Xenografts of Kiel bone in combination with autologous aspirated bone marrow were used to graft 20 cystic defects in the jaws. Sixteen cases (80%) were successful. Results were evaluated by clinical and radiographie follow‐up of the patient up to 4 years (average 2.3 years) after surgery. Inability to create a water‐tight closure followed by immediate secondary infection were considered as the causes for failure rather than rejection by the host.
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