The article briefly reviews the developing history and resourcessituation of Cutta-Percha. It points out that the birth of Gutta-Percha rubber with high elasticity is a sign that the research-development of Gutta-Percha has entered into a new stage. A new concept has been proposed that the critical crosslinking-degree is a key that Gutte-Percha gets high elasticity. The high elasticity of the macromolecule-network made of the order-flexible chain of Gutta-Percha can not be explained by the contribution of d...
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