WorksheetsGross anatomy & histology of dental structure I - E Learning
Total questions: 30
Worksheet time: 30mins
As a result of aging, the dental pulp in human permanent teeth
increase in size and becomes more vascular.
becomes less cellular and more fibrous.
becomes more cellular and contains more ground substance.
becomes more vascular and contains larger neural elements.
Extracellular matrix of the connective tissue of the pulp is composed of
collagen fibers
ground substance
collagen fibers and ground substance
none of the above
Which of the following is not a feature of enamel?
Contour lines of Owen.
Cross striations.
Prism sheath.
Perikymata.
Incremental lines are a result of variation in
Proliferation.
Histodifferentiation.
Morphodifferentiation.
Rhythmic apposition.
The prismatic structure of enamel is due to
variation in the density of organic material.
variation in crystal orientation.
a rhythmic pattern of apposition.
the periodic change in prism direction.
The prismless layer of enamel
is found only in primary teeth.
does not contain prism & prism sheaths.
is found near the amelo-dentinal junction.
contains no hydroxyapatite.
Enamel tufts
contain cellular processes.
can pass to dentin.
are seen in decalcified sections.
are grass like structure.
Neonatal lines are present in
all permanent teeth.
permanent canines.
all deciduous & first permanent molar.
premolars.
The main difference between the rod and the interrod region is
crystal size.
crystal orientation.
crystal composition.
nature of the organic component.
The striae of Retzius
are parallel to the enamel rods.
are parallel to the surface of the enamel in the cervical region.
are not seen in the cuspal one third of the enamel.
seen as concentric rings in a horizontal section of the crown.
The extensions from secretory ameloblast cells that give structure to enamel rods are called
Enamel tuft
Tomes processes
Enamel spindles
Enamel lamellae
Striae of Retzius
result from enamel crack.
separate prenatal from postnatal enamel.
are due to rhythmic apposition of enamel.
are hypermineralized structure.
Enamel Rods -
their number varies in different teeth.
have an average width of 1um.
are Present at the enamel surface.
have a straight course at the cusps of teeth.
Enamel is formed of
76% minerals & 24% organic materials and water.
96% minerals & 4% organic materials and water.
86% minerals & 14% organic materials and water.
99% minerals & 1% organic materials and water.
The prism sheath
is a dense continuous sheath separating rod from inter-rod.
result from abrupt change in crystals orientation.
is more mineralized than rod and inter-rod.
found in prismless enamel.
The perikymata
resulting from changes in direction of enamel rods.
is a highly mineralized outer enamel surface.
is formed of transverse grooves.
found at the cusp tip.
The prism sheath
is a continuous sheath.
is more calcified than the enamel rod.
is less calcified than the enamel rod.
is equally calcified when compared to the enamel rod.
The predominant inorganic portion of enamel is
Calcium.
Carbonate.
Phosphate.
Fluoride.
Incremental lines of Retzius form grooves on the surface of the enamel termed
Perikymata.
Neonatal lines.
Gnarled enamel.
Enamel cuticle
Enamel spindles are formed by
Odontoblastic process.
Ameloblastic process.
Hypocalcified rods.
Cracks.
Unmineralized structures seen in the enamel are
Cross striations.
Enamel tufts.
Incremental lines of Retzius.
Enamel spindles.
Incremental lines of Retzius appear
In dentin.
In enamel.
In cementum.
In bone.
The rod sheath
has cross striations.
is more calcified than the enamel rod.
is less calcified than the enamel rod.
has lesser amount of organic matter than the E. rod.
The direction of enamel rods in general is:
parallel to the outer surface of enamel.
parallel to dentine.
perpendicular to the amelo-dentinal junction.
random.
Primary dentin differs from both secondary and reparative dentin in that:
Its matrix is calcified.
Its inorganic component is hydroxyapatite.
It usually has a greater number of tubules per unit area.
It is produced by mesenchymal cells.
Which of the following is not present within dentin?
Cell bodies.
Hydroxyapatite.
Collagen type I.
Incremental lines.
Human primary dentin contains
Mantle & circumpulpal dentin.
Tomes' process.
Cell bodies.
Atubular dentin.
Which of the following is wrong?
The formation of primary dentin continues throughout life.
Primary dentin contains higher number of tubules per unit volume.
Reparative dentin forms as a response to injury.
Dead tracts are common in secondary than in primary dentin.
Which of the following has the highest mineral content?
Predentin.
Peritubular dentin.
Intertubular dentin.
Cementum.
Dentin is a variety of connective tissue because
elastic and contains mucopolysaccharides.
contains collagen fibers and cell processes.
contains inorganic cells.
has few cells and much intercellular material.
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