Removable Appliance Flashcards
(14 cards)
removable components of a removable appliance
springs
biteplanes
screws
bows
passive component of removable appliance
retainers
what is a spring
constructed in 0.5mm or 0.7mm stainless steel to move a single tooth or groups of teeth
equation for force and deflection of stainless steel springs
why to apply force of springs to gingival margin
to reduce tipping tendancy
examples of springs
palatal finger spring
buccal canine retractor
z spring
t spring
how much does a quarter turn of screw separate
0.25mm separation
how is retention of appliance achieved
retention achieved by clasps/ cribs
examples of clasps
adam’s or delta cribs
southend and c- clasps - incisors
ball hooks - interdental imbrasure
what do adams clasps do
engage undercuts at the mesial and distal corners of the edges
should engage 1mm of the undercut
adjust with adam pliers
what is anchorage
resistance to unwanted tooth movment
how can we reinforce anchorage with URAs
clasp more teeth
move only one or two teeth at a time
use lighter forces
occlusal capping
add headgear
how often are removable appliances worn a day
24hrs/day
what can aligners do
produce small tooth movements
