2015 Questions Pt. 4 Flashcards
In a High Pull Headgear, if the bow is bent above the COR of the maxilla, what happens to the molars?
Distal tip of the root
A fingerspring is used, where is the center of rotation on the incisor?
Apical 1/3
Putting buccal crown torque on one tooth, where is the wire compared to the plane of occlusion
Below
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?
Steepen the mandibular occlusal plane
If canine is 10 mm away and force is 100 g, what is the moment?
1000 g/mm
Early extraction of a mandibular primary canine will lead to all of the following except?
Correction of a midline shift
How many canine impactions are labial and how many are palatal?
1/3 labial
2/3 palatal
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?
91% self correct when distal
64% self correct when mesial
If canine erupts in place of a missing lateral incisor space and the c is retained, how much alveolar bone is lost?
< 1%
What do patient’s complain about after canine substitution?
Color
What do you not consider when substituting a canine for a lateral
Buccal occlusion on opposite/unaffected side
Patient has normal width of maxillary incisors and has black triangles. What is the most important consideration?
Mesiodistal inclination
But might be Crown height/width radio
Might also be all of the above
T/F
In early mixed dentition, you need to treat skeletal open bite
Because you can diagnose it easily at this stage
True
True
What percentage of young kids w/ anterior open bite do we have to treat?
20%
What percentage of open bite close on their own?
80%
Which one is not a characteristic of a skeletal anterior open bite?
Short posterior cranial base length
No evidence to suggest that posterior length affects sagittal discrepancy
Case question:
Patient has wide buccal corridors
False
Case question:
Maxillary excess, what can you do, there is only 3 incisors
Flare upper and retrocline lowers
T/F
Most of the early crowding can be solved if you do serial extraction
You get more incisor retroclination by doing so
True
True
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
True
True
T/F
Hispanics have greater incidence of Class III than Caucasians
True
Which of the following is not true about arch form?
Mandibular arch form is based on the maxillary arch form
This is not true, it’s the other way around
What is not an acceptable record to evaluate an orthodontic patient with perio problems?
PSR
When can perio patient start orthodontic treatment?
After getting approval from dentist/periodontist
T/F
Measuring papilla levels to bone is predictable
It should be 5 mm from contact to alveolar crest of bone
True
True
What is the stability of anterior open bites treated surgically and nonsurgically?
82% of open bites treated surgically are stable
75% of open bites treated nonsurgically
When impacting maxilla, where do you put the maxillary arch relative to the face?
Measure incisal display at rest and that will tell you how much impaction can be done
What is the relationship of maxillary incisors to stomion superiorus in a patient with skeletal open bite?
Below
In a surgical case where mandibular advancement is required, what is a presurgical consideration?
Do not level COS
Extraction patterns for surgical patients
Class II U5’s + L4’s
Class III U4’s + L5’s
Extract to decompensate
Extraction patterns for nonsurgical cases:
Class II U4s + L5s
Class III U5s + L4s
If your patient has a droopy lip after BSSO surgery, what nerve was injured?
Facial Nerve - buccal branch to facial
Best type of surgery for class III patient with TMD problems
IVRO
No rigid fixation
Distraction osteogenesis of mandible is not associated with:
TMD
Endodontically treated teeth have how much resorption compared with non-endodontically treated teeth?
About the same
After apexification with CaOH, increased risk of what?
Root fracture
For restorative or implant, what is the size of the lateral?
2/3 width of the central
Max central incisor - Ideal width to height percentage
80%
What maxillary alveolar ridge development for implants in U2 position and the upper B’s are still present, what do you do?
Extract B’s and let 3’s erupt mesial and retain C’s
If 17 yr old guy has a ceph taken 6 months from now and doesn’t show growth, can you place implant immediately?
yes
Maxillary anterior ridge width after extraction experiences what % BL
23%
Posterior: 30%
Tetracycline staining around implants means what?
It is rigid with high bone turnover
