Fundamental Concepts in the Treatment of Class II Malocclusion Flashcards
What is a Sved bite plane used for?
Reduction of normal or increased overbite
A Sved bite plane helps in orthodontic treatment by modifying the position of the teeth.
What are the components of a Sved bite plane?
- Baseplate: Clear or tinted acrylic modified anteriorly
- Retention: Adams clasps of 0.7mm Hssw on first permanent molars
- Anchorage: Standing teeth
The Sved bite plane is specifically designed to cap the incisal 1/3 of the incisors.
What is the purpose of inter arch elastics in orthodontics?
To deliver anterior force to mandibular teeth and posterior force to maxillary teeth
This is often referred to as Class II elastics.
True or False: The reduction of overbite must occur before correcting overjet.
True
A deep overbite should be addressed prior to overjet correction.
What factors influence the choice of tooth extraction in the lower arch?
- Degree of crowding
- Severity of anteroposterior discrepancy
The choice of extraction varies based on clinical evaluation.
Which teeth are usually extracted in cases of severe crowding in the lower arch?
First premolars
Extraction decisions are based on the level of crowding present.
What is the function of a fixed appliance in orthodontics?
To camouflage unacceptable skeletal relationships by repositioning teeth
It results in retraction of maxillary teeth and protraction of mandibular teeth.
What are the two main treatment options for orthodontic treatment?
- Without extractions
- With extractions
What is the aim of growth modification in orthodontics?
To alter unacceptable skeletal relationships by modifying facial growth
This is achieved through stimulation of mandibular growth using functional appliances.
List some examples of removable functional appliances.
- Bionator
- Activator
- Frankel
- Twin Block
These appliances help in modifying growth and correcting dental malocclusions.
What are the components of a Roberts retractor?
- Baseplate: Clear or tinted acrylic
- Retention: Adams clasps of 0.7mm Hssw
- Anchorage: Standing teeth
- Force: Labial bow of 0.5mm Hssw
The Roberts retractor is activated every 4-6 weeks.
What is a Hawley retainer used for?
To maintain tooth position after achieving normal occlusion
It is a passive appliance that allows for the reorganization of periodontal tissues.
What are the features of Angle’s Class II Division 2 malocclusion?
- Occurs in 0.1% of Nigerians and 10% of Caucasians
- Upper central incisors are retroclined
- Overbite is usually deep and complete
- Overjet is normal or slightly increased
Lip competence and oral health are typically good in these cases.
What defines Angle’s Class II malocclusion?
The mesiobuccal cusp of the upper first permanent molar is at least half a unit anterior to the buccal groove of the lower first permanent molar
This condition is also referred to as disto-occlusion.
What are the treatment objectives in managing Class II malocclusion?
- Relieve crowding and produce alignment of teeth
- Reduce the overjet
- Correct the incisor relationship
- Reduce the overbite
- Correct the buccal relationship
These objectives guide orthodontic treatment planning.
