What is the size of the Upper second premolar?

Answer 30

7mm

Question 31

What is the size of the Upper second primary premolar?

Answer 31

8.2mm

Question 32

What is the size of the Lower second premolar?

Answer 32

7mm

Question 33

What is the size of the Lower second primary premolar?

Answer 33

10mm

Question 34

This is an imaginary surface that passes through the occlusion of the teeth

Answer 34

Occlusal plane

Question 35

The maxillary occlusal plane passes through what?

Answer 35

Occlusal cusps of posterior teeth and incisal edges of maxillary incisors

Question 36

The mandibular occlusal plane passes through what?

Answer 36

Tangent to the occlusal cusps of posterior teeth and incisal edges of incisors

Question 37

How are primary teeth positioned to the occlusal plane?

Answer 37

90*

Question 38

Are primary or permanent teeth positioned 90 degrees to the occlusal plane?

Answer 38

Primary teeth

Question 39

What is the curve of spee in the primary dentition?

Answer 39

Flat

Question 40

If there is a Curve of spee present in primary teeth, what will occur?

Answer 40

Severe malocclusion

Question 41

Dentoalverolar compensations are __________ in deciduous dentition

Answer 41

Not fully expressed

Question 42

Why is there less variability in occlusal relationships with deciduous dentition?

Answer 42

Dentoalveolar compensation is not fully expressed

Question 43

If a malocclusion is diagnosed in the primary dentition, it will most probably get _____ during growth

Answer 43

Worse

Question 44

What are the occlusal relationships in deciduous dentition?

Answer 44

1. Upper and lower incisors are vertical 2. Minimal overbite and overjet 3. Upper canine tip is positioned in the embrasure between the lower canine and the first primary molar

Question 45

What class of occlusion do deciduous teeth typically have?

Answer 45

Class 1

Question 46

What % of coverage does overbite have on primary teeth?

Answer 46

10-30%

Question 47

What overjet does primary dentition have?

Answer 47

1-2mm

Question 48

In deciduous dentition, normal occlusal changes are due to what?

Answer 48

Skeletal growth

Question 49

In deciduous dentition, are normal occlusal changes due to dental changes?

Answer 49

no

Question 50

What is an ectopic dental eruption?

Answer 50

Teeth erupt in wrong place

Question 51

Can an ectopic dental eruption lead to malocclusion?

Answer 51

Yes

Question 52

Are missing primary teeth common?

Answer 52

No, they are rare

Question 53

Are missing permanent teeth common?

Answer 53

Yes