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MODULE 3: CLINICAL SCIENCES “B” 65Q > Ortho/Surgical Treatment & Implants 18% 12Q > Flashcards

Ortho/Surgical Treatment & Implants 18% 12Q Flashcards

1
Q

do you have to level the COS before a mandibular advancement?

A

no, could help brachyfacial patients to level after b/c it will inc LAFH

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2
Q

what is the most stable surgical movement?

A

maxillary impaction

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3
Q

what surgical movements are highly stable?

A
  1. maxilla up
  2. mandible forward
  3. chin in any direction
  4. maxilla forward (just stable)
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4
Q

what surgical movements are stable when modifications are made?

A
  1. maxillary asymmetry
  2. maxilla up + mandible forward
  3. maxilla forward + mandible back
  4. mandibular asymmetry
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5
Q

what surgical movements are problematic?

A
  1. mandible back only
  2. maxilla down
  3. maxillary expansion
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6
Q

hard tissue:soft tissue changes for genioplasty is ___ : ___

A

1:1

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7
Q

hard tissue:soft tissue changes for maxillary advancement is ___ : ___

A

3:1

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8
Q

what are the 2 most common complications with a BSSO

A

condylar sagging

post-surgical trismus

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9
Q

which surgical movement is most likely to produce popping of crepitus?

A

mandibular advancement

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10
Q

what complication can lead to a change in occlusion with a mandibular setback?

A

condyles located posteriorly creating an anterior open bite

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11
Q

for patients with mandibular prognathism who undergo mandibular setback, the position of the hyoid bone includes (small / large / no ) AP changes in relation to the pharyngeal wall

A

no significant

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12
Q

for patients with mandibular prognathism who undergo mandibular setback, the position of the hyoid bone includes

  • downward movement
  • backward movement
  1. both
  2. downward only
  3. backward only
A

downward movement

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13
Q

for patients with mandibular prognathism who undergo mandibular setback, physiologic adaptations ( did / did not ) occur to ensure maintenance the airway

A

did

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14
Q

Early intervention surgery is done only if functional condyle is needed in the case of partial ____________ + ____________________ of one condyle

A

ankylosis

osteochondroma

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15
Q

what is one ST side effect after Mx impaction

A

alar base widens

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16
Q

distraction osteogenesis is used in patients with ____________ deficiency, like syndromic patients who have CLP or Crouzons, and in some instances in patients with mandibular __________

A

maxillary

crowding

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17
Q

with distraction osteogenesis, the latency period (from time of surgery to beginning traction) is:

A

5-7 days

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18
Q

one advantage to distraction osteogenesis is that it can increase bone in ___ planes of space with concomitant ___________ adaptation

A

all 3 planes

soft tissue

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19
Q

Cascade of events after surgical fracture

  1. ______________ forms due to vascular disruption
  2. Reorganization of clot as a result of invading ____________
  3. Initiation of healing and soft ____________ formation
  4. 5th – 7th day: inflammatory granulation tissue of the initial soft callus converted into an organized ______________ zone similar to RPE
  5. _____________ can be initiated
A
  1. Hematoma
  2. capillaries
  3. callus
  4. fibrous CT
  5. Traction
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20
Q

the surgical option of a true mandibular deficiency is:

A

distraction osteogenesis at the mandibular symphysis

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21
Q

with distraction osteogenesis, slow incremental traction has allowed for up to ___mm mandibular lengthening with NO associated pain

A

20mm

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22
Q

is there an increase in TMD with distraction osteogenesis patients?

A

no

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23
Q

distraction osteogenesis is the treatment of choice for what circumstances?

A

limb length discrepancies, skeletal deformities, severe bony defects

24
Q

what is one main contraindication for rigid fixation?

A

condylar displacement

25
Q

when considering soft tissue changes, the upper lip ratio is ___ : ___

A

3 : 1

26
Q

when considering soft tissue changes, the chin ratio is ___ : ___

A

1 : 1

27
Q

post-op paresthesia after L8 extraction ( is / is not ) common

A

is

28
Q

the surgeon can minimize relapse by _____________ repositioning of the segments during surgery

A

passive

29
Q

LeFort I osteotomy affects the ( middle / lower ) ⅓ of the face

A

lower

30
Q

Maxillary advancement has what effect on upper incisor show

A

increases U1 display

31
Q

the main blood supply to the maxilla is the:

A

ascending pharyngeal artery

32
Q

which surgical movement can make a patient look older?

A

maxillary impaction

33
Q

what is an indication for a LeFort II?

A

retursive maxilla and nose

34
Q

the proximal segment of the mandible ( does / does not ) include the condyle

A

does

35
Q

the distal segment of the mandible includes:

A

teeth

36
Q

___________ fixation promotes stability

A

rigid

37
Q

Name as many factors as you can that can cause or lead to an increased predilection for condylar resorption

A
  1. Rheumatoid arthritis
  2. Trauma
  3. Neoplasia
  4. Ortho Tx
  5. Orthognathic Sx
  6. Pre-Existing TMJ
  7. Age 15-35 female
  8. High mandibular plane angle
38
Q

___% of non-impacted asymptomatic L8s eruption normally

A

33% or ⅓

39
Q

with autotransplantation, _______________ is the most likely cause of tooth loss

A

external root resorption

40
Q

just as in RPE, the limiting factor to overall expansion in SARPE Tx is the:

A

zygomatic ridge

41
Q

the best mandibular surgical technique for patients with TMD is:

A

IVRO - intraoral vertical ramus osteotomy

42
Q

When considering growth which continues after surgery:

maxillary ___________ dimension stops but _________ dimension continues, and mandibular growth is ___________

A

maxillary AP dimension stops but vertical dimension continues

normal

43
Q

Head of implant fixture should be ___mm apical to desired gingival margin

A

4mm

44
Q

maxillary implant healing time is ___ - ___ months while mandibular implant healing time is ___ - ___ months

A

Max 6-8

Mand 4-6

45
Q

the implant study on experimental animals showed a ___% success rate

A

94%

46
Q

Implant may be placed if there is no change in ___________ facial development taken from serial cephs 12 months apart

A

vertical

47
Q

In general implants may be placed in females age ___, but is is better to wait until age ___. in males, you can place at age ___ but it is better to wait until age ___.

A

F 14, 17

M 19, 21

48
Q

Bone on the (tension / compression ) side of the implant is thicker

A

compression (opposite to ortho)

49
Q

When replacing an over-retained primary tooth, the implant placement timing is:

A

2 months after extraction

50
Q

Type of movement most likely to cause disosseointegration of an implant

A

Tipping

51
Q

how much force is necessary to disosseointegrate an implant?

A

none (N/A)

52
Q

Worst type of bone to use for bone graft for later implant

A

Hydroxyapatite

53
Q

what type of bone is present at the interface of an implant?

A

composite bone

54
Q

the minimum osseointegration for TADs is ___%

A

5%

55
Q

TADs that are osseointegrated show __________ movement

A

no movement

56
Q

if cortical plate is difficult to penetrate, a ________________ may be needed to prevent high insertion torque and potential for screw failure (proffit)

A

Pilot hole

MODULE 3: CLINICAL SCIENCES “B” 65Q (7 decks)

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