PROBLEM TO BE SOLVED: To provide a dental drill and a perforation method for dental implantation using the dental drill which prevents a necrosis of a gnathic bone by friction heat.SOLUTION: A drill including two cut blades formed symmetrically with respect to a rotational axis and has a tip portion which is thinned. When viewed from the tip portion side, the cut blades includes: a thinning cut blade extending in a shape including a curve toward a drill outer circumferential side from a chisel edge and a main cut blade extending from an end of the thinning cut blade to the drill outer circumferential edge. The drill includes: a first drill in which a thinning face formed by the thinning cut blade is formed in a substantially parabolic shape which inclines in a drill shaft direction when viewed from a drill front side and second and third drills in which a diameter of the tip portion is smaller than a drill diameter, an inclined part is provided, a relief angle β is provided only on an outer circumference, outer circumferential grooves are provided on both sides of the two cut blades, and a drill diameter is larger than the first dental drill.SELECTED DRAWING: Figure 17COPYRIGHT: (C)2018,JPO&INPIT【課題】摩擦熱により顎骨が壊死することのない、歯科用ドリル及び該歯科用ドリルを用いた歯科インプラント埋込のための穿孔方法を提供すること。【解決手段】回転軸対称に形成された2つの切刃を有し、先端部にシンニングが施されているドリルであって、切刃がドリル先端側から見た時、チゼルエッジからドリル外周側に向けて曲線を含む形状に延びるシンニング切刃と、シンニング切刃の端部からドリル外周端まで延びる主切刃とからなり、シンニング切刃により形成されたシンニング面が、ドリル正面側から見たとき、ドリル軸芯方向に対して傾斜した略放物線状に形成される第1の歯科用ドリルと、先端部の直径がドリル直径よりも小さく、傾斜部を備え、逃げ角βが傾斜部の外周にのみ設けられ、外周溝が2つの切刃の両側に設けられ、ドリル直径が第1の歯科用ドリルよりも大きい第2及び第3の歯科用ドリルとする。【選択図】図17
