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MODULE 3: CLINICAL SCIENCES “B” 65Q > Orthopedics 9% 6Q > Flashcards

Orthopedics 9% 6Q Flashcards

1
Q

Point through which the resultant forces must act on an object to produce bodily movement

A

Center of Resistance

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2
Q

The center of resistance for single root teeth is approximately ___/___ down the root in bone

A

⅓

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3
Q

The center of resistance for molars is approximately at:

A

the level of the furcation

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4
Q

Where the tooth tips/rotates around when the line of force does not pass through CR

A

center of rotation

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5
Q

When the HG line of force is inferior to CR what movement is produced

A

CW moment

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6
Q

When the HG line of force is superior to CR what movement is produced

A

CCW moment

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7
Q

The acceptable force for HG is ____g total of ____g per side

A

800g

400g

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8
Q

In asymmetric HG, the side that is class I will have the ( shorter / longer ) arm and the side that is class II will have the ( shorter / longer ) arm

A

shorter

longer

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9
Q

In asymmetric HG, the side that is class II will have the longer arm which is also away from the cheek to counteract what side effect? and also has the added benefit of what?

A

tendency to create cross bite

more distalization

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10
Q

HG with a unilateral FB can create ( buccal / lingual ) crossbite on Class II side and ( buccal / lingual ) crossbite on Class I side

A

lingual

buccal

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11
Q

what is the effect on A point for patients undergoing high pull HG Tx?

A

A point remains stationary

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12
Q

With high pull HG Tx, CCW maxillary rotation will be produced if the line of force is _______ or _______ to the center of resistance

A

above

mesial

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13
Q

With high pull HG Tx, CW maxillary rotation will be produced if the line of force is _______ or _______ to the center of resistance

A

below

distal

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14
Q

to get distal movement of the molar, the line of force created by high pull HG must go through:

A

CR of the molar

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15
Q

the line of force produced by HG is influenced by ___________ and ___________ of the outer bow

A

length

position

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16
Q

T/F: In HPHG, longer outer bow bent up will have the same force as short outer bow bent down

A

True

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17
Q

You can counteract observed distal tipping due to high pull HG on upper molars with a ___________ and more gingival outer bow

A

shorter

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18
Q

you can counter the effects of a tip-back bend, or a CW moment, by using high pull headgear with ( shorter / longer) outer bow

A

shorter

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19
Q

With cervical pull HG, you can prevent molar crown tipping by moving the outer bow _______________

A

gingivally

20
Q

With cervical pull HG, you can create molar translation by moving the outer bow _______________

A

gingivally

21
Q

With cervical pull HG, by bending the outer bow ______________, you can create distal movement with extrusion of the crowns by moving the roots to a larger arc

A

down

22
Q

typical effects if cervical pull HG include: (2)

A

tipping the palatal plane

mandibular CW rotation

23
Q

what is the effect of reverse pull HG on SNA?

A

increase

24
Q

at what age should reverse pull HG be used?

A

8-10

25
Q

what force should be placed on reverse pull HG? in g and lbs

A

500-1000g

1-2lbs

(250-500g per side)

26
Q

what is this functional appliance called:

A

Bionator

27
Q

A bionator has incisal and occlusal stops control eruption of teeth. Incisal stops can extend to the facial surface to control their position in the ______________ dimension. Occlusal stops can be adjusted to allow _____________________

A

AP

Mand. posterior eruption

28
Q

distal positioning of mandible can cause impingement on the ___________ nerve

A

auricular nerve

29
Q

what is this functional appliance

A

MARA

30
Q

When using a MARA, the bite tends to (open / deepen ) because it allows for extrusion of ( anterior / posterior ) teeth

A

deepen

anterior

31
Q

Relapse of OJ and molar relationship seen following Herbst Tx is from:

( anterior / posterior ) movement of (maxillary / mandibular ) molars and incisors

A

anterior

maxillary

32
Q

T/F: Functional Appliance increase mandibular length more than fixed appliances

A

True

33
Q

What effect do Class II functional appliances have on the lower incisors?

A

makes them procline

34
Q

What effect do Class III functional appliances have on the lower incisors?

A

makes them upright

35
Q

what is this appliance called?

A

twin block

36
Q

According to Prifitt, he effects of the twin block appliance are ___% skeletal and ___% dental. There tends to be a C2E effect.

A

40%

60%

37
Q

Class II elastics cause a ( CW / CCW ) rotation of the occlusal plane; C2E (do / do not ) deepen the bite

A

CW

do NOT

38
Q

During lip bumper therapy, 50% of the expansion is seen in ___ days

A

100

39
Q

___ - ___% of the effect of lip bumper therapy is due to incisor proclination

A

45-55%

40
Q

___ - ___% of the effect of lip bumper therapy is due to molar distalization and tipping

A

35-50%

41
Q

___ - ___% of the effect of lip bumper therapy is due to an increase in inter canine width

A

5-10%

42
Q

in RPE therapy, the effects are greater in the _________ and ________ regions

A

anterior

inferior

43
Q

in RPE therapy, it takes ___ - ___ months to re-establish the suture

A

4-6

44
Q

in RPE therapy, the limit to expansion is :

A

the zygomatic arch

45
Q

in RPE therapy, ( banded / bonded ) helps control the vertical dimension more

A

bonded

46
Q

T/F: a TPA can be used to help maintain the AP position or dimension

A

FALSE

47
Q

in magnet orthodontic therapy, a decrease in distance of magnets by 50% = ___% increase in force

A

400

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

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