The invention relates to a crestal implant (1) comprising an elongate anchoring section (2), an implant stump (4) and a transition section (3), wherein said anchoring section (2) has an elongate core (5) from which several ribs (6) extend thus forming rib groups. One or more surfaces (11) which extend in the circumferential direction (U) at a radial reference distance from the longitudinal central axis are provided on the transition section (3). The implant (1) contains plastic material. According to the invention, one or more rib groups, in which the radially outer rib edge (13) of the ribs (6.0) has a radial distance (R0) from the longitudinal central axis (A) of the implant (1), are provided, said radial distance at least approximately corresponding to the radial reference distance, and one or more rib groups are provided within which only some ribs thereof, or within which all the ribs thereof, have on the radially outer rib edges along the entire or partial circumferential extension, a radial distance from the longitudinal central axis which is greater than the radial reference distance.本發明係有關於一種頂部植入物(1),包括:沿縱向(L)延伸的長條形錨定區段(2)、植入物根部(4)、及位於錨定區段(2)與植入物根部(4)之間的過渡區段(3),其中,錨定區段(2)具有長條形芯體(5),自該芯體出發分佈有多個肋片(6),該等肋片形成多個肋片組,而過渡區段(3)上設有一或多個表面(11),該等表面在周向(U)上與其幾何縱向中軸線間隔一段徑向基準距離,此種植入物(1)則具有塑膠材料。本發明設有一或多個肋片組,其肋片(6.0)之徑向外側肋片邊緣(13)與植入物(1)之幾何縱向中軸線(A)的徑向距離(R0)皆等於或約等於徑向基準距離(R),設有一或多個肋片組,此等肋片組內的肋片中,僅有一定數目肋片之徑向外側肋片邊緣在其完全或僅部分周向延伸度上與幾何縱向中軸線的徑向距離,大於徑向基準距離,抑或,該等肋片組內的肋片中,所有肋片之徑向外側肋片邊緣在其完全或僅部分周向延伸度上與幾何縱向中軸線的徑向距離,皆大於徑向基準距離。1...植入物;植牙5...芯體6、6.0...肋片9...芯體10...周向段11...表面17...縱向末端21...溝槽22...襯墊23...突出部24...(第一)長度區段25...(第二)長度區段31...(第三)長度區段A...縱向中軸線L...縱向U...周向r...徑向
