Porous and granular hydroxylapatite (HAP) was implanted in bone defects resulting from oral surgery in 21 patients and from periodontal disease in 14 patients. Excellent results were obtained, the overall clinical usefulness being 91.4%. HAP leakage after implantation was observed in a small number of cases; however, there was almost no wound infection or failure to heal. A series of x-rays confirmed its good adaptation to the bone.
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