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Development and morphology of primary teeth
- 2. Development of the Child from conception to Three Years Dental Changes
- 3. Development of teeth Germ layer Formative tissue Tooth structure Ectoderm Dental organ ENAMEL Dental papilla DENTIN PULP Mesoderm Dental sac CEMENTUM PERIODONTAL LIGAMENT
- 4. Tooth development Initiation of tooth Odontogenesis-Factors from first arch Ones ability acquired maintained by dental papillary cells
- 5. 6 wks In utero • Tooth Buds • Dental Lamina
- 6. Life Cycle of the Tooth • Growth • Initiation • Proliferation • Histodifferentiation • Morphodifferentiation • Apposition • Calcification • Eruption • Attrition
- 7. Primary Epithelial band/ 6th week Continuous band of thickened epithelium Roughly horse shoe shaped Thickening first seen in ant midline
- 9. Contd thickening of DL in 10 areas of upper/ lower arch Thickenings correspond to position of future primary dentn
- 10. 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
- 12. Histodifferentiation • Bell Stage • Dental papilla • Dental Organ • Dental Sac • Dental Lamina 14th week
- 14. Morphodifferentiation • Advanced bell stage. • Inner enamel epithelium • Formation of Dentin • Fate of the Dental Lamina 18th week
- 16. Apposition • appositional, additive and regular.
- 19. Calcification • Begins at the cusp tips or incisal edges and proceeds cervically
- 21. Lines of Retzius
- 22. Neonatal line
- 23. Stages in tooth growth Morphologic stage physiologic stage Dental 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
- 27. Formation of Single and Multirooted Teeth
- 28. Formation of multirooted teeth
- 29. Eruption of teeth • Pre-eruptive phase • Eruptive Phase (Prefunctional) • Eruptive phase functional
- 31. 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
- 32. Exfoliation of the Primary Tooth • 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.
- 33. Attrition • Normal wearing of the teeth during contact with opposing teeth during occlusion
- 34. • Primate spaces