skeletal changes (dr. sun) Flashcards
maxillary hypoplasia results in which occlusion class?
class III
maxillary prognathism
class II
transverse deficiency
posterior crossbite
to restrain the growth of the mandible ______ is used.
high pull, cervical pull and combi headgear
headgear uses ______ to _______g of orthopedic force distributed over large bone areas.
500-1000g
a force duration of ______hrs is used to achieve orthopedic movement
12-16 hours
the force frequency used with headgear is __________ not __________.
intermittent, consistent
to achieve maxillary protraction, ________ and __________headgear are used.
face mask and reverse pull headgear
intraoral compnents of reverse pull headgear are anchored to ____________ or sometimes____________.
maxillary molars, premolars
face mask and reverse pull headgear maxillary protraction is usually done before age ______ and often last _______.
10-11, 6-8mo
how much skeletal movement can we expect with maxillary protraction?
not more than 3mm
to correct a transverse deficiency, ____________ is used.
palatal expansion
what pts. have a max. transverse deficiency?
- class III malocclusion
- class II with vertical (long face) problems
- an isolated problem
which suture is targeted with palatal expansion?
midpalatal
rapid palatal expansion is mostly used with ______ children and achieves _____mm/ day and the course takes _______weeks.
adolescent, 1, 2-3
when RPE is used in preschool and pre-adolescent children ______ or ______ appliances are used instead of the jackscrew type.
W-arch, Quad helix
for late adolescents and young adults, _________expansion is used and results in ______mm/ ______ of movement.
slow, 1mm/ week
expansion is followed by ____mo of retention for bone consolidation.
3-6mos
RPE results in ____% skeletal movement and _____% dental movement.
50 50
in adults, palatal expansion mostly results in ______ movement. large movement require ________.
dental, surgical
where does the mandible mainly grow?
condyles, posterior and lateral surfaces
mand hypoplasia/ retronathism
class II
mand prognathism
class III
transverse constriction
brodie bite
when accelerating mandibular growth, _______ partly accounts for the inconsistent skeletal effect?
loading pattern, condyle minimally affected
what are 2 unwanted dental effects of fxnl appliances?
lower incisor proclination
upper incisor retroclination
__________ is rarely used to restrain mandibular growth because it __________ anterior face height.
chin-cup headgear, increases
what is currently the most commonly used tx for mandibular prognathism?
mandibular surgical setback after cessation of mandibular growth .
widening the mandible with expansion appliances can expand the _________ but NOT the _________.
dento-alveolus , basal bone
____________ is done to expand the basal bone
distraction osteogenesis
a surgically and mechanically induced bone regeneration process which has been used commonly to lengthen limb and craniofacial bones.
distraction osteogenesis (DO)
four major sequential phases of DO
- Latency: the interval between osteotomy operation and the start of distraction
- Distraction: the period that distractor activation takes place
- Consolidation: post-distraction period (appliance still in place) to allow for new bone formation
- Remodeling: the period that the regenerated bone continues to remodel (after appliance removal)
3 types of symphyseal distractors
bone borne, tooth borne, hybrid
rank distractors by stability
hybrid> tooth borne> bone borne
rank distractors by reliability of transferring expansion force to the bone
tooth borne> hybride
