AP discrepancies Flashcards
The Class II malocclusion is among the most common developmental anomaly with a prevalence around ___% in most populations.
30%
__% of malocclusions are class 1
70%
___% of class 2 malocclusions are bimaxillary retrusive
40%
Maxillary first molar in a mesial position in relation of the mandibular
first molar.
Class 2
- Convex profile, mandibular retrognathism, variable face height ( dep bite or
openbite ) , Increased overjet
Class II Division 1:
- Straight to convex profile, Lower face height reduces, normal overjet, deep
overbite, upper central Incisors lingually inclined, upper lateral incisors labially
inclined
Class II Div 2
Which division of class 2 is more difficult to treat?
Class II Div 2: genetic
- In severe cases, the lips are usually
incompetent. - Proclination of upper incisors.
- Increased overjet.
- Narrow and tapered upper maxillary arch.
Class 2 Div1
- Vertical dimension of these patients is usually decreased
- Dental crowding is created by the retro inclination of the upper incisors
- Deep overbite caused by the overeruption of upper central incisors
and lower incisors .
Class 2 div 2
How do you classify maxillomandibular relationships in skeletal class 2 relationships?
ANB via ceph
Growing patients: Ideally, treatment of Class II malocclusions should focus first
on improving the _______
skeletal discrepancy.
What functional appliance can be used to shift a class 2 malocclusion to class 1
Headgear
What is necessary most of the time for class 2 skeletals for adults?
Orthognathic surgery
(Removable functional appliance to correct class 2 malocclusions)
_____ is used more often,
which can efficiently promote mandibular growth, restrict further forward
growth of the maxilla, and improve skeletal relationships in growing skeletal
class II individuals with mandibular retrusion.
Twin‐block
Are class 2 elastics good for small or larger class 2 corrections
Smaller corrections
What is usually done to the maxillary arch in addition to the orthognathic surgery in extreme class 2 malocclusions?
Maxillary expansions
What is the most complicated malocclusion to treat?
Class 3
What is the main issue in most cases of class 3 malocclusions?
Maxillary deficiency (70%)
- Extraoral features :
- Concave profile.
- Anterior facial divergence.
- Prominent lower third of face/chin.
- Intraoral features :
- Class III molar and canine relationship.
- Narrow upper arch.
- Decreased or reverse overjet.
- Crowding in upper arch.
Class 3 malocclusion
______ malocclusion is characterized by:
* Anterior crossbite
* Due to a forward functional
displacement of the mandible.
* CR –Co Shift
*Not a true Class III malocclusion
if corrected early
Pseudo-Class III
In most cases, __________ is the main etiological factor of a
pseudo-Class III malocclusion.
retroclined maxillary
incisors
When should pseudo class 3 malocclsions be treated? age
8-9 years old
What is used to correct class 3 malocclusions in growing pts?
Reverse-pull headgear
What can occur with orthodontic treatment of a class 3 malocclusion in regards to elastics and inclination of incisors?
Overproclination of upper incisors and retroclination of lower incisors
