[Calcium phosphates in otological surgery. II. The bony integration of calcium phosphates. An experimental study]

Calcium phosphates have been proposed for obliteration of the mastoid cavity as well as TORP and PORP. Their use is based on a very good biocompatibility and host acceptance. The osseous integration of a dense and a porous hydroxyapatite is studied experimentally in artificially created epitympanic holes of rabbits. Osteoneogenesis was observed from the third week after surgery starting from the walls od the defects themselves. This had been evidenced using intravital fluorescent dyes. Porous granules showed more "osteoconductivity" in the beginning, probably due to their greater surface area. Bonding osteogenesis with both materials did not show differences after six months. No resorption was observed, excepting remodelation processes.