There are two methods curing bone damage and decay in clinic: self bone implantation and artificial bone implantation. The former has not been adopted gradually because it is very shorting the body and patients suffer from pain at the operation. It is certain that artificial bone will replace self-bone as implantation. The artificial bone became to be noticed more and more rapidly in the clinic field. Especially as the artificial bone has good biocompatibility, no rejection in the body. In 1978 Rent and other men introduced the hydroxylapatite sinter. It became a new artificial implanted material because it has good biocompatibility and good affinity with bone. Because HAP has little mechanical strength, easy crack and difficult shaping HAP is used only as a filler or mender in the early time in the way of powder or sphere shape.
