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MODULE 3: CLINICAL SCIENCES “B” 65Q > Biomechanics, Techniques and Appliances 25% 16Q > Flashcards

Biomechanics, Techniques and Appliances 25% 16Q Flashcards

1
Q

How many grams of force do you need to intrude a maxillary central?

A

25g

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2
Q

How many grams of force do you need to intrude a maxillary central + lateral?

A

50g

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3
Q

How many grams of force do you need to intrude a maxillary central + lateral + canine?

A

100g

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4
Q

How many grams of force do you need to intrude a maxillary canine?

A

50g

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5
Q

How many grams of force do you need to intrude a mandibular central + lateral?

A

40g

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6
Q

How many grams of force do you need to intrude a maxillary central?

A

20g

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7
Q

How many grams of force do you need to intrude a maxillary central + lateral + canine?

A

80g

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8
Q

How many grams of force do you need to intrude a maxillary canine?

A

40g

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9
Q

Moment = ________ x _________

A

moment = foce x distance

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10
Q

tendency for force to produce rotation

A

moment

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11
Q

what is created when a line of force does not go through the of resistance?

A

a moment

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12
Q

A higher moment to force ratio produces more ( crown / root ) movement than ( crown / root ) movement

A

`root

crown

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13
Q

What are placed in areas of largest bending movement so it can create the most gentle force

A

helices

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14
Q

parallel forces in opposite direction

A

couple

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15
Q

___________ movements require a force and a moment

A

bodily

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16
Q

what movement is created when Mc/MF = 0

A

Pure tipping or uncontrolled tipping

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17
Q

what movement is created when 0 < Mc/MF < 1 ?

A

Controlled tipping

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18
Q

what movement is created when Mc/MF = 1 ?

A

bodily movement

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19
Q

what movement is created when Mc/MF > 1 ?

A

torque

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20
Q

the center of rotation of a tooth is approximately

A

⅓ down the root in bone

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21
Q

the center of resistance of a tooth is approximately

A

the midpoint of the root

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22
Q

which appliance can create controlled incisor tipping with CR at the apex

A

lip bumper

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23
Q

force requirement (in g) for intrusion

A

15-25g

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24
Q

force requirement (in g) for tipping, rotation and extrusion?

A

50-75k

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25
Q

force requirement (in g) for translation?

A

100-125g

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26
Q

force requirement (in g) for canine retraction?

A

100-150g

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27
Q

a 0:1 - 5:1 moment to force ratio will produce which type of tooth movement?

A

uncontrolled tipping

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28
Q

a 7:1 moment to force ratio will produce which type of tooth movement?

A

controlled tipping

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29
Q

a 10:1 moment to force ratio will produce which type of tooth movement?

A

translaiton

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30
Q

a 12:1 moment to force ratio will produce which type of tooth movement?

A

tooth movement

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31
Q

Force = (1/Distance)2

This means that if the distance decreases by ½, force increases by ___x

A

4x

32
Q

Force = (1/Distance)2

This means that if the distance increases by ½, force decreases by ___%

A

44%

33
Q

the duration threshold for light force to produce movements is ___ - ___ hours

A

4 - 6hrs

34
Q

In a physiologic response to sustained pressure, movement begins after ___ hours

A

48hrs

35
Q

on average, RPE treatment will move the A point 2.5mm ____________ and 3.5mm ___________

A
  1. 5mm downward
  2. 5mm forward
36
Q

to determine that a crossbite is skeletal, you will see dental compensations. upper molars will have ______ crown torque and lower molars will have _________ crown torque

A

buccal

lingual

37
Q

the limit

A
38
Q

the limit to expansion is the

A

zygomatic arch or pterygoid plates

39
Q

the mandibular limit to expansion is the

A

coronoid process of the mandible

40
Q

After RPE, stabilization is needed for ___ - ___ months to re-establish the suture

A

4 - 6months

41
Q

the maxillary mid-palatal suture is _________ tissue that is mainly __________ with osteogenic surfaces on each side.

