Dentin

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