Ortho - Removable Appliances

Front 1

What can removable appiances be used for?

Back 1

- growth modification
- (minor) tooth movement
- retention

Front 2

Advantages to using removable appliances?

Back 2

- fabricate in lab so reduces chair time
- can be removed as needed by ptn (social situation, hygeine)
- growth guidance potential

Front 3

Disadvantages to using removable appliances

Back 3

- patient compliances required
- tooth movement primarily limited to tipping teeth

Front 4

Which removable appliances can be used for tooth-borne growth modification?

Back 4

- activator
- bionator
- twinblock

Front 5

Which removable appliances can be used for tissue-borne growth modifications?

Back 5

Frankel

Front 6

How to functional appliances work and their purpose?

Back 6

Produces their effect by altering the position of the mandible. The purpose:
1. modify the pattern of jaw growth
2. alter the direction of tooth eruption
3. correct jaw discrepancies

Front 7

Functional appliances is typically followed by ________________ to detail the position of their teeth and finalize the occlusion.

Back 7

fixed appliances

Front 8

What are some contraindications for functional appliances

Back 8

- lower incisors proclined ( why? because a tx affect of functional appliances is protrusion of lower dentition)
- when you predict compliance will be very poor

Front 9

Features of activator appliance

Back 9

- tooth borne
- opens the bite
- advances the mandible for class II correction

Front 10

Describe a typical activator design

Back 10

- labial bow for control of max teeth
- acrylic covering of lower incisors
- facets to help direct eruption of the posterior teeth
- lingual flange and incisal acrlyic help position mandible
- acrylic covering palate

Front 11

Features of bionator appliance

Back 11

- modification of original activator
- tooth borne passibe appliance
- class II correction

Front 12

Typical bionator design

Back 12

- cross palate wire is suitable for acrylic
- lingual flange regulates the posture of mandible
- acrylic may be adjusted as necessary to control tooth movements

Front 13

Features and design of twin-block appliances

Back 13

- tooth borne passive appliances
- class II correction
- two pieces (max/mand)
- acrlyic ramps posture jaw on forward closure

Front 14

Features of Frankel appliances

Back 14

- tissue borne
- positions mandible for correction of class II or III** (FR-2, FR-3)

Front 15

Describe a typical Frankel design

Back 15

- labial bow for control of anterior teeth
- large buccal shields and lip pads reduce soft tissue pressure on the dentition
- lingual pads or flange help posture mandible to new position
- typically no in-occlusal acrylic

Front 16

How does a removable appliance contact tooth?

Back 16

- contact tooth surface at one point
- can achieve tipping movement

Front 17

T/F: Bodily movements of teeth are possible with removable appliances.

Back 17

False. Tipping movements only.

Front 18

Pure translation vs controlled tipping

Back 18

1. Pure translation: every point moves in the same direction at the same rate (ie crown and root)
2. Controlled tipping: pressure on crown

Front 19

It is difficult to achieve with tooth movements with removable appliances alone?

Back 19

- bodily movements
- torquing
- major rotation
- intrusion
- active extrusion

Front 20

Expansion appliances vs aligners

Back 20

Expansion appliances: transverse and labial
Aligners: repositioning individual teeth

Front 21

Three major components of removable appliances

Back 21

1. Retentive components (clasp etc) to hold appliance in place
2. Frameworks and baseplate (acrylic)
3. Tooth moving elements : springs and screws
Also: wires (labial bow)

Front 22

List 6 types of retentive clasps.
(know this for exam!)

Back 22

1. Ball
2. Adams
3. Occlusal Rest
4. Arrow
5. Circumferential
6. Molar tube

Front 23

When is an acrylic bite plate needed?

Back 23

Deep bite : take post teeth out of occlusion when biting down

Front 24

Types of wire springs

Back 24

1. Overlapping "lap" springs
2. "Z" spring
3. Finger spring
4. Mousetrap spring
5. "Z" spring with helixes

Front 25

What is a cheaper alternative to invisiline?

Back 25

SImpli5

Front 26

Types of retainers?

Back 26

1. Hawley
2. Wrap around "wrap" Hawley

Front 27

Describe Hawley retainer

Back 27

acrylic on palate and labial lobe
- occlusal surfaces not covered

Front 28

Describe wrap around wrap hawley

Back 28

- occlusal surfaces of all teeth covered and palate
- distal of terminal tooth covered (retaining extractions space)