Extractions As Part Of Treatment

Question 0

Which type of incisor orthodontia problem needs soace creation to be corrected?

Answer 0

Overjet reduction

Question 1

When would we extract teeth in ortho?

Answer 1

• Crowing
• Space to correct incisor relationship
• Provide anchorage to move teeth

Question 2

If you were reducing an overjet by 5mm how much space would need to be created?

Answer 2

10mm

1mm:2mm space

Question 3

Why would you extract upper teeth rather than prolonging lower incisors to correct overbites?

Answer 3

Upper incisor retraction is more stable than proclaiming lower labial
Risk of perforating buccal plate in lower labialise segment which means perio problems

Question 4

What happens when you being to move teeth into spaces that have been created by extraction?

Answer 4

1. Movement of desired teeth

2. Movement of anchor teeth

Question 5

If you do not have enough anchorage from the teeth and intro oral sites what could you do?

Answer 5

Head gear

Question 6

What are the factors which influence the choice of teeth to be extracted?

Answer 6

1. Dental health of the tooth
2. Future Stability
3. Amount of space and anchorage needed
4. Labial vs molar

Question 7

What factors about future stability must be avoid when extracting teeth?

Answer 7

Do not want to later AP direction of incisors

Do not want to expand the arch

Question 8

T/F

Extracting teeth closer to the problem area crates less anchorage

Answer 8

F

Question 9

What is the problem with xla labial segment teeth?

Answer 9

Aesthetically important

Question 10

What is the problem with xla molars?

Answer 10

Generally too far forward from where the problem lies

Question 11

What are the advantage the advantages of xla premolars?

Answer 11

1. Space near the front which is where most problems are
2. Contact or residual space which is dentally healthy if no active treatment is carried out
3. Permits good occlusal fit

Question 12

Which arch should be planned first?

Answer 12

Lower arch

Question 13

How much crowding would be mildly crowded?

Answer 13

1-4mm

Question 14

How much crowding would be moderate crowding?

Answer 14

5-9mm

Question 15

How much crowding would be 9+ mm?

Answer 15

Severe

Question 16

Which teeth would you extract in mildly crowded case?

Answer 16

None or 5’s

Question 17

Which teeth would you xla in moderate crowded case?

Answer 17

5/4

Question 18

Which teeth would you xla in severely crowded case ?

Answer 18

4

Question 19

What group of factors do you need to consider before extracting?

Answer 19

Tie Break Factors

Question 20

What are the tiebreak factors?

Answer 20

1. Canine Angulation
2. Lip prominence
3. Initial incisor inclination

Question 21

T/F the upper arch needs less space than the lower when planning extractions and why?

Answer 21

F
It needs as much space or more space because the upper anterior teeth are larger and occasionally have an overjet which needs solving

Question 22

In the upper arch retroclined 3’s need more space to align?

Answer 22

T

Question 23

Incisors that are positioned in an upright manner need more or less anchorage?

Answer 23

More

Question 24

If you extract upper premolars and not anylower teeth how will this affect the lost relationship?

Answer 24

Molars finish in class 2

Question 25

What is the canine rule?

Answer 25

Need enough space to get the cosines into class 1 relationship when the lower labial segment is well aligned