For different types of porcelain powder or porcelain block, if the chemical composition of one type of product can cover other types of products, for example, A has 10 components and B has 8, all of which are included in the composition of A, and the content of each component contained in B has no increased risk compared with that in A, then it is allowed to select only A for the biocompatibility test. And it is necessary to provide the supporting data demonstrating the influences of differences in the total contents of components between B and A on the safety of the material.
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