Tooth Histology: Structure and Composition
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Questions and Answers

What is the primary function of enamel in teeth?

  • To support the structural integrity of the tooth
  • To aid in the process of chewing and grinding food
  • To provide a protective cover to vital tissues of dentin and pulp (correct)
  • To facilitate the exchange of ions within the enamel

    • What is the chemical composition of enamel primarily made of?

  • 60% inorganic substances and 40% organic content
  • 80% water and 20% organic content
  • 100% inorganic substances (Fluoroapatite)
  • 95 to 98% inorganic substances (Hydroxyapatite) (correct)

    • What is the physical unit structure present in human enamel?

  • Dentin tubules
  • Enamel rod or prisms (correct)
  • Pulp capillaries
  • Cementum fibers

    • What happens when fluorides are incorporated into enamel?

    <p>Hydroxyapatite will be converted into fluoroapatite which is more resistant to acids</p> Signup and view all the answers

    What role do micropores in enamel play?

    <p>Form a dynamic connection between the oral cavity and the dentinal tubule fluids</p> Signup and view all the answers

    How much water content forms enamel by weight?

    <p>4%</p> Signup and view all the answers

    What is the natural color of the enamel in the incisal edge and cusp tips?

    <p>Gray or whitish blue</p> Signup and view all the answers

    What happens to the color of enamel when the enamel becomes thinner?

    <p>The color of the dentine shows through and the enamel appears to be darker</p> Signup and view all the answers

    What forms natural cleavage planes through which fracture might occur in enamel?

    <p>Enamel rod boundaries</p> Signup and view all the answers

    What happens if the underlying dentin support is removed, causing the enamel prisms to weaken?

    <p>Undermined enamel occurs</p> Signup and view all the answers

    What occurs during acid etching when bonding to resin composite?

    <p>The enamel rod boundary and central core are differentially soluble</p> Signup and view all the answers

    What provides support for enamel?

    <p>Dentin</p> Signup and view all the answers

    Which type of dentin is formed before and shortly after eruption, usually completed 3 years after tooth eruption for permanent teeth?

    <p>Primary dentin</p> Signup and view all the answers

    Which type of dentin is a continuation of primary dentin formed at a slower rate as the tooth ages even without external stimuli?

    <p>Secondary dentin</p> Signup and view all the answers

    What type of dentin is formed in response to irritation such as abrasion, erosion, attrition, and caries?

    <p>Reparative dentin (tertiary dentin)</p> Signup and view all the answers

    What theory states that pain is transmitted through movements of fluid within dentinal tubules?

    <p>Hydrodynamic theory</p> Signup and view all the answers

    What is the chemical composition of enamel primarily made of?

    <p>Hydroxyapatite</p> Signup and view all the answers

    What is the role of micropores in enamel?

    <p>They create a dynamic connection between the oral cavity and the dentinal tubule fluids</p> Signup and view all the answers

    What occurs during acid etching when bonding to resin composite?

    <p>Fluorides are incorporated into enamel</p> Signup and view all the answers

    Which type of dentin is formed before and shortly after eruption, usually completed 3 years after tooth eruption for permanent teeth?

    <p>Primary dentin</p> Signup and view all the answers

    What happens if the underlying dentin support is removed, causing the enamel prisms to weaken?

    <p>Structural integrity of enamel is compromised</p> Signup and view all the answers

    What type of dentin is a continuation of primary dentin formed at a slower rate as the tooth ages even without external stimuli?

    <p>Secondary dentin</p> Signup and view all the answers

    What is the primary function of dentin in teeth?

    <p>Provides structural support for the enamel</p> Signup and view all the answers

    Which type of dentin is formed as a response to irritation such as abrasion, erosion, attrition, and caries?

    <p>Reparative dentin</p> Signup and view all the answers

    What theory states that pain is transmitted through movements of fluid within dentinal tubules?

    <p>Hydrodynamic theory</p> Signup and view all the answers

    What is the natural color of enamel in areas where there is no underlying dentine?

    <p>Gray or whitish blue</p> Signup and view all the answers

    What happens to the color of enamel as it becomes thinner?

    <p>It becomes darker</p> Signup and view all the answers

    What chemical composition primarily forms dentin?

    <p>75% inorganic material, 20% organic material, and 5% water</p> Signup and view all the answers

    What is the role of dentinal tubules in dentin?

    <p>Contain the cytoplasmic process of an odontoblast + dentinal fluid</p> Signup and view all the answers

    Which type of dentin is laid down particularly on the roof and floor of the pulp chamber as the tooth ages?

    <p>Secondary dentin</p> Signup and view all the answers

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