It can also be applied to the molar part, and further provides artificial dental root which can suppress bone resorption because the shape of the mucous membrane joint part is compatible with the gingiva. An artificial tooth root (10) at least a part of which is embedded in an alveolar bone at a part where a tooth has been lost, the artificial tooth root (10) which is embedded in the alveolar bone and is to be joined to the tooth bone, And a mucous membrane coupling portion (30) provided integrally with the bone joint portion on the side to be inside the oral cavity of the osseointegration portion and to be bonded to the gingiva, wherein the mucous membrane coupling portion has both axial end portions (31) whose outer diameter gradually decreases as approaching from the center portion in the axial direction, and a stepped portion (33) is formed at the connecting portion between the bone coupling portion and the mucous membrane coupling portion.臼歯部にも適用でき、さらに粘膜結合部の形状が歯肉に適合しているために骨吸収を抑制できる人工歯根を提供する。 歯を喪失した部分の歯槽骨に対して少なくとも一部が埋入される人工歯根(10)であって、歯槽骨に埋入されて該歯槽骨に結合すべき部位である骨結合部(20)と、骨結合部の口腔内側となるべき側に該骨結合部と一体に設けられ、歯肉に結合すべき粘膜結合部(30)と、を有し、粘膜結合部は、軸方向両端部から軸方向中央部に近づくにつれ次第に外径が小さくなる形状である凹部(31)を具備し、骨結合部と粘膜結合部との連結部には段差(33)が形成されている。
