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Dentin

 August 15, 2013 |  admin |  Lecture series, Faculty Development Program Series
Questions
Answer
Organic layer of enamel is also called as
Integument or Nasmyth membrane
The space between reduced enamel epithelium and the enamel is
occupied by
Basal lamina
Conversion of enamel organ to reduced enamel epithelium is initiated
in
Cervical margin
Conversion of enamel organ to reduced enamel epithelium ends at
Occulusal fissure region
The stain used to demonstrate reduced enamel epithelium in an
unerupted teeth is
Alcian blue -aldehyde fuschin
The thickness of primary enamel cuticle is
30 nanometers
Initial mineral crystals of calculus are
Octocalcium phosphate and dicalcium phosphate dehydrate [brushite]
Organized calculus has crystals of
Whitlockite and carbornated hydroxyappatite
The predominant crystals in subgingival calculus is
Whitlockite
The predominant crystals in supragingival calculus are
Hydroxyappatite and octacalcium phosphate
The more mineralized plaque is
Subgingival plaque – 60%; subgingival plaque is 40%
Factors that promote supragingival calculus deposition are
Increased salivary pH; escape of dissolved carbondioxide; increased
viscosity; higher Ca:P
Factors that promote subgingival calculus deposition is
Increased alkaline bacterial waste products
Dentin expands throughout the life at the expense of
Pulp
Stress parallel to the direction of dentinal tubules will probably
lead to
Fractures of dentin
Collagen in dentin is arranged in
Network like appearance rather than a bundles as in other tissues
The role of phospholipids in dentin mineralizing front is
They help to formation and growth of crystals
The “crystal ghosts” in mineralizing front of dentin is
Phospholipids
In mantle dentin, phospholipids are associated with
Interglobular dentin
The approximate number of tubules in mantle dentin is
20,000 per sq mm