Development of the permanent dentition

Question 1

What dentition has a more variable eruption sequence?

Answer 1

permanent

Question 2

Girls are ahead of boys in calcification and except for the third molars, girls are ahead of boys by an average of ___ months in eruption

Answer 2

5

Question 3

What is the sequence of eruption of permanent teeth in the mandibular arch?

Answer 3

First molar
Central Incisor
Lateral Incisor
Canine
First premolar
Second Premolar
Second Molar
Third Molar

Question 4

What is the sequence of eruption of permanent teeth in the maxillary arch?

Answer 4

First Molar
Central Incisor
Lateral Incisor
First Premolar
Second Premolar
Canine
Second Molar
Third Molar

Question 5

When does the mand first molar erupt?

permanent

Answer 5

6-7 years

Question 6

When does the mand central incisor erupt?

permanent

Answer 6

6-7 years

Question 7

When does the mand lateral incisor erupt?

permanent

Answer 7

7-8 years

permanent

Question 8

When does the mand canine erupt?

permanent

Answer 8

9-10 years

permanent

Question 9

When does the mand first premolar erupt?

permanent

Answer 9

10-12 years

permanent

Question 10

When does the mand second premolar erupt?

permanent

Answer 10

11-12

Question 11

When does the mand second molar erupt?

permanent

Answer 11

11-13

permanent

Question 12

When does the mand third molar erupt?

permanent

Answer 12

17-21

permanent

Question 13

When does the max first molar erupt?

permanent

Answer 13

6-7

permanent

Question 14

When does the max central incisor erupt?

permanent

Answer 14

7-8

Question 15

When does the max lateral incisor erupt?

permanent

Answer 15

8-9

Question 16

When does the max first premolar erupt?

permanent

Answer 16

10-11

Question 17

When does the max second premolar erupt?

permanent

Answer 17

10-12

Question 18

When does the max canine erupt?

permanent

Answer 18

11-12

Question 19

When does the max second molar erupt?

permanent

Answer 19

12-13

Question 20

When does the max third molar erupt?

permanent

Answer 20

17-21

Question 21

Timing is consistent within a dentition – children who erupt any tooth early or late tend to acquire others…

Answer 21

early or late

Question 22

True/false

Both sides should erupt at the same time (approximately)

Answer 22

True

Question 23

Different eruption sequences explain most frequently crowded teeth:

Answer 23

maxillary cuspids and mandibular second bicuspids

Question 24

What local influence can accelerate permanent tooth eruption?

Answer 24

If the primary tooth is extracted during active eruption of permanent tooth (more than 2/3 of the root formed)

Question 25

What local influence can slow permanent tooth eruption?

Answer 25

When a primary tooth is extracted before active eruption of permanent tooth (i.e. before root formation)

Question 26

The increases in arch width are tied to...

Answer 26

alveolar process growth (dental eruption and vertical process growth)

Question 27

What is vertical alveolar process growth?

Answer 27

* Occurs during general growth “spurts” * Different for maxilla and mandible: divergent maxillary process translates into more arch width growth

Question 28

How does dental eruption lead to increase in arch width?

Answer 28

* Wider placement of the permanent teeth * Apposition of alveolar bone to support these teeth will result in increase in arch width

Question 29

How does the maxillary arch grow?

Answer 29

* Increases occur during growth spurts * Increases occur during eruption of incisors * Large increase occurs during eruption of the cuspids

Question 30

How does the arch perimeter change in the maxillary arch?

Answer 30

▪ Variable (depends on pattern of tooth eruption) ▪ Not difference between sexes ▪ Factors which limit loss include greater labial angulation of incisors, greater increases in arch width and smaller leeway space

Question 31

What is this picture showing?

Answer 31

arch perimeter

Question 32

Teeth erupt lingual... what moves them forward labially?

Answer 32

the tongue

Question 33

As dentists, we are continually faced with the dilemma: What do we do in the case of moderate crowding of the teeth?

Answer 33

- you have to decide whether or not to extract teeth to reduce crowding (create more space) - expand the palate (create more space) | cannot expand mandible because it fuses shortly after birth (1 year)

Question 34

What is the arch perimeter?

Answer 34

the distance from the mesial point of the first molar on one side to the mesial point of the first molar on the other side

Question 35

What type of curve of spee is this?

Answer 35

normal | 2-3 mm is normal

Question 36

What type of curve of spee is this?

Answer 36

steep | greater than 2-3 mm

Question 37

Extraction of third molars to avoid orthodontic relapse has a _____ correlation

Answer 37

weak

Question 38

What do you do about third molars?

Answer 38

Prophylactic extraction of impacted teeth is a reasonable option.