PHYSIOLOGIC TOOTH MOVEMENT─ ERUPTION AND SHEDDING by ugg51907

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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
      hosech@kmu.edu.tw
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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