A

fibrous

collagen

42
Q

can RPE reduce nocturnal enuresis (involuntary urination)?

A

yes

43
Q

in RPE, the dental:skeletal effects of expansion are ___ : ___

A

1 : 1

44
Q

During bonding we use ___% ________________ acid as etch. This removes ___ - ___ microns of enamel.

A

37% phosphoric acid

3-10 microns

45
Q

Omission of air-dispersion step ( increases / decreases ) shear bond strength in self-etching primer system

A

decreases

46
Q

Porcelain etch for bonding is made of ___% _________

A

10% HCl

47
Q

Bracket adhesive with Fl- releasing etching gel has significantly ( higher / lower) bond strength

A

higher

48
Q

Fl- applied to teeth before bonding ( increases / decreases ) bond strength

A

decreases

49
Q

Fl- prevents dental caries by decreasing enamel _____________

A

solubility

50
Q

1st order wire bends are

A

in / out

rotation and BL thickness

51
Q

2nd order wire bends are:

A

up / down – align marginal ridges

52
Q

3rd order wire bend are:

A

torque

53
Q

When pt has steep premolar cusps: finish with ( increased / decreased ) OB

A

increased

54
Q

reorganization of the PDL occurs in ___ - ___ months

A

3 - 4 months

55
Q

the class II div 2 characteristic that is most prone to relapse is:

A

deep bite

56
Q

Case: rotated incisors, deep bite, large overjet. Most likely to relapse?

A

Rotation

57
Q

which periodontal fibers most important in stability / relapse?

A

supracrestal fibers

58
Q

After orthodontic treatment, these things can happen:

  1. Reduction in root _______
  2. Reduced _______ support
  3. Crowding
  4. Rotation
A
  1. length
  2. alveolar bone
59
Q

In Little’s post-tx relapse study he found that ___/___ of mandibular incisors relapse

A

⅔

60
Q

Burstone stated that the upper occlusal plane should be relatively ______ and not allow more than ___mm of incisal show at rest

A

flat

3mm

61
Q

Soft tissue thicknesses increase more in ( females / males )

A

females

62
Q

The incidence of canine impactions is ___ - ___%

A

1 - 2%

63
Q

With canine impaction cases, the incidence of the impaction being bilateral is ___%

A

8%

64
Q

The 3 options for labially positioned impactions are:

A

closed eruption, apically positioned flap, excisional

65
Q

For labially positioned impacted canines, choose (closed eruption / apically positioned flap ) for a better esthetic outcome

A

closed eruption

66
Q

For labially positioned impacted canines, an apically positioned flap is good when:

A

when the canine is angles mesiodistally

and when there is an inadequate amount of gingiva

67
Q

For labially positioned impacted canines, excisional technique is good when there is ___mm or more of attached gingiva and the tooth is below the _____________

A

3mm

mucogingival junction

68
Q

Palatal impactions are ___x more likely than labial impaction

A

2x

69
Q

If tip is distal to lateral root, removal of C will resolve ___% of cases

A

91%

70
Q

If tip is past midline of lateral root: removal of C resolves ___% of cases

A

64%

71
Q

When a mesiodens causes the impaction of a central incisor, the _____________ technique should be used to bring it into the arch

A

closed eruption

72
Q

T/F: Functional appliances accelerate Mn growth, but treated pts do not have larger mandibles

A

True

73
Q

According to Bancceti’s articles, with the use of a twin block appliance, overall changes are ___% dental and ___% skeletal

A

45%

55%

74
Q

with the use of a twin block appliance, which parts of the mandible show and increase in size?

A

body

ramus length

75
Q

With a twin block appliance, the lower incisors are capped to prevent:

A

proclination and extrusion

76
Q

The twin block appliance allows you the ability to increase VDO by:

A

removing acrylic from lower part of appliance so mandibular teeth will erupt

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

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