Malocclusion

Question 1

What are the different types of malocclusion?

Answer 1

simple= single tooth
compound= multiple teeth
complex= skeletal discrepancy
compound and complex= dental and skeletal problem

Question 2

What type of malocclusion would be with an over-protruded mandible?

Answer 2

complex (skeletal discrepancy)

Question 3

T/F: Most causes of malocclusions are unknown.

Answer 3

True. 60% are unknown but likely genetic

Question 4

Of the identifiable causes of malocclusions, what are some common ones?

Answer 4

-embryonic, growth disturbances, muscle dysfunction, trauma, etc.
(only 5% of etiologies)

Question 5

How common are each malocclusion classes?

Answer 5

class I: 60%
class II: 30%
class III: 5%

Question 6

What is the difference between a cross bite and functional shift?

Answer 6

cross bites have abnormal buccal-lingual relation between opposing teeth in centric relation

functional shifts undergo a midline compensatory or habitual shift when the teeth occlude in cross bite

Question 7

Why is a cotton ball used to diagnose a functional shift in cross bites?

Answer 7

If placing the cotton ball at midline, we can see if it lined up or shifted to the side before and after biting

Question 8

How do you differentiate between uni- and bilateral cross bite?

Answer 8

unilateral will only have one side effected
bilateral will have both sides effected

Question 9

What is the cause of posterior cross bite?

Answer 9

thumb sucking or pacifier for too long

Question 10

Does an anterior cross bite and open bite have negative or positive measurements?

Answer 10

negative

Question 11

Does an overbite have negative or positive measurements?

Answer 11

positive

Question 12

What are treatment options for malocclusion?

Answer 12

equilibration, appliance therapy, extractions, or combination of tx

Question 13

How do slow vs rapid skeletal expanders work?

Answer 13

slow expansion starts working when first placed but then stops working over time
rapid expansion is activated the more you keep working oral cavity

Question 14

How does the secondary palate fuze?

Answer 14

front to back

Question 15

How does primary palate fuze?

Answer 15

back to front

Question 16

If you put a palatal expander after the palate is fused around age 5, what will you move?

Answer 16

only teeth
because palate has already fused

Question 17

What do you do if you need to expand the palate, but the bones have already fused?

Answer 17

surgery is required. Can only move the palate when the bones have an open suture

Question 18

What is pseudo class III?

Answer 18

presence of an anterior crossbite due to a forward functional displacement of the mandible

maxillary incisors give degree of retroclination, and the mandibular incisors are proclined

Question 19

In which class are upper incisors proclined?

Answer 19

class II division I

Question 20

In which class are upper central incisors lingual inclined and can be overlapped by upper lateral incisors?

Answer 20

class II division II

Question 21

In which class is there excessive overjet and deep overbite?

Answer 21

class II division I

Question 22

In which class is there deep overbite?

Answer 22

class II division II

Question 23

In which class has a shorter upper lip?

Answer 23

class II division I

Question 24

In which class is there an underdeveloped mandible?

Answer 24

class II division I