Anatomy and Development

Question 1

what are the differences between primary and permanent teeth?

Answer 1

primary teeth are whiter
pulp to crown ratio bigger in primary teeth
primary teeth are more bulbous
primary roots are more divergent
contact point in primary teeth is bigger

Question 2

when do primary teeth start to erupt?

Answer 2

6 months

Question 3

what primary teeth erupt first?

Answer 3

lower central incisors

Question 4

when is the primary dentition complete?

Answer 4

2 1/2 years

Question 5

when does the mixed dentition begin?

Answer 5

6 years

Question 6

what are the first permanent teeth to erupt?

Answer 6

lower central incisors

Question 7

what teeth do you get from 6-8 years?

Answer 7

incisors and 1st molars

Question 8

what teeth do you get at age 10?

Answer 8

lower canines and 1st premolars

Question 9

what teeth do you get at age 11?

Answer 9

upper canines and 2nd premolars

Question 10

what teeth do you get at age 12?

Answer 10

2ns permanent molars

Question 11

when is the permanent dentition established?

Answer 11

12

Question 12

what is the curve of spee?

Answer 12

curvature of the mandibular occlusal plane

Question 13

where does the curve of splee begin?

Answer 13

tip of lower incisors

Question 14

what does the curve of splee follow?

Answer 14

buccal cusps of posterior teeth

Question 15

where does the curve of splee end?

Answer 15

anterior mandibular ramus

Question 16

when do primary teeth begin to develop?

Answer 16

day 28 in utero

Question 17

what happens to the continuous plate of epithelium on maxilla and mandible at day 37?

Answer 17

thickens

Question 18

in early development what plays an important role in shaping dental arches?

Answer 18

tongue

Question 19

what are features of primary dentition?

Answer 19

spaced anteriors
primate spaces
shallow overjet and overbite
class I molar relationship

Question 20

in the primary dentition, what molar is the widest?

Answer 20

mandibular

Question 21

why is there spacing of the primary dentition?

Answer 21

mesio-distal width of permanent incisors is 7.6mm greater in the max arch and 6mm greater in the man arch.

Question 22

why is there leeway space?

Answer 22

mesio-distal width of C D E is greater than the 3 4 5

Question 23

whats the effect of early loss of primary teeth?

Answer 23

Formation of fibrous tissue over the erupting tooth – delayed eruption.
However,
If the developing permanent tooth has 1/3 to 2/3 of the root formation completed there will be accelerated eruption.

Question 24

describe a class I incisor relationship

Answer 24

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

Question 25

describe a class II div 2 incisor relationship

Answer 25

• Lower central incisor edges sit posteriorly relative to the upper central incisor central plateaus.
• The upper central incisors are either proclined, or of an average inclination.
• Often an increased overjet.

Question 26

describe a class II div 2 incisor relationship

Answer 26

• Lower central incisor edges sit posteriorly relative to the upper central incisor central plateaus.
• Upper central incisors are retroclined.
• Minimal overjet

Question 27

describe a class III incisor relationship

Answer 27

• Lower central incisor edges sit anteriorly relative to the upper central incisor central plateaus.
• Overjet is reduced or reversed.