What is the average width of enamel rods______________?
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Answer: B. 5mm
Explanation
Individual enamel rods have a microscopic diameter measuring approximately four to five micrometers. This uniform width allows tightly packed arrangement across the entire thickness of the enamel. Rod dimensions reflect the secretory activity of the Tomes process during matrix deposition. Enamel rods are key histological structures composed of aligned hydroxyapatite crystals. Microscopic analysis reveals a typical keyhole shape in cross-sections of human enamel rods. Apatite crystals run parallel to the long axis of each individual enamel rod.
The rod structure provides exceptional fracture toughness against heavy masticatory forces. Acid etching creates microscopic porosities around enamel rods for adhesive dentistry bonding. Dental caries propagate along the orientation pathways of enamel rods and interrod regions. Ten micrometers exceeds the typical diameter of a standard human enamel rod. Two micrometers is too small to accurately reflect average human enamel rod dimensions. Zero point five micrometers represents subcellular dimensions rather than full rod width.
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Answer: A. Cells of inner enamel epithelium
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Q2. Calcified masses discovered within the periodontal ligament are_____________?
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Answer: A. Cementicles
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Q3. The cell-free zone of the pulp is located____________?
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Answer: B. Below odontoblast
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Q4. Secondary dentin is synthesized by which cells_______________?
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Answer: C. Odontoblasts
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Q5. The connective tissue component of the gingiva is designated as______________?
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Answer: C. Lamina propria
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Q6. Nerve endings and receptors for which modality are present in the dental pulp____________?
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Answer: A. Pain
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