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PHYSIOLOGIC TOOTH MOVEMENT ─ ERUPTION AND SHEDDING PowerPoint Presentation
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PHYSIOLOGIC TOOTH MOVEMENT ─ ERUPTION AND SHEDDING

PHYSIOLOGIC TOOTH MOVEMENT ─ ERUPTION AND SHEDDING

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PHYSIOLOGIC TOOTH MOVEMENT ─ ERUPTION AND SHEDDING

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  1. PHYSIOLOGIC TOOTH MOVEMENT─ERUPTION AND SHEDDING 高雄醫學大學 兒童牙科 陳弘森 07-3121101-7008, 7020 hosech@kmu.edu.tw

  2. Eruption • Movement of a tooth through the jaw into the oral cavity.

  3. Pattern of tooth movement • preeruptive movement • eruptive movement • posteruptive movement

  4. Histology of tooth movement • Preeruptive phase • Eruptive phase • Posteruptive phase

  5. Preeruptive phase • Bodily movement • Excentric growth bony remodeling osteoclast

  6. Eruptive phase • Root formation • Periodontal ligament • Dento-gingival juction

  7. Posteruptive phase • Condylar growth • Jaw bone growth

  8. Direction of tooth movement • Axial • Drifting • Tilting • Rotating

  9. Tooth eruption mechanism • The push mechanism • The pull mechanism

  10. Push mechanism • Root growth (Pierce 1887) • Vascular pressure (Constant 1900) • Bone growth (Brash 1928) • Cellular proliferation (Eidmann 1923) • Dental follicle

  11. Pull mechanism • Collagen maturation (Thomas 1967) • Fibroblasts (Ness 1967)

  12. Eruption rates • Mouse • Guinea pig 200-1100 μ m/day • Rabbit • Human 140 μ m/day (5 μ m/day)

  13. Clinical consideration • Early eruption • Delayed eruption • Impacted

  14. Shedding(exfoliation) • Gradual removal of roots and alveplar bone

  15. Shedding of teeth odontoclasts pressure

  16. odontoclasts Cementoclas Dentinoclast

  17. Histology of shedding • Odontoclasts Large multinucleated cell Cytoplasm of vacuole Dense mitochondria Brush border surface Acid phosphatase

  18. Odontoclasts resorption bay (Howship’s lacunae) brush border (ruffled border ; microvilli ) acid phosphatase

  19. Root resorption • resorption period • rest period • repair period