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Abstract
In 26 patients freeze-dried dura mater (FDDMA) membranes were used in fenestrations
and dehiscences around dental implants, in implants inserted into postextraction sockets,
in vertical ridge augmentation and in sinus lifting procedures. A re-entry procedure
was carried out after 6, 9 and 12 months. In all patients a small portion of the membrane
was removed and examined. No inflammatory infiltrate was present in the tissues around
the membranes. No cells were present inside the membranes and only in the most peripheral
portions was it possible to observe a few cells positive to acid phosphatase. The
FDDMA membranes appeared to resorb slowly, did not seem to elicit an inflammatory
reaction, and at 12 months they still appeared to play a role in cell occlusion.