Arrangement for increasing the stress resistance of implants, and one such implant

An arrangement for increasing the stress resistance of upper jaw bone implants comprising:

• an implant having a length which requires that parts of the implant must be given access to a sinus cavity, wherein the implant, at said parts of the implant, comprises a convex or rounded front surface which, upon access to the sinus cavity, lifts a sinus mucous membrane, without piercing the sinus mucous membrane, and thus forms a closed space between the parts and an underside of the mucous membrane, and wherein the implant includes, at least at said parts of the implant, with at least one growth-stimulating substance which interacts with cell-containing body fluid which has penetrated or is penetrating into the closed space, so that new bone is formed around said parts of the implant and thereby increases the stress resistance.