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Tooth Eruption. Tooth eruption is defined as. “ The movement of a tooth from its site of development within the alveolar process to its functional position in oral cavity,” Massier and Schour, 1941. Active Eruption . Active Eruption & Passive Eruption. Passive Eruption.

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tooth eruption is defined as
Tooth eruption is defined as

“ The movement of a tooth from its site of development within the alveolar process to its functional position in oral cavity,”

Massier and Schour, 1941

s tage of tooth eruption
Stage of tooth eruption
  • Pre-eruptive
  • Intraosseous movement
  • Eruptive mucosal penetration preocclusal eruption
  • Post-eruptive
p re eruptive stage
Pre-eruptive stage
  • Deciduous teeth
  • Permanent teeth
e ruptive stage
Eruptive stage

Mechanism of eruption

p ost eruptive stage
Post-eruptive stage

1. accommodation for growth

2. compensate for occlusal &

interproximal wear (mesial

drift)

3. supraeruption

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ฟันสึก

attrition

abrasion

erosion

factors consideration in tooth eruption
Factors consideration in tooth eruption
  • development of periodontium, root, pulp, alveolar bone
  • speed of eruption
  • events during eruption
    • eruptive pathway: gubernacular canal
    • 3D movement
    • inheritable position
d evelopment of d ental f ollicle
Development of Dental Follicle
  • cementoblasts
  • periodontal ligament
  • alveolar bone
g ubernacular canal

Gubernacular canal

Gubernacular cord

Eruptive Pathway

forces of t ooth e ruption
FORCES of Tooth Eruption
  • Root Formation
  • Pressure( Pulp and Hydrostatic )
  • Periodontal Ligament
  • Bone Remodeling and Dental Follicle
r oot growth
Root growth
  • relation of root growth and eruptive movement:Carlson (1944)
  • remove HERS
  • supraeruption
  • rootless tooth :Gowgiel 1961, 1967

CONTRA

p ulp growth
Pulp growth
  • Antimitotic drugs inhibit mitotic activity of pulp cell :Sicher (1962)Ness & Smale (1959)
  • Vitamin D deficiency & overdose: Bryer
h ydrostatic pressure
Hydrostatic pressure
  • King & Bryer -> sympathetectomy
  • Main (1961) -> Hypotensive drugs
  • Hassel & McMinn (1972) -> measure fluid pressure
p eriodontal ligament
Periodontal Ligament
  • Berkovitz & Thomas (1969) -> root resection
  • Michaeli et al (1982) -> degenerate PDL
  • Ness (1967) -> PLF
  • Bellows et al (1983) -> PLF
d ental f ollicle
dental follicle
  • Control resorption and formation of bone around tooth germ: Cahill & Mark 1974,1980,1983,1987
  • no dental follicle, no eruption
  • PDL , alveolar bone and cementum are derivative of Dental Follicle
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Bone remodeling

  • Apposition & resorption of bone
  • Vit A and D def. Bone growth
  • Metal and Acrylic replica:Marks & Cahill (1984)
molecular biology of bone remodeling
Molecular biology of Bone Remodeling
  • Influx of monocytes at the onset of eruption
  • appearance of osteoclasts
  • signaling molecules
s ignaling m ol ecules
signaling molecules
  • CSF-1
  • EGF
  • IL-1
  • TGF alpha
  • TGF beta-1
problem
Problem ?????
  • In vitro / in vivo
  • nature of experimental animal ……extrapolation
  • experimental design…isolate single system
multifactorial

Conclusion of FORCES of Tooth Eruption

Multifactorial

Multifactorial

(However, “Dental Follicle” Activity & Bone Remodeling have the Highest Potential)

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Clinical Application

1. Timing of Eruption

2. Unerupted Tooth (Embedded)

3. Tooth Impaction

4. Position of newly Erupted Successors

5. Dental Treatment Consideration on

Newly Erupted Tooth

6. Denture and Supra-Erupted Tooth

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Exfoliation or Shedding

( Of Deciduous Teeth )

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Mono-Phyodontism

Di-Phyodontism

Poly-Phyodontism

p attern of s hedding
Patternof Shedding
  • Resorption of roots
    • anterior/posterior
  • Shedding of crown
cause of shedding
Cause of shedding
  • Pressure from permanent teeth
  • loss of bone…weakening of supporter
  • trauma and inflammation…occlusal stress, caries .. Etc.
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Histology of Sheding

- Gubernacular Canal

- Osteoclasts

- Odontoclasts

- PerioDontal Ligament

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Clinical Application

  • Remnants of Deciduous Teeth
  • Retained Deciduous Teeth
  • Submerged Deciduous Teeth