The toxicity of EB─4 color─changing tooth covering material was studied, taking into account domestic and overseas biological evaluation experimental methods for high polymer materials. The results showed that this material had no toxicity, no irritation to eyes or oral membrane,its hemolosis rate was no more than 5‰;no inhibitation effect to the growth of cells.The rate of micronucleated RBC of bone morrow did not increase. Short or long period subcutaneous,implantation of EB─4 color─Changing tooth coverin...
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