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Questions
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Answers
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Absence of Tomes process in first and final stage of enamel
deposition causes |
Deposition of non-prismatic enamel. Hence the outermost and inner
most layer of enamel formed is highly mineralized. |
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Average width of cross striation in enamel rods
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3 to 6 micrometers
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short period deposition of incremental lines are commonly called as
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cross striations
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Long period records of incremental lines are commonly called as
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Striae
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Number of cross striation in an average human teeth
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7 to 10 cross striations
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Average distance between 2 cross striations is
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4 micrometers
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Average distance between 2 striae is
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25 to 35 micrometers
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In deciduous teeth enamel striae and perikymata can be best observed
along |
cervical enamel
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what is enamel cap
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Along lateral surface, small elevations of 10 to 15 micrometers of
radius of enamel deposition over minute non-mineralizable deposits, often at areas of late development in surface of enamel. These are electron microscopical structures |
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What is enamel focal holes
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Loss of enamel caps and underlying material by attrition or abrasion
leads to openings in enamel called as focal holes. These are electron microscopical structures |
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What is enamel brouchs
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large surface elevations like an enamel cap, 30 to 50 micrometers in
diameter, often with fine radiation groups of crystals – These are electron microscopical structures. |
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The thickness of layer of the characteristic scalloping of DEJ is
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25 to 100 micrometers
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The DEJ is highly scalloped
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Beneath the cusps and incisal edges. It is the area of concentration
of shear forces. |
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The DEJ is relatively smoother
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in lateral surface of coronal enamel
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What is the size of microscallops in DEJ
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2 to 5 micrometers
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average distance between two enamel tuft is about
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100 micrometers
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The protein content of enamel is highest along
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enamel tufts
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Structure of enamel best visualized in longitudinal section is
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enamel spindles
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Structure of enamel best visualized in transverse section is
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enamel tufts and enamel lamellae
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In which stage of amelogenesis does enamel knot formation occur
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presecretory stage. Includes morphodifferentiation and
histodifferentiation stages |
Prof. Rooban Thavarajah
Oral and Maxillofacial Pathologist
List