Serial Extraction

Question 1

what are the indications for serial extraction

Answer 1

• posterior and anterior crossbites
• ankylosed teeth
• excessive protrusions and diastemas
• severe anterior and lateral open bites
• ectopic molars
• pseudo class III patients
• cleft palate patients
• severe arch length discrepancies

Question 2

what is another name for serial extraction

Answer 2

early orthodontic intervention

Question 3

what are the changes in arch dimension in the maxilla

Answer 3

• maxillary arch length remains the same
• maxillary intercanine distance increases 4.8mm

Question 4

what are the changes in arch dimension in the mandible

Answer 4

• mandibular arch length decreases 1.7mm
• mandibular intercanine distance increases 3.2mm

Question 5

how do you estimate the needed arch length to level the curve of spee

Answer 5

measure the maximum depth of the curve on both sides, get the average measurement and add 0.5mm

Question 6

if the mixed dentition analysis predicts that there is not a crowding problem what do you do?

Answer 6

continue with periodic patient observation

Question 7

if the mixed dentition analysis predicts light crowding (1-4mm) what should you do

Answer 7

maintain arch length with any appliance and examine the patient periodically, probably there will be a need for future ortho treatment

Question 8

if the mixed dentition analysis predicts crowding of more than 4mm what should you do

Answer 8

the patient will develop crowding in the permanent dentition which will require orthodontic treatment after a thorough evaluation

Question 9

if the mixed dentition analysis predicts crowding in excess of 6mm what should you do

Answer 9

in the mandibular arch the patient will benefit from serial extraction therapy

Question 10

what is serial extraction

Answer 10

the orderly removal of deciduous and permanent teeth in a determined sequence

Question 11

what are the prerequisites for serial extraction

Answer 11

• skeletal class I
• dental class I
• bimax dental protrusion
• dental crowding in excess of 6mm
• light or anterior open bite tendency
• no congenitally missing second bicuspids

Question 12

what are the benefits of serial extraction

Answer 12

• naturally induced movement and alignment of severely crowded anterior teeth
• health improvement of the adjacent tissues
• psychological and cooperation improvement due to the incisor alignment
• decrease the orthodontist work load and stress
• less iatrogenic damage

Question 13

what are the main disadvantages of serial extraction

Answer 13

• increase of the overbite
• lingual inclination of incisors
• scaring tissue on the extraction spaces
• diastemas

Question 14

what does conventional serial extraction do

Answer 14

• premature extraction of deciduous canines provides the space for the incisors to assume normal position over supporting bone
• extraction of the first deciduous molars permits the desirable early eruption of the first premolars
• final extraction of first premolars makes it possible for the canines to erupt in a favorable direction

Question 15

what are the prerequisites for alternative serial extraction

Answer 15

• borderline malocclusion
• deciduous cuspids are present
• moderate loss of arch length
• no irregularity on lower incisors
• no gingival recession
• second deciduous molars in place for a long time

Question 16

what are the two types of serial extraction

Answer 16

conventional serial extraction
alternative serial extraction

Question 17

w