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Enamel 1 (Abdullah Akbar)
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Enamel 1 (Abdullah Akbar)

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Transcript

  • 1. ENAMEL 1st Year BDS 17-03-14
  • 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. Structure of Enamel
  • 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. Composition  Inorganic content: 96% (Hydroxyappatite Crystal)  Organic content: 4% (Enamal proteins & Water)
  • 6. Enamel Protein  Amelogenins: 90%  Non-amelogenins: 10% Enamelin Ameloblastin (Amelin/Sheathlin) Tuftelin
  • 7. Enamel Protein  Non collagenous proteins  Enzymes for degradation (Enamelysin & Kallikrein4 (KLK4)  Noval secretory proteins (Amelotin & Apin)
  • 8. Mano is my friend!!!!
  • 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. Age Changes  Tooth wear (Attrition, Abbrition & Erosion)  Occlusal facets  Discoloration  Color  Reduced permeability  Composition of surface layer
  • 11. Defects of Enamel 1. Organic defects 2. Developmental defects
  • 12. Organic Defects Enamel spindles Enamel tufts Enamel lamellae
  • 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. 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. Focal enamel hypoplasia Generalized enamel hypoplasia
  • 16. Other developmental abnormalities Fluorosis Tetracycline stains
  • 17. Clinical Considerations  Cavity prep.  Deep fissures  Lamellae  Fluoridation  Acid-etching
  • 18. Ends
  • 19. End