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
Latearl Incisor
First Premolar
Second Premolar
Canine
Second Molar
Third Molar

Question 5

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

Answer 5

early or late

Question 6

True/false

Both sides should erupt at the same time (approximately)

Answer 6

True

Question 7

Different eruption sequences explain most frequently crowded teeth:

Answer 7

maxillary canine
mandibular 2PM

Question 8

What local influence can accelerate permanent tooth eruption?

Answer 8

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

Question 9

What local influence can slow permanent tooth eruption?

Answer 9

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

Question 10

The increases in arch width are tied to…

Answer 10

alveolar process growth (dental eruption and vertical process growth)

As you grow, you have changes in all 3 planes of space (width, height, ant-post position - transverse, sagittal, vertical)

Question 11

How does dental eruption lead to increase in arch width?

Answer 11

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

Question 12

How does the maxillary arch grow?

Answer 12

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

Question 13

How does the arch permineter change in the maxillary arch?

Answer 13

▪ 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 14

Teeth erupt lingual… what moves them forward labially?

Answer 14

the tongue

Question 15

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

Answer 15

• 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 16

What is the arch perimeter?

Answer 16

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 17

What type of curve of spee is this?

Answer 17

normal
- because theres 2-3mm between incisors and molar if you were to lay a ruler flat on there

2-3 mm is normal

Question 18

What type of curve of spee is this?

Answer 18

steep

greater than 2-3 mm

Question 19

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

Answer 19

weak

Question 20

What do you do about third molars?

Answer 20

Whether you have 3rd molars or not, you still have mesial migration of teeth
- blaming it entirely on 3rd molars would be incorrect

Question 21

What is vertical alveolar process growth?

Answer 21

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