Components of a servosystem
Primary and secondary cartilages
Control of maxillary growth
Control of mandibular growth
Three level arborization
Studies of functional appliance therapy
Mode of action of functional appliances
Last 20 years have seen an increasing awareness of the potential of functional appliances as a valuable tool in the armamentarium of orthodontists.
In late 1960’s Petrovic & co-workers produced first rigorous demonstration that condylar cartilage’s growth rate & amount can be modified by using appropriate functional & orthopedic appliances.
Later he employed the model of cybernetics & control theory to describe craniofacial growth patterns & method of operation of functional & orthopedic appliances.
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