skeletal changes (dr. sun)

Question 1

maxillary hypoplasia results in which occlusion class?

Answer 1

class III

Question 2

maxillary prognathism

Answer 2

class II

Question 3

transverse deficiency

Answer 3

posterior crossbite

Question 4

to restrain the growth of the mandible ______ is used.

Answer 4

high pull, cervical pull and combi headgear

Question 5

headgear uses ______ to _______g of orthopedic force distributed over large bone areas.

Answer 5

500-1000g

Question 6

a force duration of ______hrs is used to achieve orthopedic movement

Answer 6

12-16 hours

Question 7

the force frequency used with headgear is __________ not __________.

Answer 7

intermittent, consistent

Question 8

to achieve maxillary protraction, ________ and __________headgear are used.

Answer 8

face mask and reverse pull headgear

Question 9

intraoral compnents of reverse pull headgear are anchored to ____________ or sometimes____________.

Answer 9

maxillary molars, premolars

Question 10

face mask and reverse pull headgear maxillary protraction is usually done before age ______ and often last _______.

Answer 10

10-11, 6-8mo

Question 11

how much skeletal movement can we expect with maxillary protraction?

Answer 11

not more than 3mm

Question 12

to correct a transverse deficiency, ____________ is used.

Answer 12

palatal expansion

Question 13

what pts. have a max. transverse deficiency?

Answer 13

1. class III malocclusion
2. class II with vertical (long face) problems
3. an isolated problem

Question 14

which suture is targeted with palatal expansion?

Answer 14

midpalatal

Question 15

rapid palatal expansion is mostly used with ______ children and achieves _____mm/ day and the course takes _______weeks.

Answer 15

adolescent, 1, 2-3

Question 16

when RPE is used in preschool and pre-adolescent children ______ or ______ appliances are used instead of the jackscrew type.

Answer 16

W-arch, Quad helix

Question 17

for late adolescents and young adults, _________expansion is used and results in ______mm/ ______ of movement.

Answer 17

slow, 1mm/ week

Question 18

expansion is followed by ____mo of retention for bone consolidation.

Answer 18

3-6mos

Question 19

RPE results in ____% skeletal movement and _____% dental movement.

Answer 19

50 50

Question 20

in adults, palatal expansion mostly results in ______ movement. large movement require ________.

Answer 20

dental, surgical

Question 21

where does the mandible mainly grow?

Answer 21

condyles, posterior and lateral surfaces

Question 22

mand hypoplasia/ retronathism

Answer 22

class II

Question 23

mand prognathism

Answer 23

class III

Question 24

transverse constriction

Answer 24

brodie bite

Question 25

when accelerating mandibular growth, _______ partly accounts for the inconsistent skeletal effect?

Answer 25

loading pattern, condyle minimally affected

Question 26

what are 2 unwanted dental effects of fxnl appliances?

Answer 26

lower incisor proclination

upper incisor retroclination

Question 27

__________ is rarely used to restrain mandibular growth because it __________ anterior face height.

Answer 27

chin-cup headgear, increases

Question 28

what is currently the most commonly used tx for mandibular prognathism?

Answer 28

mandibular surgical setback after cessation of mandibular growth .

Question 29

widening the mandible with expansion appliances can expand the _________ but NOT the _________.

Answer 29

dento-alveolus , basal bone

Question 30

____________ is done to expand the basal bone

Answer 30

distraction osteogenesis

Question 31

a surgically and mechanically induced bone regeneration process which has been used commonly to lengthen limb and craniofacial bones.

Answer 31

distraction osteogenesis (DO)

Question 32

four major sequential phases of DO

Answer 32

1. Latency: the interval between osteotomy operation and the start of distraction
2. Distraction: the period that distractor activation takes place
3. Consolidation: post-distraction period (appliance still in place) to allow for new bone formation
4. Remodeling: the period that the regenerated bone continues to remodel (after appliance removal)

Question 33

3 types of symphyseal distractors

Answer 33

bone borne, tooth borne, hybrid

Question 34

rank distractors by stability

Answer 34

hybrid> tooth borne> bone borne

Question 35

rank distractors by reliability of transferring expansion force to the bone

Answer 35

tooth borne> hybride