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Digestion: Chewing & Dissolving 11 - 23. Differences between primary and permanent teeth (11) Primary and permanent dentitions have formed by age 21 Primary.

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Presentation on theme: "Digestion: Chewing & Dissolving 11 - 23. Differences between primary and permanent teeth (11) Primary and permanent dentitions have formed by age 21 Primary."— Presentation transcript:

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 adolescence There are usually 32 permanent teeth

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5 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

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

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

9 crown, enamel, root, neck, cementum, dentin, pulp cavity, pulp, root canal Constriction where crown & root come together

10 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

11 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

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

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

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

16 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

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18 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

19 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

20 Digestion in the stomach: type & product (17)

21 Function of goblet cells (18)

22 Gastric Pit (18)

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

24 The stomach does not digest itself! (20)

25 Major functions of the stomach (21)

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

27 Digestive juice – composition & function (23)


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