Removable Appliances Flashcards
What does ARAB stand for?
Active
Retention
Anchorage
Baseplate
What are common uses for removable appliances?
- space maintainers
- retainers
- expansion
- biteplanes
- functional
- support distal movements
- digit dissuader
- extrusion of teeth
What the are advantages of removable appliances?
- cheap
- simple and easy to adjust
- oral hygiene easier than with fixed appliances
- can move teeth in blocks
What are the disadvantages of removable appliances?
- patient compliance needed
- move only a few teeth at a time
- tipping movements only
- retention in lower arch is difficult
- rotations difficult to treat
- affects speech
What are the limitations of removable appliances?
- tipping movements only - bodily movements not possible
- multiple movements in 3D not possible
- precision movements not easily achieved
- inter arch elastics not easily achieved
- less tolerated in lower arch
What’s the use of occlusal stops?
Prevents over eruption of teeth
What are methods of assessing wear of a removable appliance?
- patient wearing appliance on arrival
- patient can insert and remove
- patient can speak normally and no exaggerated saliva
- erythema of palatal gingiva and post dam region
- indentation in gingival sulcus from arrowhead
- signs of tooth marks on appliance
- appliance becoming loose
- signs of wear on the appliance
What tooth movements can be achieved with a removable appliance?
- simple tipping movements
- slow differential eruption of teeth using bite planes
- distal movement of buccal segments with headgear
- distal movement of upper buccal segment mesial movement lower buccal segment with functional
- stops tooth movement - anchorage
- blocks of teeth with expansion
What are active components of a removable appliance?
Bite planes
Springs
Midline screw
Labial bow
What are retentive components of a removable appliance?
Claps
Labial bow
How much expansion does 1 turn of a midline screw create?
0.25 mm
What does an anterior bite plane do?
Props the bite and allows differential tooth eruption
Extrusion of posterior teeth and intrusion of anterior teeth
Flattens the curve of spee
What must be told to the lab when making an anterior bite plane?
The overjet plus 2mm
So that the patient cannot escape the bite when in retruded contact position
When reducing an overjet with a removable appliance what would be the expected rate of tooth movement in mm per month?
1mm
In what sequence should you design a removable orthodontic appliance?
Active, retentive, anchorage, baseplate
