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SCAN0103 - Deciduous Teeth Permanent Teeth Classification...

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Unformatted text preview: Deciduous Teeth Permanent Teeth Classification of Teeth Teeth are classified according to their shape and function Incisors O chisel-shaped teeth adapted for cutting or nipping Canines 9 conical or fanglike teeth that tear or pierce Premolars (bicuspids) and molars 0 have broad crowns with rounded tips and are best suited for grinding or crushing During chewing, upper and lower molars lock together generating crushing force Dental Formula: Permanent Teeth A shorthand way of indicating the number and relative position of teeth Written as ratio of upper to lower teeth for the mouth Primary: 21 (incisors), 1C (canine), 2M (molars) Permanent: 21, 1C, 2PM (premolars), 3M Tooth Structure Two main regions 0 crown and the root Crown 9 exposed part of the tooth above the gingiva (gum) Enamel 0 acellular, brittle material composed of calcium salts and hydroxyapatite crystals is the hardest substance in the body Encapsules the crown of the tooth Root 0 portion of the tooth embedded in the jawbone Tooth Structure Neck 0 constriction where the crown and root come together Cementum 0 calcified connective tissue Covers the root Attaches it to the periodontal ligament Tooth Structure Periodontal ligament Anchors the tooth in the alveolus of the jaw Forms the fibrous joint called a gomaphosis Gingival sulcus 0 depression where the gingiva borders the tooth Tooth Structure Dentin 0 bonelike material deep to the enamel cap that forms the bulk of the tooth Pulp cavity 0 cavity surrounded by dentin that contains pulp Pulp 9 connective tissue, blood vessels, and nerves Root canal 0 portion of the pulp cavity that extends into the root Apical foramen 0 proximal opening to the root canal Odontoblasts 9 secrete and maintain dentin throughout life Tooth Structure Tooth and Gum Disease Dental caries 9 gradual demineralization of enamel and dentin by bacterial action 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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