Lecture 5:

Question 1

What are the indications for early orthodontic intervention?

Answer 1

1. posterior & anterior crossbites
2. ankylosed teeth
3. excessive protrusions & diastemas
4. severe anterior and lateral open bites
5. ectopic molars
6. pseudo class III patients
7. cleft palate patients
8. severe arch length discrepancies

Question 2

when will a patient benefit from serial extraction therapy in the mandibular arch?

Answer 2

in mixed dentition analysis of the mandibular arch, if crowding is in excess of 6mm

Question 3

What is serial extraction?

Answer 3

The orderly removal of deciduous an permanent test determined in a sequence

Question 4

What are indications for serial extraction:

Answer 4

1. Skeletal class I
2. Dental class I
3. Bimax dental protrusion
4. Dental crowding in excess of 6mm
5. Light or anterior open bite tendency
6. No congenitally missing 2nd bicuspids

Question 5

Disadvantages of serial extraction:

Answer 5

1. increase of overbite
2. lingual inclination of incisors
3. scarring tissue on extraction spaces
4. diastemas

Question 6

What does the premature extraction of deciduous canines provide?

Answer 6

provides the space for the permanent incisors to assume normal position over supporting bone

Question 7

What does extraction of the 1st deciduous molars permit?

Answer 7

permits the desired early eruption of the 1st premolars

Question 8

Why would you extract PERMANENT 1st premolars?

Answer 8

to allow canines to erupt favorably

Question 9

What is needed for ALTERNATIVE serial extraction?

Answer 9

1. borderline malocclusion
2. deciduous cuspids present
3. moderate loss of arch length
4. no irregularity on lower incisors
5. no gingival recession
6. second deciduous molars in place for a long time