Formation of Permenant tooth, root and supporting tissues

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Formation of Permenant tooth, root and supporting tissues

  1. 1. It is you (Allah) that we worship and it is you (Allah) from whom weseek help!
  2. 2. FORMATION OFPERMANENT TOOTH ,ROOT ANDSUPPORTING TISSUES
  3. 3. PERMANENT TOOTH FORMATION• Between 20th utero week anf 10 months afterbirth• Arises from dental lamina• Bud on the lingual aspect of deciduous tooth
  4. 4. FORMATION OF PERMANENT MOLARS• Between 20th week of utero(first molar) andafter 5 years of age (third moalr).
  5. 5. ROOT FORAMTION• Two types of roots are formed:1. Single root formatiuon2. Multiple root formation
  6. 6. SINGLE ROOT FORMATION• Initiation from cervicalloop• Hertwig’s epithelialroot sheath
  7. 7. Single Root Formation• Formation of Apical foramen•
  8. 8. ROOT DENTIN• HERS sends inductive signal to ectomesenchymal pulp cells tosecrete predentin by differentiating into odontoblasts
  9. 9. Multiple Root Formation• Epithelial diaphragm of root sheath developstongue type extensions
  10. 10. Multiple Root Formation
  11. 11. Formation of Supporting Tissues1.Bone2.Gingiva3.Cementum4.Periodontal ligaments
  12. 12. Developing of Alveolar bone• Develop by the differentiation of dental folliclecells!
  13. 13. Development Of Gingiva• The fusion of reduced enamel epithelium and oral epithelium at the tootheruption stage• The resulting cuff and epithelium surrounds the neck of the toothdeveloping the gingiva
  14. 14. Formation Of Cementoblast
  15. 15. Periodontal Ligaments
  16. 16. Formation Of PDLStep 1.Organic matrix from rests of malassezStep 2.Mineralization of the matrixStep 3.Anchoring of periodontal ligament(bundle of fibres)

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