Development and morphology of primary teeth

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Development and morphology of primary teeth

  1. 1. Development of the Child from conception to Three Years Dental Changes
  2. 2. Development of teethGerm layer Formative tissue Tooth structureEctoderm Dental organ ENAMEL Dental papilla DENTIN PULPMesoderm Dental sac CEMENTUM PERIODONTAL LIGAMENT
  3. 3. Tooth development Initiation of toothOdontogenesis-Factors from first archOnes ability acquired maintained by dental papillary cells
  4. 4. 6 wks In utero• Tooth Buds• Dental Lamina
  5. 5. Life Cycle of the Tooth• Growth• Initiation• Proliferation• Histodifferentiation• Morphodifferentiation• Apposition• Calcification• Eruption• Attrition
  6. 6. Primary Epithelial band/ 6th week Continuous band of thickened epithelium Roughly horse shoe shaped Thickening first seen in ant midline
  7. 7. Contd thickening of DL in 10 areas of upper/ lower archThickenings correspond to position of future primary dentn
  8. 8. Proliferation• Multiplication of the cells of the initiation stage• Formation of the tooth germ• Cap Stage• formation of the Dental Papilla• Stellate reticulum – Enamel pulp• 9-11 weeks
  9. 9. Histodifferentiation• Bell Stage• Dental papilla• Dental Organ• Dental Sac• Dental Lamina14th week
  10. 10. Morphodifferentiation• Advanced bell stage.• Inner enamel epithelium• Formation of Dentin• Fate of the Dental Lamina18th week
  11. 11. Apposition• appositional, additive and regular.
  12. 12. Calcification• Begins at the cusp tips or incisal edges and proceeds cervically
  13. 13. Lines of Retzius
  14. 14. Neonatal line
  15. 15. Stages in tooth growthMorphologic stage physiologic stageDental lamina and Bud stage Initiation Cap stage Proliferation Bell stage[ Early] Hiisto defferentiation Bell stage {advanced} Morpho defferentitiation Formation of enamel Apposition and dentin matrix
  16. 16. Formation of Single and Multirooted Teeth
  17. 17. Formation of multirooted teeth
  18. 18. Eruption of teeth• Pre-eruptive phase• Eruptive Phase (Prefunctional)• Eruptive phase functional
  19. 19. Theories of Eruption• Root Formation Theory• Proliferation of the Hertwig’s Epithelial Root Sheath• Proliferation of the connective tissue of the papilla• Simultaneous growth of the jaw• Pressures from muscular action• Apposition and resorption of bone
  20. 20. Exfoliation of the PrimaryTooth• Pressure on the roots by the erupting permanent tooth• Development of osteoclasts• Successive resorption of tooth root, cementum, dentin and adjacent bone due to the action of the osteoclasts.
  21. 21. Attrition• Normal wearing of the teeth during contact with opposing teeth during occlusion
  22. 22. • Primate spaces

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