Ortho One

Question 1

Extra oral features to look at (6)

Answer 1

1, face shape
2 symmetry
3. Smile line
4. Lip position
5. Face - convex, straight or concave 
6. Mandibular plane - high, average or low

Question 2

Extra oral features to note (3)

Answer 2

1. Contra lateral eruption - within 6 months
2. Tooth size
3. Midline - floss is helpful

Question 3

What is mandibular remodeling?

Answer 3

The distance between the mandibular first molar and the ramus that increases dramatically over time

Question 4

What is more concerning, the pattern of eruption or time variations?

Answer 4

The pattern or sequence of eruption

Question 5

What are the ages of primary teeth?

Answer 5

6 months to 6 years

Question 6

What are the ages of mixed dentition?

Answer 6

6 years to 12 years

Question 7

What teeth erupt during early mixed dentition?

Answer 7

6’s and incisors erupt

Question 8

When is the late mixed dentition?

Answer 8

10-12 years

Question 9

What teeth erupt during late mixed dentition?

Answer 9

Canines, premolars and second molars

Question 10

Crowded primary teeth meant what for permanent teeth?

Answer 10

100% chance of crowded permanent adult teeth

Question 11

What does aligned baby teeth mean for permanent teeth?

Answer 11

70% chance of crowding in permanent teeth

Question 12

3-6mm of spacing in the deciduous teeth means what for permanent teeth?

Answer 12

20% chance of crowding in the permanent teeth

Question 13

The transition from a flush terminal plane to a class one molar relationship is due to what?

Answer 13

A result of differential mandubular growth and/or leeway space

Question 14

What dentition has a flush terminal plane?

Answer 14

The mixed dentition

Question 15

When does the early mixed dentition occur?

Answer 15

6-8 years old

Question 16

What is incisor liability?

Answer 16

The difference between the space needed for the permanent incisors and the space available

Question 17

Size difference between the maxillary deciduous and permanent?

Answer 17

8.2mm

Question 18

What is the space difference between the mandibular deciduous and permanent teeth?

Answer 18

5.6mm

Question 19

Where does the space come from for aligning mildly crowded lower incisors? (3)

Answer 19

1. Slight increase in arch width across canines
2. Slight labial repositioning of the central and lateral incisors (wider arch)
3. Distal shift of the permanent lower canines when the 74/84 exfoliate

Question 20

How does the ugly ducking state present? (5)

Answer 20

1. Flared laterals
2. Midline diastema
3. Lower incisor crowding
4. Upper lateral may tilt distally due to the canines pressing on the distal aspect of their roots
5. Space if the primary canines are lost

Question 21

Age 6

Answer 21

Almost symmultanious eruption of 31/41, 36/46 and 16/26

Question 22

Age 7 (3)

Answer 22

1. Eruption of 11/21 and 32/42
2. Root formation of 12/22
3. 3,4 and 5’s in state of crown completion or just starting root formation

Question 23

Age 8

Answer 23

Eruption of 12/22

- no other teeth erupting for 1-2years

Question 24

Age 9/10 (4)

Answer 24

1. No erupting teeth
2. Middle mixed dentition
3. Check for buccal canine bulges 13/23
4. Resorption of deciduous canines and molars

Question 25

Age 11 (2)

Answer 25

1. Eruption of 33/43, 34/44 and 14/24

2. The late mixed dentition - 2nd transitional period

Question 26

Age 12

Answer 26

Eruption of 13/23, 5’s and 7’s

Question 27

Age 13/14

Answer 27

Permanent dentition stage

Question 28

Age 15 (2)

Answer 28

1. Crown formation of 8’s often complete

2. All permanent roots complete accept the 8’s

Question 29

What is leeway space

Answer 29

The difference in width between the primary and permanent teeth
Max = 1.5mm
Man = 5mm

Question 30

Three things palatable impacted canines are associated with are?

Answer 30

1. Females
2. Peg/small laterals
3. Missing lateral teeth

Question 31

What teeth help to create space when they erupt?

Answer 31

13/23