Interceptive Ortho 2

Question 1

What arch is more affected by submerging/infra-occluded teeth?

Answer 1

Lower arch

- need to check if it has a perm successor

Question 2

How do we diagnose submerging teeth? (3)

Answer 2

1. Visual
2. Percussion
3. Radiographs

Question 3

How do we manage submerging teeth?

Answer 3

PERMANENT SUCCESSOR
- then just observe 1yr

NO SUCCESSOR
- extract

Question 4

Why are distally tipped B’s a good sign for canines (in ugly ducking stage)

Answer 4

Canine is pressing against the distal aspect of the upper lateral

Question 5

What radiographs would you use to determine the position of an ectopic canine?

Answer 5

OPT

Anterior maxillary occlusal

Question 6

When can we extract a C and get 90% success?

Answer 6

If it doesn’t overlap the adjacent lateral by more than 1/2

90% chance C’s will self-align

Question 7

Extraction of C’s if patient over 13??

Answer 7

Dentition will be stable

Need Ortho tx

Question 8

When can we extract a C and only get 60% success?

Answer 8

If upper canine is more than half way over the adjacent incisor

Still good sucess

Question 9

What is a reverse OJ?

Answer 9

Lowers biting in front of uppers

Question 10

Key things to note in ROJ assessment (2)

Answer 10

1. Can the patient achieve an edge to edge bite
2. Incisal relationship

If incisal relationship/incisal inclination not too severe then we can possibly tx them with a URA

Question 11

What are the guideline incisal angulations for tipping of teeth

Answer 11

Less than 120 uppers

More than 80 lowers

Question 12

You take a lateral ceph, the patient has 77 degrees to the mandibular plane:

Can you tip these teeth?

Answer 12

No scope to retrocline any further as less than 80

Question 13

What functional appliances are used for class 3s? (3)

Answer 13

1. Growth modification
   Functional appliances:
   > Functional Regulator (FR)
   > Frankel (FR) III
2. Camouflage URA
   > URA with z spring or screw used
3. Maxillary Protraction
   > Reverse pull headgear
   NEW METHOD:
   > Strong class III elastic traction worn FT
   > Applied to bone screws or plates fixed to maxilla and mandible

Question 14

Whats the difference between FRII and FRIII?

Answer 14

FRIII is an FRII upside down

Question 15

What components make up an FR? (4)

Answer 15

1. Buccal shields
   - To hold cheeks and the buccinator away from the teeth and allow the teeth to naturally expand
2. ## Pelots
3. Tight lower labial bow
   - To tip teeth back
4. Spring to procline ULS

Question 16

Tx for class II

Answer 16

1. Growth Modification:
   > Functional appliances
   > Headgear to restrict max forward growth

Question 17

What type of class do functional appliances work better for?

Answer 17

Class II

Question 18

Protocol for reverse OJ

Answer 18

Refer

If not too severe can be tx’d with a URA