Extractions in ortho Flashcards
why does space creation need to happen?
relieve crowding
correct overjet/overbite
correct molar relationship
compensate for skeletal discrepancy
how is space creation achieved?
growth/functional appliance distal movement expansion interdental enamel reduction extractions
how is expansion caused?
quadhelix - pushes teeth and widens arch
Rapid maxillary expiser - screw turned 2-4 x a day
what anatomy means that expansion can be caused?
under 15 yrs - palatal suture has not yet fused - can move bones
how is distal movement achieved?
headgear
non compliance distaliser
implants
why are A’s/B’s commonly XLA?
ectopic permanent successor
trauma
why are C’s commonly XLA?
trauma
incisor crowding
correct centre line
ectopic perm canine
how are ectopic canines identified?
not palpable by 10yrs
x ray - parallax
why are D’s commonly XLA?
infraocclusion
hypodontia
ectopic permanent
why are E’s commonly XLA?
ectopic 5
infraocclusion
hypodontia
impacted 6
why are max. centrals commonly XLA?
Trauma
pathology
dilaceration
why are max.laterals commonly XLA?
contralateral is absent
why are mandibular incisors commonly XLA?
lingual exclusion
fanned incisors
why are canines commonly XLA?
severley displaced
bad crowding
why are 1st premolars commonly XLA?
to fix crowding
overjet reduction
xla and fixed appliance is most common tx for class 1
