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SX #2 > dental deformaties > Flashcards

dental deformaties Flashcards

(67 cards)

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1
Q

causes of skeletal malocclusion (4 main)

A

trauma
pathology
congenital
developmental

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2
Q

ex of skeletal malocclusion due to trauma

A

condylar fracture

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3
Q

ex of skeletal malocclusion due to pathology

A

radiation when young (anodontica, hypoplasia of mandible)

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4
Q

ex of skeletal malocclusion due to congenital defects

A

clefts (class III due to mx deficiency)

syndromes (treacher collins causes mn deficiency)

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5
Q

ex of skeletal malocclusion due to developmental problems

A

condylar hyperplasia

most malocclusions

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6
Q

most malocclusions are due to …

A

developmental problems

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7
Q

Tec 99 radioactive =

A

condylar hyperplasia?

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8
Q

acromegaly causes…

A

class III

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9
Q

goldenhar’s syndrome =

A

hemifacial microsomia

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10
Q

tx of skeletal malocclusions (broad)

A

growth redirection
ortho camo
orthgnathics

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11
Q

in order for growth redirection to work..

A

the patient needs to still be growing

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12
Q

why do you need to decide if you want to do ortho camo or orthognathics before beginning treatment

A

the ortho movements are opposite for the two treatment options

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13
Q

problems with growth redirection

A

pt must still be growing

TMJ considerations

limited correction possible

compliance and burnout (especially cleft pts)

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14
Q

advantages of orthognathic surgery

A

increased stability
decreased treatment time
improved occlusion
improved esthetics

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15
Q

TADS can do what

A

move the envelope of discrepancy for orthodontic movement

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16
Q

envelope of discrepancy shows a visual of..

A

how far you can move teeth with ortho, growth redirection and surgery

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17
Q

phases of treatment for orthognathics and how long for each

A

pre-sx ortho (12-18 mos)

surgery

post-sx ortho (6 mos)

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18
Q

general dentists role in orthognathic sx

A

will they need veneers, crown lengthening etc

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19
Q

general facial form is defined by what ceph measurement

A

N-A-Pg

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20
Q

Pg (on ceph)

A

tip of chin

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21
Q

t/f: you can identify specific skeletal problems using N-A-Pg

A

false

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22
Q

convex profile indicates:

A

protrusive maxilla
retrusive mandible
combo of both

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23
Q

a convex profile is skeletal/dental class

A

II

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24
Q

concave profile indicates:

A

retrusive maxilla
protrusive mandible
combo of both

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25
concave profile is dental/skeletal class
class III
26
vertical maxillary hyperplasia causes class ___ relationship
II causes mandible to rotate DOWN...chin goes down too...looks class II
27
vertical maxillary deficiency causes ___ relationsihp
class III
28
an open bite is indicative of..
class III
29
% occurrence for class II, how many need surgery?
10% occurrence | 2% need surgery
30
which is harder to correct surgically: class II or III
class II
31
% occurrence for class III, how many need surgery?
2.5% occurrence | 40% need surgery
32
which is more likely to need surgical correction: class II or III
class III (good thing is its easier to correct)
33
t/f: patients often look worse during pre-sx ortho phase
true
34
can you get accurate occlusion from a CT scan
no, fillings cause scatter
35
when is a female's mandible done growing
13-14 yo
36
"my incisors stick out" why?
retrognathic mn
37
why do you place a k-wire on the nasion during surgery
to determine vertical position
38
what dimension does the stent determine during sx
AP and transverse
39
with a BSSO forward advancement, do you get a gap in the space you advanced?
no, you slide the segments (you dont need a bone graft)
40
anterior horizontal osteotomy =
genioplasty
41
can a BSSO go forward or backward
yes
42
when would a BSSO be unstable
correcting anterior open bite (counterclockwise rotation)
43
major risk of BSSO
damage to IAN avoid if you correctly split around the nerve, but this is harder to do the older the patient
44
t/f: direct damage to IAN is rare during BSSO
true
45
what is most important to do before removing teeth or doing BSSO
CONSENT--make sure they know about paresthesia
46
at least ____% of BSSO pts will have some IAN, damage, but ___% are satisfied with the procedure
50% will have numbness but 90% are happy
47
t/f: damage to IAN during BSSO procedure will induce lingual paresthesia
FALSE, lip and chin only
48
t/f: any damage to IAN during BSSO will result in profound/complete numbess
nope just parasthesia. disathesia is UNCOMMON
49
which is more stable: maxillary advancement or setback
advancement
50
t/f: with a le fort sx you can move the maxilla in all planes
true
51
a le fort surgery is a good, stable option for correction of anterior open bite
true | BSSO to correct anterior open bite is NOT stable
52
t/f: internal rigid fixation is possible for both BSSO and le fort procedures
true
53
what condition would cause a skeletal deficiency due to oligodontia and what treatment might be appropriate?
ectodermal dysplasia, le fort 1, pack sinus with hip graft
54
why are cleft patients different/more difficult?
scar tissue makes it harder to move, they have BIG A-P problems (large moves) VP incompetence, vascular compromise, palatal/nasiolabial fistulas
55
is the envelope of discrepancy larger or smaller for cleft patients
smaller (scar tissue)
56
t/f: MMA (OSA surgery) has been shown to remove need for CPAP in 100% of patients in one study
true
57
who would be a good candidate for OSA surgery (max/mn advancement)
non-obese patients unable to tolerate CPAP no evidence of redundant pharyngeal soft tissue
58
what is the morbidity for orthognathic surgery
very low (unless obese OSA pt)
59
do patients stay overnight for orthognathics
usually overnight, you can do it in outpatient in OMFS clinic though
60
do you usually need to do IMF for orthgnathics
no
61
incisions are intra/extra oral for orthognathics
intraoral
62
satisfaction rate for orthognathics
98%
63
how long do you keep rubber bands on after orthognathics
3 days
64
how long are pts on liquid diet after orthognathics
3 days (when rubber bands are on)
65
how long should an orthognathic pt stick to soft diet
6 weeks
66
how to fix open bite without moving mandible?
take interference out of mx posterior
67
what muscles will pull and reopen an open bite after correction surgically
masseter, temporalis

SX #2 (6 decks)

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