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PHYSIOLOGIC TOOTH MOVEMENT─ERUPTION AND SHEDDING 高雄醫學大學 兒童牙科 陳弘森 07-3121101-7008, 7020 email@example.com Eruption Movement of a tooth through the jaw into the oral cavity. Pattern of tooth movement 1. preeruptive movement 2. eruptive movement 3. posteruptive movement Histology of tooth movement Preeruptive phase Eruptive phase Posteruptive phase Preeruptive phase Bodily movement Excentric growth bony remodeling osteoclast Eruptive phase Root formation Periodontal ligament Dento-gingival juction Posteruptive phase Condylar growth Jaw bone growth Direction of tooth movement Axial Drifting Tilting Rotating Tooth eruption mechanism The push mechanism The pull mechanism Push mechanism Root growth (Pierce 1887) Vascular pressure (Constant 1900) Bone growth (Brash 1928) Cellular proliferation (Eidmann 1923) Dental follicle Pull mechanism Collagen maturation (Thomas 1967) Fibroblasts (Ness 1967) Eruption rates Mouse Guinea pig 200-1100 μ m/day Rabbit Human 140 μ m/day (5 μ m/day) Clinical consideration Early eruption Delayed eruption Impacted Shedding(exfoliation) Gradual removal of roots and alveplar bone Shedding of teeth odontoclasts pressure odontoclasts Cementoclas Dentinoclast Histology of shedding Odontoclasts Large multinucleated cell Cytoplasm of vacuole Dense mitochondria Brush border surface Acid phosphatase Odontoclasts resorption bay (Howship’s lacunae) brush border (ruffled border ; microvilli ) acid phosphatase Root resorption resorption period rest period repair period Clincal consideration Remnants of deciduous tooth Retained deciduous tooth Submerged deciduous tooth Thanks for your listening!
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