Development of Occlusion

Question 1

Movement of teeth towards the occlusal plane.

Answer 1

Eruption

Question 2

Mean age of the first tooth eruption

Answer 2

7.5 months

Question 3

This invaginates for tooth buds to form.

Answer 3

Dental lamina

Question 4

90% of the primary teeth erupt by what age?

Answer 4

2-3 years old

Question 5

Deciduous eruption earlier in males or females?

Answer 5

Males

Question 6

Erupt at 26-28 months.

Answer 6

Primary second molars

Question 7

Maxillary primate space

Answer 7

Space between the lateral and canine in the primary dentition.

Question 8

Mandibular primate space

Answer 8

Between the canine and first molar.

Question 9

The relation of the mandibular baby second molar to the maxillary baby second molar.

Answer 9

Terminal plane

Question 10

Types of terminal plane.

Answer 10

Flush
Distal step
Mesial step

Question 11

Mandibular 2nd baby molar articulates slightly anterior to the maxillary 2nd primary molar so that the distal of the maxillary and mandibular 2nd primary molars are perfectly aligned.

Permanent first molars initially erupt cusp to cusp.

Answer 11

Flush terminal plane

Question 12

If you’re seeing these types of terminal planes, the dentition will not be perfect, and the client may consider getting dental insurance.

Answer 12

Distal or Mesial steps

Question 13

The distal of the mandibular 2nd baby molar is distal to the maxillary.

Answer 13

Distal step

Question 14

Distal step is what class of occlusion?

Answer 14

II

Question 15

Reference for terminal planes in primary dentition.

Answer 15

Distal aspect of the mandibular primary 2nd molar.

Question 16

Distal aspect of the mandibular primary 2nd molar is anterior to that of the maxillary.

Answer 16

Mesial step.

Question 17

Mesial step terminal plane is what angle classification?

Answer 17

I or III

Question 18

When can you pull baby teeth without delaying eruption of the permanents?

Answer 18

When the root of the permanent tooth is at least 1/2 formed.

Question 19

Maxillary incisor liability.

Answer 19

7.5 mm

Question 20

Mandibular incisor liability.

Answer 20

6 mm

Question 21

No primate spacing leads to crowding ___% of the time.

Answer 21

40

Question 22

The permanent incisors are labially positioned, and this increases arch length how many millimeters?

Answer 22

3

Question 23

Males have an increased canine arch width of ___ mm; Females ___ mm.

Answer 23

6; 4.5

Question 24

T/F: After the laterals erupt, there’s no significant relief in crowding.

Answer 24

True

Question 25

Difference in size between the baby canine and molars, and the permanent canine and premolars

Answer 25

Leeway Space

Question 26

T/F:

Posterior deciduous teeth are larger than permanent teeth.

Answer 26

True

Question 27

1. 8 mm difference between posterior primary and permanent teeth on the Maxillary.
2. 6 mm difference between posterior primary and permanent teeth on the mandibular.

Answer 27

True

Question 28

Flush terminal plane becomes what occlusion?

Answer 28

Class I

Question 29

First permanent molars erupt and move the deciduous molars forward into Class I.

Answer 29

Early Mesial shift.

Occurs bc there’s SPACED deciduous dentition.

Question 30

There’s no deciduous spacing, so the first permanent molars move into Class I after loss of the deciduous 2nd molars.

Answer 30

Late mesial shift.

Question 31

When 2/3 the root is formed, it pierces what?

Answer 31

Alveolar crest.

Question 32

When 3/4 the root is formed, it pierces what?

Answer 32

Gingival margin

Question 33

Males or Females get their permanent teeth first?

Answer 33

Females (bc they’re more mature).

Question 34

T/F:

Maxillary incisors tend to accommodate better than the mandibular.

Answer 34

True

Question 35

Arch width increases:

Intercanine max
Intermolar max

Intercanine mand
Intermolar mand

Answer 35

+5
+4
+3
+2

Question 36

Measurement from incisors to the mesial of the first molar

Answer 36

Arch length.

Question 37

Measurement between deciduous 2nd molars or permanent 2nd premolars.

Answer 37

Arch circumference

Question 38

Early loss of these teeth can be a sign of crowding in the permanent dentition

Answer 38

Baby canines