<正> This experiment was designed to evaluate the osteogenetic effects ofdifferent forms of allogenic decalcified bone matrix.39 rabbits were em-ployed and a bony defect of 1cm in length was made on the shaft of theulnas of the animals.They were divided into 4 groups.In the first group

the bony defects were filled with allogenic decalcified bone powder

in thesecond group

with decalcified bone blocks

in the third group

with unde-calcified bone blocks

and in the fourth group

nothing was filled into thebony defects.Roentgenological and histological studies were made regularly.It was found that after 8-10weeks

70-80% of the bony defects filledwith DBM showed firm union between the host bone and the graftedmaterial and no difference of the osteogenecity could be found between thetwo kinds of DBM

incomplete union occurred in the third group

andnonunion was seen in the fourth group.It is suggested that allogenic decalcified bone powder be used as a graftma-terial to fill up bony defects or cavities because it is easily preparedand used

has good plasticity

and can be stored in room temperature.