Overview Anatomy and Development

Question 1

When do primary teeth start to erupt?

Answer 1

6 months

Question 2

Which primary teeth erupt first?

Answer 2

Lower central incisors

Question 3

When is the primary dentition complete?

Answer 3

Around 2.5 years

Question 4

When does the mixed dentition stage start?

Answer 4

6 years

Question 5

Which teeth erupt first in the mixed dentition stage?

Answer 5

Lower central incisors

Question 6

When is the permanent dentition established?

Answer 6

Around 12 years

Question 7

What are the 2 main phases of eruption with permanent teeth?

Answer 7

6-8 years; 10-12 years

Question 8

What teeth erupt between 6 and 8 years?

Answer 8

Incisors and 1st permanent molars

Question 9

What teeth erupt at 10 years?

Answer 9

Lower canines and 1st premolars

Question 10

What teeth erupt at 11 years?

Answer 10

Upper canines and 2nd premolars

Question 11

What teeth erupt at 12 years?

Answer 11

2nd permanent molars

Question 12

What is the curvature of spee?

Answer 12

The curvature of the mandibular occlusal plane: starts at the tip of lower incisors and ends at the anterior mandibular ramus

Question 13

Spacing of primary teeth?

Answer 13

To maintain a class 1 molar relationship (combined width C,D,E is greater than 3,4,5 because less teeth means need to maintain the space somehow!)

Question 14

Describe the Class 1 Incisor Relationship

Answer 14

The lower central incisor edges occlude with the upper central incisor central plateaus.

Question 15

What is the commonality between Class 2 Division 1 and 2 Incisor Relationship

Answer 15

The lower central incisor edges sit posteriorly relative to the upper central incisor central plateau.

Question 16

What is the difference between Class 2 Division 1 and 2 Incisor Relationship?

Answer 16

In class 1 - the upper central incisors are either proclined or of an average inclination; increased overjet

In class 2 - The upper central incisors are retroclined and there is often a minimal overjet

Question 17

Describe a Class 3 Incisor Relationship

Answer 17

The lower central incisor edges sit anteriorly relative to the upper central incisor plateaus; reduced or reversed overjet

Question 18

Describe a Class 1 Molar Relationship

Answer 18

The mesiobuccal cusp of the maxillary 1st molar occludes in line with the buccal groove of the mandibular 1st molar

Question 19

Describe a Class 2 Molar Relationship

Answer 19

The mesiobuccal cusp of the maxillary 1st molar occludes anterior to the buccal groove of the mandibular first molar

Question 20

Describe a Class 3 Molar Relationship

Answer 20

The mesiobuccal cusp of the maxillary 1st molar sits posterior to the buccal groove of the mandibular 1st molar

Question 21

When do neural crest cells migrate?

Answer 21

4th week human embryonic development