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  • Craniofacial growth has been the ground for research for several years, starting from Genetic theory, Sutural theory, Cartilaginous theory, Functional matrix theory, Van Limborg’s theory and now the Cybernetic theory.
  • The Servosystem is a part of the cybernetic theory which describes the craniofacial growth mechanism systematically and also explains the functioning of the various appliance system


  • The number of dividing cells in the condylar cartilage is decreased
  • Vertical growth direction and closing of the Stutzmann angle
  • Decrease in the length of the mandible
  • Complete immobilization and the use of chin cap induces the greatest decrease in the growth rate of condylar cartilage and the lengthening of the mandible

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