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 & lateral open bites
5. ectopic molars
6. psuedo class III patients
7. cleft palate patients
8. severe arch length discrepencies

Question 2

When will a patient benefit from serial extraction therapy?

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 and permanent teeth determined in a sequence

Question 4

What are the 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 decidous 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 first deciduous molars permit?

Answer 7

Permits the desirable early eruption of the first premolars

Question 8

Why would you extract permanent first premolars?

Answer 8

To allow canines to erupt favorably

Question 9

What is needed ALTERNATIVE SERIAL EXTRACTION?

Answer 9

1. borderline malocclusion
2. decidious 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