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22 Cards in this Set
- Front
- Back
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What tissue covers the crown?
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Enamel.
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What tissue covers the root(s)?
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Cementum.
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The crown and root are joined at what junction?
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Cementoenamel junction.
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What is the cervical line?
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The line that demarcates the cementoenamel junction, which is formed by the junction of the cementum of the root and the enamel of the crown.
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Describe the anatomic crown.
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The whole crown of the tooth that is covered by enamel, regardless of whether it is erupted.
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Describe the clinical crown.
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The clinical crown is only that part seen above the gingiva. Any nonerupted area is not a part of the clinical crown of the tooth.
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Describe the clinical root.
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Any unerupted part of the anatomic crown plus the anatomic root.
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What does a bifurcation or trifurcation mean?
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Division of the root portion into two or three segments. (Remember, each root has ONE apex or terminal end)
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What is the alveolar process?
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The portion of the jaw that supports the teeth.
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What is the alveolus?
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The bony socket in which the tooth fits.
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What are the four tooth tissues?
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Dentin, cementum, enamel, and dental pulp.
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What determines the color of enamel?
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The color of enamel varies with its thickness and mineralization. Thicker = whiter; Thinner = grayish white; More mineralized = more it lends itself to translucency
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What is the chemical composition of enamel?
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96% inorganic, 4% organic matter and water. Enamel is the most densely mineralized and hardest tissue in the human body.
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What tissue comprises the bulk of the tooth?
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Dentin. Dentin is wrapped in an envelope of enamel, which covers the crown, and an envelope of cementum, which covers the root.
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What is the chemical composition of dentin? What color is it?
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Dentin is 70% inorganic and 30% organic matter and water. Dentin is a hard, dense, yellow calcified tissue softer than enamel but harder than bone.
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What is secondary dentin?
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Unlike enamel, dentin is capable of adding to itself. When it does, new dentin is called secondary dentin.
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Where is secondary dentin mainly formed?
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Secondary dentin is formed throughout the pulp chamber AFTER the tooth erupts. In time, secondary dentin could completely fill the pulp chamber.
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What is reparative dentin?
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Dentin that is laid down in response to TRAUMA.
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What is cementum?
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Cementum is a bone-like substance that covers the root, although the root is not covered with a perfect layer of cementum; voids expose small patches of dentin.
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What is the function of cementum?
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Its main function is to provide a medium for the attachment of the tooth to the alveolar bone.
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What is the chemical composition of cementum?
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45-50% inorganic and 50-55% organic components. It is less dense and durable than enamel or dentin but more dense than bone.
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What are the TWO types of cementum?
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1. Cellular Cementum 2. Acellular Cementum
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