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Questions
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Answers
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In which stage of amelogenesis does resoprtion of basal lamina of
inner enamel epithelium occur |
Presecretory stage. During histodifferentiation.
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In which stage of amelogenesis
does initial layer of aprismatic enamel forms |
Secretory stage. This event marks the start of secretory stage
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In which stage of amelogenesis does, ameloblast dies?
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In late secretory stage and the transition stage where
morphologically most of ameloblasts shorten while 50% of them die |
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In which stage of amelogenesis does vascular invagination of enamel
organ occur |
In transition stage
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In which stage of amelogenesis does the basal lamina of ameloblast
reformed |
In transition stage
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In which stage of amelogenesis does matrix secretion ceases
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In transition stage
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In which stage of amelogenesis
does selective matrix withdrawal or resorption occur |
In transition stage
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In which stage of amelogenesis does cycling of ruffled and smooth
bordered ameloblast occur |
in maturation stage
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In which stage of amelogenesis does the full width of immature enamel
matrix is laid down |
In transition stage
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In which stage of amelogenesis does the rough bordered ameloblast
turn smooth |
in maturation stage
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How long does the maturation stage of enamel lasts
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three to four years
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The dimension of differentiated ameloblast is
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60 micrometer in height and 2-4 micrometers in width
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Odontoblast differentiation is mediated by inner enamel epithelium
through |
transforming growth factor – beta
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The pre-ameloblasts releases enzyme by
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exocytosis
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The non-collagenous protein of odontoblast that mediates
epithelium-mesenchymal interaction is |
Dentin sialophosphoprotein
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In aprismatic enamel near DEJ, the enamel crystallites are arranged
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in random orientation
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In aprismatic enamel at peripery [outer surface of crown] , the
enamel crystallites are arranged |
uniformly parallel to each other
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The shape of the Tomes process is responsible for
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prismatic architechture of enamel
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Each enamel prism is formed by
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single ameloblast but four contribute to the interprismatic substance
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The mineralizing front of enamel is observed under electron
microscopy as |
honeycomb pattern
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Ameloblasts are joined to each other by
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terminal bar apparatus distally at the base of the Tome’s process
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The juntion of terminal web apparatus of ameloblsts is
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Zonular in nature
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Cell junction at basal end of ameloblasts [near to st.intermedium]
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Macular in nature
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The prism boundaries of enamel
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are formed first giving the deveeloping enamel front a pit-like
surface appearance |
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Initiation of mineralization of enamel is mediated by
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Dentin sialophosphoprotein
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Ameloblastin determines
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the prismatic pattern
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Enamel crystallite growth and
nucleation of enamel are controlled by |
Tuftlin
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Within the enamel prism, the amelogenin are located in the
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center of the prism. Non-amelogenins in periphery of the prisms.
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Number of rows of ameloblasts that are generated each week at cervical
loop is |
seven
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The transcription factor responsible for regulating cell destiny is
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Egr-1
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The gene product that is localized to enamel knot is
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Msx-2
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The regulator of enamel morphogenesis is
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Msx-2
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The commonest site of enamel pearl formation is
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near furcation region in root, nearer to the cervical region
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Prof. Rooban Thavarajah
Oral and Maxillofacial Pathologist
List