Enamel 1 (Abdullah Akbar)

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Enamel 1 (Abdullah Akbar)

  1. 1. ENAMEL 1st Year BDS 17-03-14
  2. 2. Slide Preparation Practical: Roll # Group 1st Turn 2nd Turn 3rd Turn 1 - 10 A 3-Jan 4-Jan 3-Jun 11 - 20 B 1-Feb 2-Feb 4-Jun 21 - 30 C 3-Feb 4-Feb 5-Jun 31 - 40 D 1-Mar 2-Mar 1-Aug 41 - 50 E 3-Mar 4-Mar 2-Aug 51 - 60 F 5-Mar 2-Apr 3-Aug 61 - 70 G 3-Apr 4-Apr 4-Aug 71 - 80 H 1-May 2-May 1-Sep 81 - 90 I 3-May 4-May 2-Sep 91 - 100 J 1-Jun 2-Jun 3-Sep
  3. 3. Structure of Enamel
  4. 4. Introduction Definition: The hardest mineralized tissue which covers the dentin in the crown portion of the tooth is called enamel. Physical & Chemical Properties  Living or non-living  Thickness 2-2.5 mm  Brittleness  Permeability  Color  Translucency  Radio-opaque
  5. 5. Composition  Inorganic content: 96% (Hydroxyappatite Crystal)  Organic content: 4% (Enamal proteins & Water)
  6. 6. Enamel Protein  Amelogenins: 90%  Non-amelogenins: 10% Enamelin Ameloblastin (Amelin/Sheathlin) Tuftelin
  7. 7. Enamel Protein  Non collagenous proteins  Enzymes for degradation (Enamelysin & Kallikrein4 (KLK4)  Noval secretory proteins (Amelotin & Apin)
  8. 8. Mano is my friend!!!!
  9. 9. Structure Enamel rods • Fish scale appearance • Key hole appearance Cross striations Striae of retzius Hunter-schreger bands Gnarled enamel DEJ Surface enamel •Perikymata •Enamel cuticle (Nasmyth’s membrane)
  10. 10. Age Changes  Tooth wear (Attrition, Abbrition & Erosion)  Occlusal facets  Discoloration  Color  Reduced permeability  Composition of surface layer
  11. 11. Defects of Enamel 1. Organic defects 2. Developmental defects
  12. 12. Organic Defects Enamel spindles Enamel tufts Enamel lamellae
  13. 13. Developmental Defects A. Hereditary Disturbances in the Structure of Enamel * Amelogenesis imperfecta B. Acquired Disturbances in the Structure of Enamel * Focal enamel hypoplasia * Generalized enamel hypoplasia
  14. 14. Amelogenesis Imperfecta Stages of Development of Enamel 1. Enamel matrix formation 2. Calcification 3. Maturation Types of Amelogenesis Imperfecta 1. Hypoplastic type 2. Hypocalcified type 3. Hypomaturation type
  15. 15. Focal enamel hypoplasia Generalized enamel hypoplasia
  16. 16. Other developmental abnormalities Fluorosis Tetracycline stains
  17. 17. Clinical Considerations  Cavity prep.  Deep fissures  Lamellae  Fluoridation  Acid-etching
  18. 18. Ends
  19. 19. End

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