Vulcanization is the process used to harden which type of dental impression material?

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Reversible hydrocolloid materialMercaptan-based impression compoundZinc phosphate dental cementZinc oxide-eugenol pastePolyvinyl siloxane material

Explanation

Vulcanization is a chemical process that hardens mercaptan impression materials by forming cross-links in the polymer chains. This process is specific to mercaptan-based compounds and is not applicable to reversible hydrocolloids, zinc phosphate cement, or zinc oxide-eugenol materials.