r jc alveolar bone 02-05-2024dvfdgtrgtrg.pptx

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1. AJODO,1950 AIM: TO DISCUSS THE PERIODONTAL RESPONSE TO THE VARIOUS TOOTH MOVEMENTS

2. The periodontal membrane plays a crucial role for orthodontists when inducing structural changes in the bony alveolus: Transmission of forces: periodontal fibers extend into the alveolar bone, allowing forces applied to the tooth to be transmitted through the periodontal membrane to the alveolus. Altered trabecular framework: transient osseous cellular elements that modify the trabecular framework of the alveolus originate from the periodontal membrane.

3. Necrosis and Regeneration: If the force is excessive or active for a prolonged period, it can lead to necrosis due to a failure of nutritional supply. Bone changes cannot occur until the periodontal membrane regenerates. Dependency on Blood Supply: Resorptive and depository procedures in bone, necessary for tooth movements, rely on the periodontal blood supply.

4. Tipping Tipping movement is produced when a single force is applied against the crown of a tooth When it is done tooth rotates around CO Resistance and PDL gets compressed Necrosis thus induced is rather localized and regeneration of tissue begins. Recovery is faster and damage is less.

5. Bodily movement It i s the simultaneous progression of the crown and apex of the root in the same direction. Blood supply to the periodontal membrane is cut off on the side of pressure. Diminished flow rate in the periodontal vessels occurs on the tension side of the tooth. Regeneration of membrane is slow

6. Intrusion The conical shape of the bony alveolar socket is such that intensive forces against the tooth most effectively cut off the necessary blood supply, hindering tooth movements. Minimal force can compress the periodontal membrane against bone, requiring extensive membrane regeneration and reduced blood flow for bone changes to occur.

7. Extrusion Light Force and Periodontal Changes: With very light force, essential periodontal changes occur quickly, facilitating bone transformations. Increasing force can stretch the fibers, impeding periodontal blood flow once again.

8. Summary In tipping pdl is compressed at the root apex of the same side and crest of the alveolus of the opposite side. Translation or bodily movement of a tooth requires that the PDL space be loaded uniformly from the alveolar crest to the apex. In intrusion, the force is concentrated over a small area at the apex. In extrusion, produce no areas of compression within the PDL, only tension But If the tooth tipped at all while being extruded, areas of compression would be created.