Abstract: A structure includes a first frame having a shape to fit around, or over, a body part, the first frame further comprising a first surface configured to dock with a docking surface of a second frame configured to receive and support the body part. The structure also includes a material attached to the first frame for fitting to the body part; and at least one attachment mechanism coupled to the first frame and configured to attach the first frame to the second frame when the first surface of the first frame is docked with the docking surface of the second frame, wherein the at least one attachment mechanism is configured to flex or pivot, relative to a lateral edge of the first frame, to attach the first frame to the second frame when the first surface of the first frame is docked with the docking surface of the second frame.

Abstract: A body part positioning table or table overlay includes a planar surface to support a body part. The table or table overlay further includes a first mask mounting system having a first configuration for mounting a first mask that positions and secures the body part relative to the planar surface, and a second mask mounting system having a second configuration for mounting a second mask to position and secure the body part relative to the planar surface.

Abstract: A structure includes a base comprising a first ramp and an opposing, second ramp. The structure further includes a shell frame having an inner surface configured to a shape of a body part and an outer convex surface, wherein the outer convex surface of the shell frame rides upon, and moves relative to, upper surfaces of the first ramp and the second ramp to enable a pitch of the shell frame to be adjusted relative to the base.

Abstract: A structure for positioning a body part includes a support base, and a shell frame having an inner surface configured to a shape of the body part. The shell frame is further configured to ride upon the support base, or upon a carriage that further rides upon the support base, to enable a pitch and/or a roll of the shell frame to be adjusted relative to the support base.

Abstract: A method for forming a preform for a thermoplastic retention device is provided. The method includes providing a thermoplastic base material and blending the base material with one or more chemical agents to form a polymer blend. The chemical agents are configured to modify a polymer chain of the base material when the polymer blend is exposed to radiation. The method further includes forming the polymer blend into a filament sized for a three-dimensional printing platform and printing a preform shape from the filament using the three-dimensional printing platform. After the printed preform is hardened, the method includes exposing the printed preform shape to radiation sufficient to cause a reaction between the one or more chemical agents and the base material.