Class II div. 1 Flashcards
What are the causes for class II div. 1?
- Retrognathic mandible (v common)
- Protruded maxilla (less common)
What is the need to treat class II div. 1?
- OJ >9mm 2x likely to encounter TRAUMA
2. AESTHETICS
Which soft tissue feature is commonly associated with class II div. 1?
- Incompetent lips
- Tongue postured between incisors and L lip to achieve AOS
What dental condition may incompetent lips cause?
- Gingivitis due to drying from mouth breathing
What are the treatment options for class II div. 1?
- Accept and monitor (mild, advice re mouth guard for sports)
- Growth modification (functional appliances)
- URA
- Fixed appliances(camouflage)
- Orthognathic surgery
Which malocclusion is commonly treated with functional appliances?
Class II div. 1
can use for div. 2- mild
What types of functional appliances are available?
- Twin block
- Herbst appliance
- Medium opening activator (MOS)
What is the proportional of growth achieved with a functional appliance?
Dental = 75% (move uppers back, lowers forward, tip teeth) Skeletal = 25% (maxillary restraint and encourage mandibular growth)
How do functional appliances work?
DENTAL
- Distal movement of upper teeth
- Mesial movement of lower teeth
- Retroclination of uppers
- Proclinication of lowers
SKELETAL
- Restrain maxillary growth
- Encourage mandibular growth
At what age is the ideal time to use functional appliances?
- During growth (pubertal if possible) ~ 10 yrs
What are the potential problems with functional appliances?
Skeletal effects no maintained in the long term
Which malocclusion is commonly treated with URAs?
- Mild class II
- Class I
Which skeletal class is ideally treated with camouflage?
- Skeletal I
- Mild-mod skeletal II
At what age is the ideal time for orthognathic surgery?
Completed growth >18yrs
What is the aim of pre-orthognathic fixed appliances?
- Align arches
- Coordinate arch width
- Decompensate
