ORAL HISTO MECHANISM OF TOOTH MOVEMENT

• Bone Remodeling theory


  Selective deposition and resorption of bone that brings about the eruption
• Root Growth Theory


  • The proliferating root impinges on a fixed base thus converting an apically directed force into occlusal movement
  • Existence of cushion hammock ligament that straddle the base of the socket from one bony wall to the other like a sling (fixed base)
• Vascular Pressure Theory


  Local increase in tissue fluid pressure in periapical region is sufficient to move the tooth
• Ligament Traction Theory


  • Cells and fibers of periodontal ligament pull the tooth into occlusion
  • As long as periodontal tissue is available, tooth movement occurs
  • The contraction of fibroblast bring about eruptive movements