A security door hinge assembly, comprising: a door frame structure, having at least a head member, a first jamb member and a second jamb member; at least one door leaf (102, 104), comprising: a leaf frame structure, having at least a top rail member, a bottom rail member, a hinge stile member and a second stile member; an inner leaf panel, mounted to a first side of said leaf frame structure and extending past said hinge stile member, so as to form an inner leaf flange; an outer leaf panel, mounted to a second side of said leaf frame structure, opposite said first side, and extending past said hinge stile member, so as to form an outer leaf flange, and wherein, in use, said door leaf is operable between a first closed position and a second open position; at least one body panel, mounted to said first jamb member and extending past said first jamb member, so as to form a body panel flange; a hinge-mount bracket, coupled to said first jamb member, so as to form an open or closed hinge chamber in conjunction with said body panel flange between said first jamb member and said hinge stile; a hinge mechanism, having at least one pivot axis and which is located within said hinge chamber and adapted to pivotally mount said door leaf to said hinge-mount bracket, and wherein, in said first closed position, said outer leaf flange is in an interiorly overlapping engagement with said body panel flange and said inner leaf flange is in an exteriorly overlapping engagement with at least a portion of said hinge mount bracket, so as to prevent access to said hinge mechanism. a door frame structure, having at least a head member, a first jamb member and a second jamb member; at least one door leaf (102, 104), comprising: a leaf frame structure, having at least a top rail member, a bottom rail member, a hinge stile member and a second stile member; an inner leaf panel, mounted to a first side of said leaf frame structure and extending past said hinge stile member, so as to form an inner leaf flange; an outer leaf panel, mounted to a second side of said leaf frame structure, opposite said first side, and extending past said hinge stile member, so as to form an outer leaf flange, and wherein, in use, said door leaf is operable between a first closed position and a second open position; a leaf frame structure, having at least a top rail member, a bottom rail member, a hinge stile member and a second stile member; an inner leaf panel, mounted to a first side of said leaf frame structure and extending past said hinge stile member, so as to form an inner leaf flange; an outer leaf panel, mounted to a second side of said leaf frame structure, opposite said first side, and extending past said hinge stile member, so as to form an outer leaf flange, and wherein, in use, said door leaf is operable between a first closed position and a second open position; at least one body panel, mounted to said first jamb member and extending past said first jamb member, so as to form a body panel flange; a hinge-mount bracket, coupled to said first jamb member, so as to form an open or closed hinge chamber in conjunction with said body panel flange between said first jamb member and said hinge stile; a hinge mechanism, having at least one pivot axis and which is located within said hinge chamber and adapted to pivotally mount said door leaf to said hinge-mount bracket, and wherein, in said first closed position, said outer leaf flange is in an interiorly overlapping engagement with said body panel flange and said inner leaf flange is in an exteriorly overlapping engagement with at least a portion of said hinge mount bracket, so as to prevent access to said hinge mechanism.