Screw set for the bone of this invention is set of the tap and the temporary fixed screw for the bone of the metal make and the fixed screw for the bone which consists of in vivo disassembly absorptive polymer, the mountain path of the latter screw is designated as 0.9 - 1.0 times that of the mountain path of the screw of former, the root diameter of the latter screw is designated as 1.0 times that or less of the root diameter of the screw of former, the axial length which excludes the head of the latter screw is designated as under 1 times that the axial length which excludes the latter head, it is something which pitch of the screw of former and pitch of the latter screw are made identical. With the screw of former formation and temporary fixing of the tap be able to make simultaneous, loosening this screw, after correcting the position relationship of the bone which it should connect, screwing in the latter screw to the bone hole which formed the tap, because this it can lock, the necessity to tighten and/or to loosen the latter screw is gone, the worry where the head of the screw which consists of the latter in vivo disassembly absorptive polymer is destroyed is cancelled.本発明の骨用ネジセットは、金属製の骨用タップ兼仮固定ネジと生体内分解吸収性ポリマーからなる骨用固定ネジとのセットであり、後者のネジの山径を前者のネジの山径の0.9~1.0倍とし、後者のネジの谷径を前者のネジの谷径の1.0倍以下とし、後者のネジの頭部を除いた軸長を後者の頭部を除いた軸長の1倍未満とし、前者のネジのピッチと後者のネジのピッチを同一としたものである。前者のネジでタップの形成と仮固定を同時にでき、このネジを緩めて接合すべき骨同士の位置関係を修正した後、タップを形成した骨孔に後者のネジをねじ込んで本固定できるので、後者のネジを締めたり緩めたりする必要がなくなり、後者の生体内分解吸収性ポリマーからなるネジの頭部が破壊される心配は解消される。
