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Digestion: Chewing & Dissolving

Digestion: Chewing & Dissolving. 11 - 23. Differences between primary and permanent teeth (11). Primary and permanent dentitions have formed by age 21 Primary – 20 deciduous teeth that erupt at intervals between 6 and 24 months

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Digestion: Chewing & Dissolving

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  1. Digestion: Chewing & Dissolving 11 - 23

  2. Differences between primary and permanent teeth (11) • Primary and permanent dentitions have formed by age 21 • Primary – 20 deciduous teeth that erupt at intervals between 6 and 24 months • Permanent – enlarge and develop causing the root of deciduous teeth to be reabsorbed and fall out between the ages of 6 and 12 years

  3. All but the third molars have erupted by the end of adolescenceThere are usually 32 permanent teeth

  4. Functional & structural differences between the three different types of adult teeth (12) • Incisors – chisel-shaped teeth adapted for cutting or nipping • Canines – conical or fanglike teeth that tear or pierce • Premolars (bicuspids) and molars – have broad crowns with rounded tips and are best suited for grinding or crushing

  5. Parts & function of the adult tooth (13) • Two main regions – crown and the root • Crown: exposed part of the tooth above the gingiva (gum)

  6. (i.e. crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal) • The portion of the tooth embedded in the jawbone

  7. crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal • Constriction where crown & root come together

  8. crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal • Calcified connective tissue – it covers the root and attaches it to the peridontal ligament

  9. crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal • Bonelike material deep to the enamel cap that forms the bulk of the tooth

  10. crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal • Cavity surrounded by dentin that contains pulp • Connective tissue, blood vessels, and nerves

  11. crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal • Portion of the pulp cavity that extends into the root

  12. Dental caries and what causes them. (14) • Gradual demineralization of enamel and dentin by bacterial action

  13. Causes • Dental plaque, a film of sugar, bacteria, and mouth debris, adheres to teeth • Acid produced by the bacteria in the plaque dissolves calcium salts • Without these salts, organic matter is digested by proteolytic enzymes • Daily flossing and brushing help prevent caries by removing forming plaque

  14. Gingivitis (15) • As plaque accumulates, it calcifies and forms calculus, or tartar • Disrupts the seal between the gingivae and the teeth • Puts the gums at risk for infection

  15. Periodontitis (16) • Serious gum disease resulting from an immune response • Immune system attacks intruders as well as body tissues, carving pockets around the teeth and dissolving bone

  16. Digestion in the stomach: type & product (17)

  17. Function of goblet cells (18)

  18. Gastric Pit (18)

  19. Cells & their function in the stomach fundus and body (19)

  20. The stomach does not digest itself! (20)

  21. Major functions of the stomach (21)

  22. Villi – structure & function in the small intestine (22)

  23. Digestive juice – composition & function (23)

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