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

Abstract

An arrangement and an implant are provided for increasing the stress resistance of the implant arranged in an upper jaw bone ( 1 ). The implant has access via parts ( 9, 4′ ) to the sinus cavity ( 5 ). At said parts, the implant is arranged with a convex or rounded front surface which, upon access, lifts the sinus mucous membrane, without piercing the latter, and thus forms a closed space ( 7 ) between the parts and the underside of the mucous membrane. The implant is provided, at least at said parts, with growth-stimulating substance or substances ( 15 ) which interact with cell-containing body fluid ( 8 ) which penetrates or has penetrated into the space, so that new bone ( 11 ) is formed around said parts of the implant.

1 . 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.  
   
   
       2 . The arrangement of  claim 1 , wherein the convex or rounded front surface ( 4 ) and at least one contiguous outer surface of the implant situated in the sinus are coated with layers of the at least one growth-stimulating substance.  
   
   
       3 . The arrangement of  claim 2 , wherein at least sides of said convex or rounded front surface and contiguous outer surface include a rough outer layer or a porous outer oxide layer functioning as a reservoir for said at least one growth-stimulating substance.  
   
   
       4 . The arrangement of  claim 1 , wherein the implant is made of titanium and is coated with the at least one growth-stimulating substance along most of said length.  
   
   
       5 . The arrangement of  claim 1 , wherein the at least one growth-stimulating substance comprises one or more of the following: matrix molecules, growth factors, differentiation factors and peptides with growth-stimulating properties.  
   
   
       6 . The arrangement of  claim 1 , wherein the implant is arranged in an upper jaw bone with reduced height.  
   
   
       7 . The arrangement of  claim 1 , wherein, in an initial stage, outer parts of the implant include a mechanical anchoring member which can be connected on or at an outer surface of a jaw bone.  
   
   
       8 . The arrangement of  claim 1 , wherein the implant can be given an anchoring which is dependent on a degree of insertion of the implant in the sinus, wherein, a greater degree of insertion provides a greater volume for the enclosed space for body fluid and the interaction between the at least one growth-stimulating substance and substances and cells in the body fluid, which provides a greater area of formation of new bone.  
   
   
       9 . The arrangement of  claim 1 , wherein the arrangement comprises a member which can be introduced into a jaw bone hole extending from an outer surface of a jaw bone and opening into the sinus on an underside of the sinus mucous membrane, wherein, in an inserted position below said underside of the sinus mucous membrane, the member is designed to effect at least one rotation movement as a function of a turning action, and wherein one or more front parts of the member are designed to pass in between a boundary wall of the sinus or jaw bone and the underside of the mucous membrane and, upon said at least one rotation movement, to free or release the sinus mucous membrane from the boundary wall.  
   
   
       10 . An implant, comprising a convex or rounded front surface which is designed to cooperate with a sinus mucous membrane in the sinus, via an underside of the sinus mucous membrane, to form an enclosed space between the implant and an underside of the mucous membrane, wherein at least the front surface and parts of the implant which penetrate or have penetrated into the sinus are coated with at least one growth-stimulating substance arranged to interact with cell-containing body fluid ( 8 ) in order to form new bone around the front surface and the parts of the implant which penetrate or have penetrated into the sinus.  
   
   
       11 . The implant of  claim 10 , wherein sides of the front surface and said parts of the implant which penetrate or have penetrated into the sinus have a roughened outer surface or porous outer oxide layer arranged to store said at least one growth-stimulating substance.  
   
   
       12 . The implant of  claim 10 , wherein the implant is made of titanium or ceramic.