The topography of the surface of a variety of polymer mixtures was studied. Large porosities were found in various mixtures of methacrylate polymer powder, anorganic bone, and a foaming agent, N, N'-dinitrosopentamethylenetetramine. The porosities appeared to be linked by smaller spaces and channels that ran through the polymer material. The porosity of the polymer was altered significantly by materials such as anorganic bone or foaming agents, but the composition by percentage did not alter the material structure appreciably.
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