Serial Extractions Flashcards

1
Q

Early orthodontic intervention
Indications:
(8)

A
  1. Posterior & anterior crossbites.
  2. Ankylosed teeth.
  3. Excessive protrusions and 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.
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2
Q

Evaluated the available space by changes in
(2)

Serial dental casts of 182 North American white
individuals between 3 and 16-18 years of age

A

intercanine width and arch length

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3
Q

Changes in Arch Dimension
Maxilla AL
Primary
Mixed
Permanent

A

28.5
29.9
28.8

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4
Q

Changes in Arch Dimension
Maxilla IC
Primary
Mixed
Permanent

A

28.8
32.0
33.6

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5
Q

Maxillary arch …
Maxillary intercanine distance …

A

length remains the same
increases 4.8mm

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6
Q

Changes in Arch Dimension
Mandible AL
Primary
Mixed
Permanent

A

25.5
25.3
23.5

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7
Q

Changes in Arch Dimension
Mandible IC
Primary
Mixed
Permanent

A

22.3
25.5
25.5

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8
Q

Mandibular arch length …
Mandibular intercanine distance …

A

decreases 1.7mm.
increases 3.2mm

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9
Q

Leveling the curve of Spee: its effects on
mandibular arch length
To estimate the needed arch length to level the
curve of Spee, measure the

A

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

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10
Q

Interpretation of the Mixed Dentition Analysis.
If the mixed dentition analysis predicts that
there is not a crowding problem,

A

continue with
periodic patient observation.

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11
Q

If the mixed dentition analysis predicts light
crowding (1 - 4 mm.),

A

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

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12
Q

If the mixed dentition analysis predicts crowding
of more than 4mm.,

A

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

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13
Q

If the mixed dentition analysis predicts crowding
in excess of 6mm. In the mandibular arch, the
patient will benefit form

A

serial extraction therapy

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14
Q

Serial extraction is the orderly removal of
deciduous and permanent teeth in a determined
sequence.
(6)

A
  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 second bicuspids
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15
Q

Main benefits of serial extraction.
(5)

A
  1. Naturally induced movement and
    alignment of severely crowded anterior
    teeth.
  2. Health improvement of the adjacent
    tissues.
  3. Psychological and cooperation
    improvement, due to the incisor
    alignment.
  4. Decrease on the orthodontist work load
    and stress.
  5. Less iatrogenic damage.
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16
Q

Main disadvantages of serial extraction.
(4)

A
  1. Increase of the overbite.
  2. Lingual inclination of incisors.
  3. Scaring tissue on the extraction spaces.
  4. Diastemas.
17
Q

Prerequisites in serial extraction
Conventional serial extraction:
(3)

A
  1. Premature extraction of deciduous canines
    provides the space for the incisors to assume
    normal position over supporting bone.
  2. Extraction of the first deciduous molars permits
    the desirable early eruption of the first premolars.
  3. Final extraction of first premolars makes it
    possible for the canines to erupt in a favorable
    direction
18
Q

Alternative serial extraction:
(6)

A
  1. Borderline malocclusion (extraction?).
  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.
19
Q
A