NEET MDS

The Power Course

Which of the following is not a feature of enamel:



Choices

1 ) Semi permeable
2 ) Plastic
3 ) Elastic
4 ) Translucent

Explanation


Properties of enamel:

Properties Properties of enamel
Modulus of Hardness (MOH) MOH of enamel is 5-8
Knoop hardness Number (KHN) 200 - 500 KHN
Density

2.8 to 3 gms/dl.

The density of enamel is maximum on the surface.

The density of enamel is less in primary teeth as compared to secondary teeth.

Thickness

Incisal edges - 2 mm

Premolars - 2.3 mm

Molars - 2.6 mm

Modulus of Elasticity (MOE)

MOE is high which makes the enamel rigid substance.

Colour

Enamel is translucent, but it takes the color of the underlying dentin.

Permeability

Enamel is semi-permeable tissue. However permeability of enamel decrease with an increase in age. 

If the fluoride is deposited in the hydroxyapatite crystals then it leads to the formation of fluorapatite which decreases the permeability of enamel resulting in its anti-cariogenic potential.  

Plasticity

Enamel is a plastic dental tissue. 

Whereas dentin is elastic tissue. 


Answer

Elastic

Further Reading


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Last Modified : 08-Dec-2019

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