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Questions
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Answer
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Organic layer of enamel is also called as
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Integument or Nasmyth membrane
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The space between reduced enamel epithelium and the enamel is
occupied by |
Basal lamina
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Conversion of enamel organ to reduced enamel epithelium is initiated
in |
Cervical margin
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Conversion of enamel organ to reduced enamel epithelium ends at
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Occulusal fissure region
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The stain used to demonstrate reduced enamel epithelium in an
unerupted teeth is |
Alcian blue -aldehyde fuschin
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The thickness of primary enamel cuticle is
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30 nanometers
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Initial mineral crystals of calculus are
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Octocalcium phosphate and dicalcium phosphate dehydrate [brushite]
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Organized calculus has crystals of
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Whitlockite and carbornated hydroxyappatite
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The predominant crystals in subgingival calculus is
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Whitlockite
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The predominant crystals in supragingival calculus are
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Hydroxyappatite and octacalcium phosphate
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The more mineralized plaque is
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Subgingival plaque – 60%; subgingival plaque is 40%
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Factors that promote supragingival calculus deposition are
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Increased salivary pH; escape of dissolved carbondioxide; increased
viscosity; higher Ca:P |
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Factors that promote subgingival calculus deposition is
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Increased alkaline bacterial waste products
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Dentin expands throughout the life at the expense of
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Pulp
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Stress parallel to the direction of dentinal tubules will probably
lead to |
Fractures of dentin
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Collagen in dentin is arranged in
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Network like appearance rather than a bundles as in other tissues
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The role of phospholipids in dentin mineralizing front is
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They help to formation and growth of crystals
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The “crystal ghosts” in mineralizing front of dentin is
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Phospholipids
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In mantle dentin, phospholipids are associated with
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Interglobular dentin
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The approximate number of tubules in mantle dentin is
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20,000 per sq mm
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Prof. Rooban Thavarajah
Oral and Maxillofacial Pathologist
List