8 - Mixed Dentition

Question 1

What term is used for when permanent incisors are larger than primary incisors the replace?

Answer 1

Incisor liability

Question 2

Upper permanent incisors erupt ____ to primary teeth

Answer 2

Labial

Question 3

Lower permanent incisors erupt ____ to primary teeth

Answer 3

Lingual

Question 4

Do you gain or lose size in the mandible when permanent teeth erupt?

Answer 4

Lose size

Question 5

What are the different dental arch measurements?

Answer 5

Arch length
Arch width
Arch perimeter
Intercanine distance

Question 6

This is measured at the midline to a tangent touching the distal surface of the 2nd primary molars

Answer 6

Arch length

Question 7

When is the arch length stable?

Answer 7

Once primary incisors erupt

Question 8

How do you get growth in arch length?

Answer 8

Displacement in space

Question 9

How is dental arch width/intercanine distance measured?

Answer 9

1. Between cusps of canines in the transverse plane
2. Between occlusal grooves of the 2nd primary molars
3. Between occlusal grooves of the permanent 1st molars

Question 10

You get no change of intercanine distance after what age?

Answer 10

10-11

Question 11

How much distance is gained in the arches and intercanine distance from 4-10 years?

Answer 11

4mm

Question 12

This is measured from the distal surface of the 2nd primary molar around the arch over the contact points and incisal edges in a smoothed curve

Answer 12

Arch perimeter

Question 13

What is used as a “baseline” of the arch before treatment?

Answer 13

Dental arch perimeter

Question 14

Does elongation of the roots have something to do with tooth eruption?

Answer 14

No

Question 15

What age range do you get mixed dentition?

Answer 15

6-13 years

Question 16

What is the 1st permanent tooth to erupt that is “non-succedaneous”?

Answer 16

1st molar

Question 17

Describe primary root resorption

Answer 17

1. Crown of permanent tooth is formed
2. Root develops and primary tooth starts to resorb
3. When root is fully resorb, permanent tooth erupts

Question 18

Does permanent tooth eruption of primary root resorption occur 1st?

Answer 18

Resorption

Question 19

When does a permanent tooth erupt?

Answer 19

When primary root has fully resorbed and exfoliated

Question 20

When will the permanent tooth stop erupting?

Answer 20

When it reaches the occlusal plane

Question 21

At what age would be the best to take a panorex?

Answer 21

Around 8

Question 22

What is the variability in tooth replacement?

Answer 22

Sequence
Timing
Position
Numbers

Question 23

In what percentage of the population are their congenitally missing teeth?

Answer 23

3-5%

Question 24

What is the most frequently missing tooth in caucasians?

Answer 24

Maxillary lateral incisor

Question 25

What are the most frequently missing teeth in the Asian population?

Answer 25

Lower central incisor (1)
Lower lateral incisor (2)

Question 26

What 2 things can a missing primary tooth mean?

Answer 26

1. No permanent successor
2. Delayed eruption

Question 27

This refers to the fusion of part of the root of a primary tooth to the underlying bone which stops the tooth from erupting

Answer 27

Ankylosis

Question 28

Ankylosis becomes more evident in

Answer 28

Mixed dentition

Question 29

What is the treatment for ankylosis?

Answer 29

Monitor teeth as they 50% self-forrect
If it doesn’t exfoliate, extract