Questions and Answers
What is the primary function of the microscopic pores in enamel?
To selectively allow certain ions to pass through
What is the relationship between the shape of the enamel rods and the enamel prisms?
The shape of the enamel rods determines the shape of the enamel prisms
What is the significance of the inter-rod spaces or sheets in enamel?
They contain organic material essential for enamel formation
What is the significance of the Water+inter-rod spaces in enamel?
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What is the term for the type of permeability exhibited by the microscopic pores in enamel?
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What is the primary reason why ground sections are not suitable for histological study?
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What is the approximate protein content in immature enamel?
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What is the term for the basic structural units of enamel?
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What is the arrangement of crystalites within enamel rods?
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Why are demineralized sections used to study immature enamel?
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What term is used to describe the basic units of enamel composed of multiple crystals?
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What is the shape of the enamel rods in the histological structure of enamel?
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What is the percentage of mineralization in bone?
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What is the term for the lines that appear on the surface of the enamel?
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What is the junction between enamel and dentin called?
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What is the term for the structures that appear as small, rounded, or oval bodies on the surface of the enamel?
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What is the type of mineralization that occurs in utero during embryological stages?
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What is the rate of mineralization in enamel?
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What is the term for the lines that appear as a result of the daily deposition of enamel?
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What is the type of microscopy used to study the structure of enamel in detail?
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What is the term for the small, branching tubules that are sometimes seen in the enamel?
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Study Notes
Enamel Structure Study
- Enamel structure is mainly studied in ground sections, but immature enamel can be studied in demineralized sections due to its high protein content (25-30%).
Enamel Rods (Prisms)
- Enamel rods (prisms) are the basic structural units of enamel, composed of a group of crystalites arranged on top of each other.
- Each rod has microscopic pores, making it semipermeable or selectively permeable, allowing some substances to pass through.
Enamel Formation
- Enamel formation begins in utero during embryological stages (primary mineralization) and continues after birth (secondary mineralization).
- The rate of mineralization is linear for enamel and logarithmic for dentin and bone.
- The process starts with the deposition of organic and inorganic material by ameloblasts, followed by mineralization, which reaches a plateau.
Histological Structure of Enamel
- Enamel rods, Hunter-Schreger bands, gnarled enamel, and aprismatic enamel are all part of the histological structure of enamel.
- Other features include incremental lines, cross striations, striae of Retzius, perikymata, and neonatal lines.
- The surface enamel has pits, caps, focal holes, and enamel brochs.
Studying Enamel
- Ground sections are used to study enamel structure, but they are not suitable for histological study.
- Demineralized sections can be used to study immature enamel, but not for studying enamel structure.
- Electron microscopes can be used to study enamel, especially when studying the organic structure.
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