Orthopedics 9% 6Q

Question 1

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

Answer 1

Center of Resistance

Question 2

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

Answer 2

⅓

Question 3

The center of resistance for molars is approximately at:

Answer 3

the level of the furcation

Question 4

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

Answer 4

center of rotation

Question 5

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

Answer 5

CW moment

Question 6

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

Answer 6

CCW moment

Question 7

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

Answer 7

800g

400g

Question 8

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

Answer 8

shorter

longer

Question 9

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?

Answer 9

tendency to create cross bite

more distalization

Question 10

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

Answer 10

lingual

buccal

Question 11

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

Answer 11

A point remains stationary

Question 12

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

Answer 12

above

mesial

Question 13

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

Answer 13

below

distal

Question 14

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

Answer 14

CR of the molar

Question 15

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

Answer 15

length

position

Question 16

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

Answer 16

True

Question 17

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

Answer 17

shorter

Question 18

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

Answer 18

shorter

Question 19

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

Answer 19

gingivally

Question 20

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

Answer 20

gingivally

Question 21

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

Answer 21

down

Question 22

typical effects if cervical pull HG include: (2)

Answer 22

tipping the palatal plane

mandibular CW rotation

Question 23

what is the effect of reverse pull HG on SNA?

Answer 23

increase

Question 24

at what age should reverse pull HG be used?

Answer 24

8-10

Question 25

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

Answer 25

500-1000g 1-2lbs (250-500g per side)

Question 26

what is this functional appliance called:

Answer 26

Bionator

Question 27

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 \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Answer 27

AP Mand. posterior eruption

Question 28

distal positioning of mandible can cause impingement on the ___________ nerve

Answer 28

auricular nerve

Question 29

what is this functional appliance

Answer 29

MARA

Question 30

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

Answer 30

deepen anterior

Question 31

Relapse of OJ and molar relationship seen following Herbst Tx is from: ( anterior / posterior ) movement of (maxillary / mandibular ) molars and incisors

Answer 31

anterior maxillary

Question 32

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

Answer 32

True

Question 33

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

Answer 33

makes them procline

Question 34

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

Answer 34

makes them upright

Question 35

what is this appliance called?

Answer 35

twin block

Question 36

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

Answer 36

40% 60%

Question 37

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

Answer 37

CW do NOT

Question 38

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

Answer 38

100

Question 39

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

Answer 39

45-55%

Question 40

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

Answer 40

35-50%

Question 41

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

Answer 41

5-10%

Question 42

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

Answer 42

anterior inferior

Question 43

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

Answer 43

4-6

Question 44

in RPE therapy, the limit to expansion is :

Answer 44

the zygomatic arch

Question 45

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

Answer 45

bonded

Question 46

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

Answer 46

FALSE

Question 47

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

Answer 47

400