National Dental Assisting Examining Board (NDAEB) Practice Exam

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What is the reaction called that changes elastomeric impression materials from paste into a rubberlike material?

Vulcanization
Polymerization
Condensation
Hydration

The correct answer is: Polymerization

The process that changes elastomeric impression materials from a paste into a rubberlike material is known as vulcanization. Vulcanization is a chemical process that involves the addition of heat and/or sulfur to the elastomer, allowing it to cross-link and form a stable, rubbery structure. This process enhances the material's strength, elasticity, and resistance to deformation. While polymerization is a broader term that refers to the chemical reaction where monomers combine to form a polymer, vulcanization specifically applies to the process that improves the characteristics of elastomers used in dental impressions. Therefore, understanding the distinct role of vulcanization is crucial, as it directly relates to the functionality and quality of impression materials used in dentistry.