Fixed Appliances Flashcards
what are fixed appliances
appliances which are fixed to the teeth and cannot be removed by the patient
what do fixed appliances consist of
brackets, bands, archwires, modules and auxiliaries
what do fixed appliances allow for
precision movement
complex movement
control of root
less compliance dependent
what are the downsides of fixed appliances
requires excellent OH
risk of iatrogenic damage
poor intrinsic anchorage
what are the uses of fixed appliances
correction of mild to moderate skeletal discrepancies
alignment of teeth
correction of rotations
centreline correction
overbite and overjet reduction
closure of spaces/creating spaces
vertical movements of teeth
what do we aim for with orthodontic treatment
andrews six keys
what are andrews six keys
tight approximal contacts
class 1 incisors
class 1 molars
flat occlusal plane
long axis of teeth slight mesial inclination
crowns of canines back to the molars have lingual inclination
what material is used for brackets
stainless steel
what are bands made of
stainless steel
what is used to bond brackets to teeth
composite via acid etch
what is used to bond bands to teeth
GI
what materials are used for archwires
stainless steel
nickel titanium
when would a nickel titanium wire be used
in early stages when you need lots of flexibility due to tooth position
what are the properties of NiTi archwire
flexible
light continuous force
shape memory
higher friction
name some force generating components
elastic power chain
NiTi coils
intra-oral elastics
active ligature
how do teeth move with force generating components
due to the energy stored in the elastic/spring
what is anchorage
resistance to unwanted tooth movement
what is anchorage based on
Newtons 3rd law
how do you increase anchorage
compound anchorage
absolute anchorage
cortical anchorage
intermaxillary anchorage
what is compound anchorage
linking groups of teeth together
what is reciprocal anchorage
when one tooth is similar to another (2 centrals) so there is equal tooth movement
what is absolute anchorage
non-osseointegrating mini screws in the bone to apply elastics round
what is cortical anchorage
transpalatal arch
lingual arch
nance palatal arch
what is intermaxillary anchorage
applying elastics from one jaw to the other
what features have high relapse rate
diastema
rotations
palatally ectopic canines
proclination of lower incisors
anterior open bite
instanding upper lateral incisors
when would you use a fixed orthodontic retainer
space closure
diastema
proclination of lower labial segment
periodontal cases
ectopic canines
instanding upper 2s
what are the 3 risks of fixed appliances
decalcification
root resorption
relapse
what is the GDP role with fixed appliances/retention
regular exams
OHI and diet advice
communicate with orthodontist if concerns
make appliance safe in case of orthodontic emergency
