Treatment of Class II Malocclusion Flashcards
Define class II
Lower incisor occludes behind upper incisor cingulum plateau
What is the main limiting factor in class II treatments?
Skeletal pattern - assess the face
Principles of treating a growing pt with class II div 1?
Functional appliance = good at reducing overjets (unlike straight wire appliances)
Ortho camouflage
Principles of treating a non growing pt with class II div 1?
Ortho camouflage
Orthognathic surgery
Types of functional appliances to treat the growing pt?
Activators - mild non crowded cases
Twin block appliance: severe and crowded cases
Define anchorage
Control of unwanted tooth movement
What does the loss of anchorage cause?
Lack of occlusion in the buccal segments and residual overjet in a class II case
How to plan anchorage?
Lower arch crowding to see how the upper arch will fit
Molar and canine relationship
How to treat no lower crowding with class I molars?
Non extraction and anchorage reinforcement
- Headgear
- Palatal arches
- Implants
- Class II elastics (but can procline the lowers)
How to treat no lower crowding with half class II molars? Name the non compliance appliances
= not enough space to correct crowding and reduce overjet
Non-extraction - distal movement
Extraction upper 7s - distal movement
Extract upper premolars
Non compliance appliances:
- Pendulum appliance
- Distal jet
- Implants
When to move the upper buccal segments of the 7s distally?
Well aligned lower arch
Half unit class II molars
Cooperative pt
How to treat no lower crowding with class II molars?
Headgear
Extract 4s
How to treat lower crowding with class I molars?
Extract upper and lower 4s
How to treat lower crowding with half unit class II molars?
Upper and lower ExLA lower 1s or 2nd molars
How to treat lower crowding with class II molars?
Upper and lower extractions BUT severe anchorage problems as the molars must be changed to class I but not enough space
