Malocclusion Flashcards
What are the different types of malocclusion?
simple= single tooth
compound= multiple teeth
complex= skeletal discrepancy
compound and complex= dental and skeletal problem
What type of malocclusion would be with an over-protruded mandible?
complex (skeletal discrepancy)
T/F: Most causes of malocclusions are unknown.
True. 60% are unknown but likely genetic
Of the identifiable causes of malocclusions, what are some common ones?
-embryonic, growth disturbances, muscle dysfunction, trauma, etc.
(only 5% of etiologies)
How common are each malocclusion classes?
class I: 60%
class II: 30%
class III: 5%
What is the difference between a cross bite and functional shift?
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
Why is a cotton ball used to diagnose a functional shift in cross bites?
If placing the cotton ball at midline, we can see if it lined up or shifted to the side before and after biting
How do you differentiate between uni- and bilateral cross bite?
unilateral will only have one side effected
bilateral will have both sides effected
What is the cause of posterior cross bite?
thumb sucking or pacifier for too long
Does an anterior cross bite and open bite have negative or positive measurements?
negative
Does an overbite have negative or positive measurements?
positive
What are treatment options for malocclusion?
equilibration, appliance therapy, extractions, or combination of tx
How do slow vs rapid skeletal expanders work?
slow expansion starts working when first placed but then stops working over time
rapid expansion is activated the more you keep working oral cavity
How does the secondary palate fuze?
front to back
How does primary palate fuze?
back to front
If you put a palatal expander after the palate is fused around age 5, what will you move?
only teeth
because palate has already fused
What do you do if you need to expand the palate, but the bones have already fused?
surgery is required. Can only move the palate when the bones have an open suture
What is pseudo class III?
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
In which class are upper incisors proclined?
class II division I
In which class are upper central incisors lingual inclined and can be overlapped by upper lateral incisors?
class II division II
In which class is there excessive overjet and deep overbite?
class II division I
In which class is there deep overbite?
class II division II
In which class has a shorter upper lip?
class II division I
In which class is there an underdeveloped mandible?
class II division I
