| http://www.w3.org/ns/prov#value | - In this French patent it is indicated that the use of material based on these natural skeletons themselves directly for the making of implants, bone substitutes or other prosthetic elements would have several drawbacks, due in particular to the low resistance and high solubility of the natural carbonates like calcite and aragonite which make up the greater part of said marine skeletal materials.
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