Sintesis, karakterisasi sifat struktural, laju gegradasi, dan biokompatibilitas bahan komposit magnesium - karbonat apatit (Mg-Co3ap) dan potensinya sebagai bahan dasar implan orthopaedi biodegradabel = Synthesis, structural characterization, degradation rate, and biocompatibility of magnesium - carbonate apatite (Mg-Co3ap) composite and its potential as biodegradable orthopaedic implant base material