12. Extractions Flashcards Preview

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Flashcards in 12. Extractions Deck (24)
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1
Q

Know eruption patterns for canines and bicuspids on mandibular and maxillary arch

A

Maxilla
-1st PM – 2nd PM – canine

Mandible
-Canine– 1st PM– 2nd PM

2
Q

Serial extraction purpose

A
  • Disrupt usual eruption sequence (want the 1st bicuspids on lower arch to come in before canines)
  • Extract in early mixed dentition to avoid crowding in permanent dentition
  • Facilitates fixed appliance therapy later
3
Q

Contraindications for serial extraction

A
  • Class II or III
  • Skeletal discrepancy
  • Deep overbite (need maxillary Hawley and baseplate)
  • Imbalance perioral musculature (strain, hypo/hypertonicity)
  • Habits
4
Q

Want at least _ mm of crowding for serial extractions

A

10 mm

5
Q

Sequence of serial extractions

A
  • Extract all deciduous canines
  • Extract deciduous 1st molars
  • Extract 1st bicuspids
6
Q

Why extract the deciduous canines

A

-eases anterior crowding

7
Q

Extraction of the deciduous first molars benefits the (maxillary/mandibular) arch

A

mandibular

8
Q

Why extract the 1st bicuspids

A

-permanent canines drift distally into extraction sites

9
Q

Benefits of serial extractions

A
  • Naturally induced alignment severely crowded anterior teeth
  • Improved periodontal health
  • Improved cosmetics/psychological state
  • Facilitates fixed appliance workload
  • Less possible orthogenic damage
10
Q

T/F anchorage units tend to move

A

t

11
Q

Which is more difficult maintaining tooth position or moving teeth

A

maintaining

12
Q

Difference between intra-oral and extra-oral anchorage

A
intra= anchorage inside the mouth 
Extra= outside mouth
13
Q

Cervical, occipital and parietal are…

A

down, horizontal and high pull

14
Q

Facial includes what extraoral features

A

forehead and chin

15
Q

Intra-oral anchorage types are

A
  • Simple
  • Stationary
  • Reciprocal
16
Q

Describe simple, stationary and reciprocal anchorage

A
  • Simple= tooth may tip
  • Stationary= tooth may only move bodily (translate)
  • Reciprocal= both units move equal amounts in opposite directions
17
Q

Structures for intra-oral anchorage are

A
  • Teeth
  • Basal bone and overlying soft tissue
  • Cortical bone plates
18
Q

Characteristics of teeth that make good anchors are

A
  • Root form
  • Root size and number
  • Root length
19
Q

Root form of

  • bicuspids
  • Mand. incisors
  • Canines
  • Max. centrals
A
  • bicuspids= round
  • Mand. incisors= flat
  • Canines= triangular
  • Max. centrals= triangular
20
Q

Increased root surface = (increased/decreased) stress resistance

A

increased

21
Q

Basal bone and soft tissue that can be used for anchorage includes what structures intraorally

A
  • hard palate (i.e nance)

- Lingual surface of mandible

22
Q

T/F cortical plates facilitate tooth movement

A

f- resists tooth movement. cancellous bone supports tooth movement

23
Q

TADs stands for

A

temporary anchorage device

24
Q

Another word for TADs is

A

orthodontic microimplants