In a second group we find a condition that appears very similar to the
former except that the fistula tends to be closed and the zone of
rarefaction is surrounded by a zone of condensed bone, with a marked
reduction in the proportion of medullary tissue and an increase in the
osseous tissue immediately adjoining the chamber that has been formed
in the bone about the apex of the infected tooth. The thickness of
this zone of condensed bone varies in proportion to a time factor, as
we shall see.
Answer to “How to prevent Related Degenerative Diseases.
Sung Lee