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Orthodontics > Exam 3 - Dentofacial Orthopedics Pt 2 > Flashcards

Exam 3 - Dentofacial Orthopedics Pt 2 Flashcards

1
Q

What did Bretiner 1940 do?

A
  • experiment in monkeys which changed positions of the mandible anteriorly and posteriorly via intermaxillary elastics
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2
Q

Bretiner (1940) used elastics fixed to teeth which produced which type of malocclusions?

A

Class 2 and Class 3
- change in POSITION of mandible

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3
Q

Histologically, what did Bretiner (1940) demonstrate?

A

changes in ramus, gonial angle, glenoid fossa

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4
Q

What did Jansen and Bluher (1965) do?

A
  • studied POSTERIOR AND SUPERIOR traction of mandible in monkeys
  • placed a hook in basal bone of mandibular symphysis and used extraoral traction
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5
Q

What type of modification is the milwaukee brace?

A

vertical

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6
Q

What type of modification is Jansen and Bluher?

A

anteroposterior

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7
Q

What type of modifiction is Breitner 1940?

A

anteroposterior

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8
Q

What was the net effect of the Milwaukee brace?

A
  • reduction of lower facial height and chin projection anteriorly
  • creates a prognathasim
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9
Q

What is the Milwaukee brace used for?

A
  • treatment of young patients with polio or scoliosis
  • mandible rotated upward and forward around condyles
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10
Q

After years of observation and experimentation, what 6 things did they discover when the milwaukee brace is used?

A
  1. reduction of gonial angle
  2. shortened ramus
  3. lower face height decreased
  4. intraoral space decreased
  5. molars intrude
  6. maxillary and mandibular incisors tip labially
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11
Q

On Macaca mulatta, what 3 effects were found using a milwaukee brace?

A
  1. ramus height decreased
  2. molars intruded
  3. labial tipping maxillary and mandibular incisors
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12
Q

In the rheus monkey (macaca mulatta), what did they discover?

A

changes in mandibular length

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13
Q

What type of effect is Robin’s Monobloc?

A

postural change effects

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14
Q

loose acrylic plate that imposed a given position on the mandible

A

Robin’s monobloc

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15
Q

What does a robin’s monobloc do?

A

monobloc is a passive appliance creating a reflex mechanism which triggers the muscles of mastication into closing

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16
Q

During closure, what does the robin’s monobloc do?

A

guides mandible to a protusive position

17
Q

What does the Andresen activator promote?

A

remodeling changes of the mandible due to change in posture

18
Q

What does the Andresen activator do?

A
  • facets in posterior acrylic allow mesial eruption of mandibular posterior teeth and
  • distal eruption of maxillary posterior teeth
  • correcting class II malocclusion
19
Q

What does the Andresen activator result in?

A

modification in vertical and anterior-posterior proportions of face

20
Q

What 4 things does a bionator (1980s) appliance do?

A
  1. cut down (simpler) activator
  2. reduced bulk of the appliance
  3. ability to reposition the mandible
  4. modify dental eruption
21
Q

Are Herbst appliances bonded or fixed?

A

Both!

22
Q

What is a Twin block?

A

uses forces of occlusion as the functional mechanism to correct the malocclusion

23
Q

a “tissue borne” appliance

A

frankel appliance

24
Q

Where is most of the Frankel appliance located?

A

vestibule

25
Q

What does a Frankel appliance generate?

A

arch expansion due to buccal shields

26
Q

What does a frankel appliance reduce?

A

dental crowding through alveolar bone development

27
Q

What does a Frankel appliance promote?

A

mandibular differential growth/headgear effect reducing maxillary growth

28
Q

How often are class III activators used?

A

rarely

29
Q

What does a class III activator do?

A

skeletal movement
- downward and backward rotation of the mandible
- reduces the protrusion of the chin

30
Q

What does the ideal patient for chin cup therapy look like?

A

mild skeletal problem with the ability to bring the incisors end-to-end or nearly so

31
Q

What is a face mask?

A
  • splinting of maxillary teeth using an acrylic occlusal splint
  • may include palatal expander
32
Q

What force and duration is required for a face mask?

A

force = 12 to 16 oz
duration = minimal 14 to 16 hrs/day (including bedtime)

33
Q

What are the two indications for a face mask?

A
  1. children aged 6-8
  2. exerts force on maxilla via elastics that attach to a maxillary splint producing both tooth movement and displacement of the maxilla
34
Q

What is the contraindication of a face mask?

A

in children above 9 years of age the treatment produces more dental movement and very little skeletal change

Orthodontics (7 decks)

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