Frankel Appliance: Mechanism Of Action And Clinical Applications

Frankel Appliance: Mechanism Of Action And Clinical Applications

• Vestibular Area of Operation
  • According to Frankel malocclusion occur due to disturbed muscle imbalance and posture.
  • Buccal shields and lip pads both of them grab labial and buccal muscles and prevent disturbed muscle force to act on teeth.
  • As restrains are removed arches undergo outward movement.
  • In this way it act as oral gymnast device by correcting disturbed muscle posture.
• Anteroposterior Corrections
• • It stimulates the lateral pterygoid muscle and increases its activity. This causes growth of condylar cartilage which leads to the deposition of bone in condyle posteriosuperiorly. This causes sagittal growth of mandible.
• Decrowding at Time of Eruption
• • Vestibular screens should be extended to sulcus and create tension in soft tissues which causes outward bending of thin buccal plate leading to outward drifting of teeth.
• Differential Eruption
• • Differential eruption in case of mandibular molars leads to accurate sagittal relation the value of which is ranges from 1 to 2 mm.
• Restraining Effct on Maxilla
• • The restraining effect lies both over the teeth and maxillary arch.
• Stimulation of Periosteal Matrix
• • As the tension is created due to the extension of buccal shields and lips in vestibule, there occurs periosteal pull which leads to bone deposition.
  • By stimulation of periosteal matrix expansion of maxillary arch and extension of lower anterior part occur.