Tooth components. Enamel

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1. TOOTH COMPONENTS: ENAMEL Dr. Daniel Ortiz . D.D.S. 2. ENAMEL ENAMEL: Hardest structure of the body; an ectodermal derivative; laid down first as ¨enamelin¨ by the…
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  • 1. TOOTH COMPONENTS: ENAMEL Dr. Daniel Ortiz . D.D.S.
  • 2. ENAMEL ENAMEL: Hardest structure of the body; an ectodermal derivative; laid down first as ¨enamelin¨ by the ameloblast. 1. Color: Yellow White to grayish White 2. Chemical composition: It is 96% inorganic ( main constituent= Hydroxyapatite) , 1 % organic. 3% wáter. 3. 3. Age changes in enamel a. Attrition of wear of oclusal surfaces b. Flattening of perykymata c. Eventual disappearance of the perikymata d. Decreased permeability of enamel e. Teeth become darker .
  • 3. ENAMEL PHSYSICAL PROPERTIES: 1) Is the hardest biologic tissue in the body 2) 2.5 mm ( THICKNESS) Over cusp of molar 3) Knife edge thickness at cervical region 4) Thick at maxillary lingual surfaces of molars and mandibular buccal surfaces. 5) HARDNESS: 296 ( Knoop’s Hardness no.)
  • 4. ENAMEL STUCTURES 1. ENAMEL RODS OR PRISMS 2. HYDROXYAPATITE CRYSTALS 3. THE ROD SHEET 4. INTERPRISMATIC- SUBSTANCE 5. STRIATIONS 6. GNARLED ENAMEL 7. HUNTER-SCHEGER BANDS AND LINES OF RETZIUS 8. NEONATAL LINE 9. PERYKYMATA 10. ENAMEL CUTICLE 11. ENAMEL TUFTS 12. ENAMEL LAMELLAE 13. DENTINOENAMEL JUCTION 14. ENAMEL SPINDLES
  • 5. ENAMEL RODS OR PRISMS
  • 6. ENAMEL RODS OR PRISMS Directions of Enamel RODS comparing DECIDUOUS TOOTH AND PERMANENT TOOTH
  • 7. ENAMEL RODS OR PRISMS
  • 8. HIDROXYAPATITE CRYSTALS
  • 9. THE ROD SHEET
  • 10. INTER-PRISMATIC SUBSTANCE
  • 11. STRIATIONS
  • 12. GNARLED ENAMEL
  • 13. HUNTER-SCHEGER BANDS AND LINES OF RETZIUS A) Hunter-Schreger bands or the lines of Schreger ( HSB) : Enamel prism are arranged in layer of varying thickness at about right angles to each other B: Lines of Retzius: are incremental growth lines or bands seen in tooth enamel. They represent the incremental pattern of enamel, the successive apposition of different layers of enamel during crown formation. Brown lines
  • 14. NEONATAL LINE
  • 15. PERIKYMATA External manifestations of lines of Retzius
  • 16. ENAMEL CUTICLE
  • 17. ENAMEL TUFTS
  • 18. ENAMEL LAMELLAE
  • 19. ENAMEL LAMELLAE
  • 20. DENTINOENAMEL JUCTION
  • 21. ENAMEL SPINDLES Enamel spindles: Some dentinal tubules penétrate a short distance into the enamel across DEJ and end blindly. These spindle-shaped odontoblastic processes are called enamel spindles.
  • 22. COMPARATIVE TABLE
  • 23. COMPARATIVE TABLE 2
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