2015 Questions Pt. 4

Question 1

In a High Pull Headgear, if the bow is bent above the COR of the maxilla, what happens to the molars?

Answer 1

Distal tip of the root

Question 2

A fingerspring is used, where is the center of rotation on the incisor?

Answer 2

Apical 1/3

Question 3

Putting buccal crown torque on one tooth, where is the wire compared to the plane of occlusion

Answer 3

Below

Question 4

When you’re using class II elastics that goes through the center of resistance of the maxilla and distal to the center of rotation of the mandible, what does it do to the planes?

Answer 4

Steepen the mandibular occlusal plane

Question 5

If canine is 10 mm away and force is 100 g, what is the moment?

Answer 5

1000 g/mm

Question 6

Early extraction of a mandibular primary canine will lead to all of the following except?

Answer 6

Correction of a midline shift

Question 7

How many canine impactions are labial and how many are palatal?

Answer 7

1/3 labial

2/3 palatal

Question 8

If the canine is impacted and the canine crown is distal to the lateral, what percentage will self correct?
What if it’s mesial to the lateral?

Answer 8

91% self correct when distal

64% self correct when mesial

Question 9

If canine erupts in place of a missing lateral incisor space and the c is retained, how much alveolar bone is lost?

Answer 9

< 1%

Question 10

What do patient’s complain about after canine substitution?

Answer 10

Color

Question 11

What do you not consider when substituting a canine for a lateral

Answer 11

Buccal occlusion on opposite/unaffected side

Question 12

Patient has normal width of maxillary incisors and has black triangles. What is the most important consideration?

Answer 12

Mesiodistal inclination
But might be Crown height/width radio
Might also be all of the above

Question 13

T/F
In early mixed dentition, you need to treat skeletal open bite
Because you can diagnose it easily at this stage

Answer 13

True

True

Question 14

What percentage of young kids w/ anterior open bite do we have to treat?

Answer 14

20%

Question 15

What percentage of open bite close on their own?

Answer 15

80%

Question 16

Which one is not a characteristic of a skeletal anterior open bite?

Answer 16

Short posterior cranial base length

No evidence to suggest that posterior length affects sagittal discrepancy

Question 17

Case question:

Patient has wide buccal corridors

Answer 17

False

Question 18

Case question:

Maxillary excess, what can you do, there is only 3 incisors

Answer 18

Flare upper and retrocline lowers

Question 19

T/F
Most of the early crowding can be solved if you do serial extraction
You get more incisor retroclination by doing so

Answer 19

True

True

Question 20

T/F
Preferred way to treat a class II patient is to decrease the OP to SN angle.
This is because increasing SN-MP leads to instability

Answer 20

True

True

Question 21

T/F

Hispanics have greater incidence of Class III than Caucasians

Answer 21

True

Question 22

Which of the following is not true about arch form?

Answer 22

Mandibular arch form is based on the maxillary arch form

This is not true, it’s the other way around

Question 23

What is not an acceptable record to evaluate an orthodontic patient with perio problems?

Answer 23

PSR

Question 24

When can perio patient start orthodontic treatment?

Answer 24

After getting approval from dentist/periodontist

Question 25

T/F
Measuring papilla levels to bone is predictable
It should be 5 mm from contact to alveolar crest of bone

Answer 25

True

True

Question 26

What is the stability of anterior open bites treated surgically and nonsurgically?

Answer 26

82% of open bites treated surgically are stable

75% of open bites treated nonsurgically

Question 27

When impacting maxilla, where do you put the maxillary arch relative to the face?

Answer 27

Measure incisal display at rest and that will tell you how much impaction can be done

Question 28

What is the relationship of maxillary incisors to stomion superiorus in a patient with skeletal open bite?

Answer 28

Below

Question 29

In a surgical case where mandibular advancement is required, what is a presurgical consideration?

Answer 29

Do not level COS

Question 30

Extraction patterns for surgical patients

Answer 30

Class II U5’s + L4’s
Class III U4’s + L5’s
Extract to decompensate

Question 31

Extraction patterns for nonsurgical cases:

Answer 31

Class II U4s + L5s

Class III U5s + L4s

Question 32

If your patient has a droopy lip after BSSO surgery, what nerve was injured?

Answer 32

Facial Nerve - buccal branch to facial

Question 33

Best type of surgery for class III patient with TMD problems

Answer 33

IVRO

No rigid fixation

Question 34

Distraction osteogenesis of mandible is not associated with:

Answer 34

TMD

Question 35

Endodontically treated teeth have how much resorption compared with non-endodontically treated teeth?

Answer 35

About the same

Question 36

After apexification with CaOH, increased risk of what?

Answer 36

Root fracture

Question 37

For restorative or implant, what is the size of the lateral?

Answer 37

2/3 width of the central

Question 38

Max central incisor - Ideal width to height percentage

Answer 38

80%

Question 39

What maxillary alveolar ridge development for implants in U2 position and the upper B’s are still present, what do you do?

Answer 39

Extract B’s and let 3’s erupt mesial and retain C’s

Question 40

If 17 yr old guy has a ceph taken 6 months from now and doesn’t show growth, can you place implant immediately?

Answer 40

yes

Question 41

Maxillary anterior ridge width after extraction experiences what % BL

Answer 41

23%

Posterior: 30%

Question 42

Tetracycline staining around implants means what?

Answer 42

It is rigid with high bone turnover