List
Answers for Enamel -3

Maximum thickness of enamel in deciduous dentition
in molar cusps
1.3 mm
Volume of water in enamel
5 to 10%. This is crucial as a lot of ions cross
in to tooth in liquid medium
Water in enamel is in form of
hydration layer coating enamel crystals and
filling enamel defects
Prism patterns in human enamel
Three types are seen – Pattern 1 – circular;
pattern 2 – prism arranged in parallel rows; pattern 3 – arranged in
staggered row “key hole” pattern
Basic unit of enamel
Enamel prism
Organic material are often accommodated along
enamel prism boundary because of
Microporosity
The predominant pattern of arrangement of enamel
rods in human is
Type III or key hole pattern
Key hole pattern or type III pattern is made by
Large ameloblasts
Small ameloblasts produce
Pattern II or parallel arranged fashion of enamel crystallites
Enamel between prisms are called
Interprismatic enamel
Why does interprismatic enamel have different
optical property
Owing to crystal deviation by 40 to 60 degrees in
orientation. Abnormal abrupt change of orientation responsible for refraction
of light
The angle at which interprismatic crystallites
cross prisms is
60 degrees
Stacks of ______enamel prisms follows are
unidirectional after which they follow different direction
10 to 13 layers
Transversely sectioned zones in Hunter-Schereger
bands are
Diazones
Longitudinally sectioned zones in Hunter-Schereger
bands are
Parazones
The average width of Hunter-Schereger bands are
50 micrometers
The angle between diazones and parazones of enamel
is about
40 degrees
Where will be Hunter -Schreger bands be absent
when all enamel rods runs in same direction, as in
outermost 25% of enamel, the bands will be absent
width of non-prismatic enamel in a newly erupted
teeth
Deciduous 20 – 100 micrometers and permanent teeth
20 to 70 micrometers. Enamel crystallites are aligned at right angle to
surface and hence parallel to each other.
why is the outer most layer of enamel highly
mineralized
Remineralization by saliva; absence of prism
boundaries.

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