PROBLEM TO BE SOLVED: To provide a stopper capable of easily and certainly regulating the depth of penetration into the jawbone of a lost tooth part by the blade part of a drill, which has a flange part projecting at a shank part, only by insertion and attachment from the blade edge side of the drill, regardless of the size of the diameter of the blade part of the drill.SOLUTION: The stopper Y, which is inserted and attached from the blade edge side of the blade part Xc of the drill X having the flange part Xa projecting at the shank part Xb, comprises: a drill blade penetration depth regulating part Ya, which is cylindrically formed in its entirety, has a through hole to be inserted by the blade part Xc of the drill X, and has the height regulating the depth of penetration into the jawbone of the lost tooth part by the blade part Xc of the drill X and a drill holding part Yb, which has a plurality of slits Yba formed along the axial direction thereof from an end on opposite side to the drill blade penetration depth regulating part Ya, and engages with the flange part Xa of the drill X to hold the drill X, detachably by elasticity.COPYRIGHT: (C)2013,JPO&INPIT【課題】フランジ部がシャンク部に突設されたドリルの刃部の直径の大きさに拘わらず、ドリルの刃先側から挿入して取り付けるだけで、ドリルの刃部が欠如歯部の顎骨内に侵入する深さを簡単且つ確実に規制することができるストッパーを提供する。【解決手段】フランジ部Xaがシャンク部Xbに突設されたドリルXの刃部Xcの刃先側から挿入して取り付けられるストッパーYを、その全体を筒状に構成すると共に、ドリルXの刃部Xcを挿通する貫通穴を有し、ドリルXの刃部Xcが欠如歯部の顎骨内に侵入する深さを規制する高さを持つドリル刃侵入深さ規制部Yaと、ドリル刃侵入深さ規制部Yaと反対側の端部から軸方向に沿って複数のスリットYbaが形成されていて、ドリルXのフランジ部Xaに弾性により着脱可能に係合してドリルXを保持するドリル保持部Ybとから構成する。【選択図】図3
