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Hydroxylapatite (HA) has been shown to be an efficacious bio-implant material in a number of surgical procedures[l]. A problem in the use of this material is that of particle migration away from the implant site. One method to resolve this problem is to mix the HA with calcium sulfate hemihydrate, CaSO4·0.5H2O, and allow the material to set to a gypsum/HA composite monolith[2]. The gypsum is resorbed by the body over a period of weeks, leaving the hydroxylapatite surrounded by newly generated tissue.
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