BDEP Lecture 1 — Tooth Structure

By Hakan Gem

Transcript

1. TOOTH STRUCTURE BASIC DENTAL EDUCATION PRINCIPLES LECTURE 1: HAKAN GEM
2. OUR ELEMENTAL COMPOSITION
3. OUR ELEMENTAL COMPOSITION Elements of the Universe Hydrogen Helium Oxygen Carbon Other
4. OUR ELEMENTAL COMPOSITION Elements of the Universe Hydrogen Helium Oxygen Carbon Other Elements of the Human Body Hydrogen Oxygen Carbon Nitrogen Other
5. GENERAL TOOTH STRUCTURE • Main components • Enamel • Dentin • Pulp • Supportive components • Periodontium • Cementum • Gingiva • Alveolar bone • Periodontal ligament
6. GENERAL TOOTH STRUCTURE • Main components • Enamel • Dentin • Pulp • Supportive components • Periodontium • Cementum • Gingiva • Alveolar bone • Periodontal ligament
7. TOOTH STRUCTURE: ENAMEL • Origin • Ameloblast cells • Structure • Basic unit: enamel rod and inter-rod • Composition • 97% inorganic mineral (hydroxyapatite) • 2% water • 1% organic material (proteins) • Function • Protection • Mastication
8. ENAMEL ROD AND INTER-ROD Sagittal Cross Section Horizontal Cross Section Ten Cate’s Oral Histology (p.152)
9. TOOTH STRUCTURE: DENTIN • Origin • Odontoblast cells • Structure • Basic unit: dentin tubules • Composition • 70% inorganic mineral (hydroxyapatite) • 20% water • 10% organic material (protein) • Function • Support • Repair
10. DENTIN TUBULES Sagittal cross section Horizontal cross section
11. TOOTH STRUCTURE: PULP • Origin • Fibroblast cells • Structure • Layered • Odontoblast layer • Cell free zone • Cell rich zone • Pulpal core • Function • Nutritive & sensory (neurovasculature) • Protective & formative (odontoblast cells)
12. LAYERS OF THE PULP • Odontoblast layer • Houses odontoblasts producing pre-dentin (13) • Cell free zone • Houses the nerve plexus of Raschkow (12) • Cell rich zone • House fibroblasts and white blood cells (11) • Pulpal core • Similar to cell rich zone • Deepest location of tooth Illustration of pulp Histological section of pulp Ten Cate’s Oral Histology (p. 186)
13. TOOTH STRUCTURE: CEMENTUM • Origin • Cementoblast cells • Structure • Basic units: acellular and cellular • Composition • 45-50% inorganic mineral (hydroxyapatite) • 50-55% water and organic material (protein) • Function • Attachment • Absorb shock
14. CEMENTUM ATTACHMENT Cementum highlighted Cementum within the periodontium
15. GROUP TEACHING ACTIVITY Group 1 Group 4 Group 3 Group 2