Undermining Resorption

Write a short note on undermining resorption.
Answer.

It is also known as indirect resorption or rearward resorption.
It is named by Sandstedt.
It occurs due to the application of extreme forces for the movement of the tooth.
As there is the occurrence of hyalinization, chances of frontal resorption are diminished.
After some days hyalinized zone is invaded by the cells from adjacent normal areas of PDL.
With this osteoclasts also appear in adjacent marrow spaces.
These osteoclasts resorb bone adjacent to the hyalinized PDL zone from the underside. This is known as undermining resorption as bone resorption occurs from the underside of lamina dura.
Resorption of bone occurs from the endosteal part.
Undermining resorption occur in all the cases where the root is not moved parallel to bony surface with too much compression.

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