A medical implant device including an implant body for implantation in its entirety at an implant site or for manipulation to separate the implant body into multiple smaller pieces, some or all the pieces being used at a single implant site or at multiple different implant sites, the medical implant device comprising: the implant body being a biocompatible, three-dimensional osteoconductive or osteoinductive implant body including mineral particles incorporated within an organic carrier, said body including an upper surface, a lower surface, and side walls interconnecting the upper surface and the lower surface, wherein the implant body is comprised of a biocompatible implant material; and at least one separation-assist line defined in said implant body, said separation-assist line configured to facilitate separation of a first portion of the implant body from a second portion of the implant body by manually manipulating the implant body to separate the implant body into multiple pieces generally along the separation-assist line or lines, wherein the at least one separation-assist line is selected from: (i) a score line that extends from a surface of the implant body and penetrates at least partially through the thickness of the implant body; or (ii) perforations that include a plurality of spaced holes or slits in the implant material, wherein intact implant material is located in regions between the slits or holes extending partially or completely through the implant body; or (iii) a material having the same thickness as surrounding regions but being more fragile, tearable or breakable than the surrounding regions; or (iv) a combination thereof, wherein said organic carrier provides a resorbable matrix comprising both fibrillar and non-fibrillar collagen. the implant body being a biocompatible, three-dimensional osteoconductive or osteoinductive implant body including mineral particles incorporated within an organic carrier, said body including an upper surface, a lower surface, and side walls interconnecting the upper surface and the lower surface, wherein the implant body is comprised of a biocompatible implant material; and at least one separation-assist line defined in said implant body, said separation-assist line configured to facilitate separation of a first portion of the implant body from a second portion of the implant body by manually manipulating the implant body to separate the implant body into multiple pieces generally along the separation-assist line or lines, wherein the at least one separation-assist line is selected from: (i) a score line that extends from a surface of the implant body and penetrates at least partially through the thickness of the implant body; or (ii) perforations that include a plurality of spaced holes or slits in the implant material, wherein intact implant material is located in regions between the slits or holes extending partially or completely through the implant body; or (iii) a material having the same thickness as surrounding regions but being more fragile, tearable or breakable than the surrounding regions; or (iv) a combination thereof, (i) a score line that extends from a surface of the implant body and penetrates at least partially through the thickness of the implant body; or (ii) perforations that include a plurality of spaced holes or slits in the implant material, wherein intact implant material is located in regions between the slits or holes extending partially or completely through the implant body; or (iii) a material having the same thickness as surrounding regions but being more fragile, tearable or breakable than the surrounding regions; or (iv) a combination thereof, wherein said organic carrier provides a resorbable matrix comprising both fibrillar and non-fibrillar collagen.