Fixed and Removable Appliances

Question 1

Is the crozart appliance fixed or removable?

Answer 1

Removable

Question 2

Is a space maintainer fixed or removable?

Answer 2

Fixed

Question 3

Is the rapid palatal/maxillary expander appliance fixed or removable?

Answer 3

Fixed

Question 4

Is the activator appliance fixed or removable?

Answer 4

Removable

Question 5

Is the schwarz plate appliance fixed or removable?

Answer 5

Removable

Question 6

Is the bionator appliance fixed or removable?

Answer 6

Removable

Question 7

Is the habit breaking appliance fixed or removable?

Answer 7

Fixed

Question 8

Is the twinblock appliance fixed or removable?

Answer 8

Removable

Question 9

Is the lingual arch appliance fixed or removable?

Answer 9

Fixed

Question 10

Is the Herbst appliance fixed or removable?

Answer 10

Fixed

Question 11

Is the Hawley retainer appliance fixed or removable?

Answer 11

Removable

Question 12

Is the lingual wire fixed or removable?

Answer 12

Fixed

Question 13

Are bands and brackets fixed or removable?

Answer 13

Fixed

Question 14

What does the crozart appliance do?

Answer 14

• helps straighten teeth by guiding the jawbone as it develops
• widens dental arches/fosters bone growth
• young children

Question 15

What does the activator appliance do?

Answer 15

• corrects retrognathic profile (for class II occlusion)

- redirects pressures of muscles of mastication of the teeth and jaws producing a favourable effect.

Question 16

What does the schwarz plate appliance do?

Answer 16

• expands upper or lower arches
• midline screw which is expanded slowly to avoid client discomfort
• if on lower, small amounts of tooth movement may be achieved

Question 17

Is the adams clasp an actual appliance itself?

Answer 17

No. It is a component used to retain a custom medical device in the mouth.

Question 18

What is the purpose of the adams clasp?

Answer 18

Retains a custom medical device in the mouth.

Question 19

How does the adams clasp function?

Answer 19

By engaging the mesiobuccal and distobuccal undercuts of a tooth.

Question 20

What does the bionator appliance do?

Answer 20

• corrects discrepancy in anterior/posterior in both arches
• correct overbites
• promote jaw growth
• mandibular teeth bite forward to advance the mandible and stimulate growth
• lower incisors are capped with acrylic to prevent them from tipping facially

Question 21

What does the twin block appliance do?

Answer 21

• corrects underdeveloped jaws
• holds jaws slightly apart and the lower jaw in a forward position
• young = most efficient
• some only use 1
• maxillary plate has headgear tube and usually includes an expansion screw
• individual plates with ramps that guide the mandible forward when the patient closes down

Question 22

What is the Hawley retainer appliance for?

Answer 22

• protects results of your orthodontic care

- can be used for very minimal treatment

Question 23

What is characteristic of the Hawley retainer?

Answer 23

Anterior bow and clasps on molars.

Question 24

What does the space maintainer do/what does it look like?

Answer 24

-stainless steel band with soldered metal loop that contacts tooth that may drift

Question 25

What does the rapid palatal/maxillary expander do/what does it look like?

Answer 25

• narrow maxillary arch expansion device
• has a wire framework that clips over the exposed head of the bone screws
• expansion device with initial activation of the jackscrew progress with expansion

Question 26

What does the habit breaking appliance do/what does it look like?

Answer 26

• 2 molar bands soldered to wire

- designed to impair the placement of thumb/finger or tongue tip

Question 27

What does the lingual arch appliance do/what does it look like?

Answer 27

• two molar bands soldered to heavy gauge wire to maintain position of anteriors and first molars
• client may wear for years until permanent teeth have erupted

Question 28

What does the Herbst appliance do/where is it attached?

Answer 28

• prevents lower jaw from moving backward (opening and closing still occurs easily)
• the device is attached to the back molars on the upper and lower jaws with the bands that are cemented into place

Question 29

What does the lingual wire do?

Answer 29

The lingual wire holds teeth in place to prevent relapse after active orthodontic treatment.

Question 30

Explain bands…

Answer 30

Molar bands are sized and then cemented to adhere to teeth.

Question 31

Explain brackets…

Answer 31

Brackets are bonded in position with a composite resin.

Question 32

What are the advantages of removable appliances?

Answer 32

1. fabricated in the lab and adjusted extra-orally rather than directly in the mouth.
2. they can be removed on socially sensitive occasions of wires on the facial part of the teeth would be visible, or can be made almost invisible if fabricated from clear plastic materials. They are more acceptable for adults.

Question 33

What are the disadvantages of removable appliances?

Answer 33

1. the response to treatment is heavily dependent on client compliance since the appliance can be effective only when the client chooses to wear it.
2. difficult to obtain the two-point contacts on teeth necessary to produce complex tooth movements which means that the appliance itself may limit the possibilities for treatment.