Enamel 1 (Abdullah Akbar)
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This document provides information about enamel, the hardest mineralized tissue that covers the dentin in tooth crowns. It discusses the physical and chemical properties of enamel, including its composition of 96% inorganic hydroxyapatite crystals and 4% organic materials like enamel proteins. The structure of enamel is described, including enamel rods, cross striations, Hunter-Schreger bands, and the enamel-dentin junction. Age-related changes and defects in enamel like attrition, hypoplasia, and fluorosis are also summarized. The document concludes with brief mentions of clinical considerations for enamel.
Enamel 1 (Abdullah Akbar)
- 2. 際際滷 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
- 5. 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
- 6. Composition Inorganic content: 96% (Hydroxyappatite Crystal) Organic content: 4% (Enamal proteins & Water)
- 7. Enamel Protein Amelogenins: 90% Non-amelogenins: 10% Enamelin Ameloblastin (Amelin/Sheathlin) Tuftelin
- 8. Enamel Protein Non collagenous proteins Enzymes for degradation (Enamelysin & Kallikrein4 (KLK4) Noval secretory proteins (Amelotin & Apin)
- 9. Mano is my friend!!!!
- 10. 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 (Nasmyths membrane)
- 11. Age Changes Tooth wear (Attrition, Abbrition & Erosion) Occlusal facets Discoloration Color Reduced permeability Composition of surface layer
- 12. Defects of Enamel 1. Organic defects 2. Developmental defects
- 13. Organic Defects Enamel spindles Enamel tufts Enamel lamellae
- 15. 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
- 16. 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
- 19. Other developmental abnormalities Fluorosis Tetracycline stains
- 20. Clinical Considerations Cavity prep. Deep fissures Lamellae Fluoridation Acid-etching
- 21. Ends
- 22. End