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Questions and Answers
What is the basic structural unit of enamel?
What is the basic structural unit of enamel?
- Dentin
- Hydroxyapatite crystals
- Enamel rods (correct)
- Enamel protein
What is the primary composition of enamel?
What is the primary composition of enamel?
- Organic material
- Dentin
- Inorganic material (correct)
- Cementum
Which part of the tooth provides support for enamel?
Which part of the tooth provides support for enamel?
- Pulp
- Cementum
- Dentin (correct)
- Periodontal ligament
What is the specific gravity of enamel?
What is the specific gravity of enamel?
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Which type of enamel rods offer the greatest resistance to the cusps and incisal areas?
Which type of enamel rods offer the greatest resistance to the cusps and incisal areas?
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What is the function of enamel rod sheaths?
What is the function of enamel rod sheaths?
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Can enamel undergo repair from carious lesions or trauma?
Can enamel undergo repair from carious lesions or trauma?
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Study Notes
- Enamel is the hardest biologic tissue and covers the anatomical crowns of teeth.
- Enamel needs dentin for support and provides the shape and contour of teeth.
- Enamel is non-vital tissue and does not undergo repair from carious lesions or trauma.
- Enamel is permeable to a certain extent and has a specific gravity of 2.8.
- Enamel is composed of inorganic material (96-98%) and organic substance (2-4%).
- Enamel rods are the basic structural unit of enamel and originate at the DEJ.
- Enamel rods have a highly organized pattern of tightly packed hydroxyapatite crystal orientation.
- Gnarled enamel rods offer the greatest resistance to the cusps and incisal areas.
- Enamel rod sheaths contain more enamel protein and recrystallized hydroxyapatite crystals for acid resistance.
- Interrod enamel is the substance that cements the rods together.
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