1. It is you (Allah) that we worship and it is you (Allah) from whom we
seek help!

2. FORMATION OF
PERMANENT TOOTH ,ROOT AND
SUPPORTING TISSUES

3. PERMANENT TOOTH FORMATION
• Between 20th utero week anf 10 months after
birth
• Arises from dental lamina
• Bud on the lingual aspect of deciduous tooth

4. FORMATION OF PERMANENT MOLARS
• Between 20th week of utero(first molar) and
after 5 years of age (third moalr).

5. ROOT FORAMTION
• Two types of roots are formed:
1. Single root formatiuon
2. Multiple root formation

6. SINGLE ROOT FORMATION
• Initiation from cervical
loop
• Hertwig’s epithelial
root sheath

7. Single Root Formation
• Formation of Apical foramen
•

8. ROOT DENTIN
• HERS sends inductive signal to ectomesenchymal pulp cells to
secrete predentin by differentiating into odontoblasts

9. Multiple Root Formation
• Epithelial diaphragm of root sheath develops
tongue type extensions

10. Multiple Root Formation

11. Formation of Supporting Tissues
1.Bone
2.Gingiva
3.Cementum
4.Periodontal ligaments

12. Developing of Alveolar bone
• Develop by the differentiation of dental follicle
cells!

13. Development Of Gingiva
• The fusion of reduced enamel epithelium and oral epithelium at the tooth
eruption stage
• The resulting cuff and epithelium surrounds the neck of the tooth
developing the gingiva

14. Formation Of Cementoblast

15. Periodontal Ligaments

16. Formation Of PDL
Step 1.Organic matrix from rests of malassez
Step 2.Mineralization of the matrix
Step 3.Anchoring of periodontal ligament(bundle of fibres)