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Questions and Answers
What is the main structural unit of enamel?
What is the main structural unit of enamel?
- Dentin
- Hydroxyapatite crystals
- Enamel rods (correct)
- Enamel protein
What is the primary component of enamel?
What is the primary component of enamel?
- Organic material
- Water
- Inorganic material (correct)
- Calcium
Which substance cements the enamel rods together?
Which substance cements the enamel rods together?
- Dentin
- Hydroxyapatite crystals
- Enamel protein
- Interrod enamel (correct)
What is the purpose of dentin in relation to enamel?
What is the purpose of dentin in relation to enamel?
What is the specific gravity of enamel?
What is the specific gravity of enamel?
Which area of the tooth offers the greatest resistance due to gnarled enamel rods?
Which area of the tooth offers the greatest resistance due to gnarled enamel rods?
Which part of the tooth does enamel cover?
Which part of the tooth does enamel cover?
What is the specific gravity of enamel?
What is the specific gravity of enamel?
What provides support for enamel?
What provides support for enamel?
What is the basic structural unit of enamel?
What is the basic structural unit of enamel?
What is the composition of enamel?
What is the composition of enamel?
What type of enamel offers the greatest acid resistance due to containing more enamel protein and recrystallized hydroxyapatite crystals?
What type of enamel offers the greatest acid resistance due to containing more enamel protein and recrystallized hydroxyapatite crystals?
Which part of enamel offers the greatest resistance to cusps and incisal areas?
Which part of enamel offers the greatest resistance to cusps and incisal areas?
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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