Screw thread implant

A - Human Necessities – 61 – C

Patent

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Details

A61C 8/00 (2006.01) A61B 17/86 (2006.01) A61F 2/02 (2006.01)

Patent

CA 2243086

The present invention relates to a thread or oriented macroroughness for bone implants, particularly threaded dental implants, a section of said thread or roughness (i.e. the profile) comprising two flanks, a top radius R at the apex formed by the intersection of said two flanks, a bottom radius r formed at the bottom of the groove between two adjacent threads or roughnesses, said flanks forming an angle v with a plane which is perpendicular to a cross section of said thread or roughness and perpendicular to the surface of the implant body, said profile further having a height D. According to the invention the dimensions of the thread or roughness are subject to the following restrictions: for 10°<= v < 35°, R is greater than 0.4 x D and that, for 35°<= v <= 55°, R is greater than 0.2 x D. In a preferred embodiment the restrictions are: for 0.05 mm <= D <= 0.5 mm and 35° <= v <= 55°, the top radius R is larger than 0.2 x D but smaller than D, and in that, for 0.25 mm <= D <= 0.5 mm and 10°<= v < 35°, R is greater than 0.4 x D but smaller than D.

Filetage ou profil rugueux orienté pour implants osseux, notamment pour implants dentaires vissables. Une partie de ce filetage ou de ce profil rugueux se compose de deux flancs, d'un rayon supérieur R au niveau du sommet constitué par l'intersection des deux flancs, un rayon inférieur r défini au fond de la rainure comprise entre deux filets adjacents ou deux rugosités adjacentes, les flancs constituant un angle v par rapport à un plan perpendiculaire à la section transversale du filetage ou du profil rugueux et perpendiculaire également par rapport à la surface du corps de l'implant, ce profil présentant en outre une profondeur D. Les dimensions du filetage ou des rugosités sont en outre soumis aux conditions suivantes: pour 10 DEG </= v < 35 DEG , R est supérieur à 0,4 x D et pour 35 DEG </= v </= 55 DEG , R est supérieur à 0,2 x D. Selon un mode de réalisation préféré, les conditions sont: pour 0,05 mm </= D </= 0,05 mm et 35 DEG </= v </= 55 DEG , le rayon supérieur R est supérieur à 0,2 x D mais inférieur à D et, pour 0,25 mm </= D </= 0,5 mm et 10 DEG </= v < 35 DEG , R est supérieur à 0,4 x D mais inférieur à D.

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