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Dentin

 September 11, 2013 |  admin |  Lecture series, Faculty Development Program Series
Questions
Answers
The approximate
number of tubules in inner dentin is
50,000 per sq
mm
The approximate
number of tubules in middle of dentin is about
40,000 per sq
mm
The secondary
curvature of dentinal tubule sometime coincide with adjacent dentin tubule,
giving a appearance of line crossing dentin is
Contour line of
Owen
As compared to
intertubular dentin, Peritubular dentin lacks a
Collagenous
fibrous matrix
The type of
dentin seen in routine demineralized section is 
Intertubular
dentin
During routine
demineralization, the type of dentin lost is
Peritubular
dentin
The cause of
loss of peritubular dentin in conventional demineralizaton is
Its lack of
collagen, that imparts the stability
The mineral
component of peritubular dentin is
Carbonated
appatite
The difference
between crystalline forms of peritubular and intertubular dentin is
Peritubular
dentin has predominantly hexagonal shapped crystallites while intertubular
dentin crystallites appears as compact platelets
In peripehral
or mantle dentin, peritubular dentin occupies
Two thid of
entire cross section of dentin.