Which of the following is NOT a type of temporary cement used for a temporary crown?

Temporary cements serve a critical purpose in dentistry, particularly for holding temporary crowns in place until a permanent restoration can be made. Among the options listed, silicone is recognized as unsuitable for use as a temporary cement due to its specific properties and application.

Silicone materials are generally used for impressions due to their ability to capture fine details and their elastic properties, but they do not have the adhesive qualities required to secure a temporary crown effectively. They might not provide the necessary retention or stability that is required for a cement. Unlike temporary cements such as Zinc Oxide Eugenol (ZOE), polycarboxylate, and resin, which are designed specifically for adhesion and can temporarily hold crowns in place securely, silicone does not inherently provide this function.

In contrast, ZOE is commonly utilized for its soothing properties on the pulp and good adhesion to tooth structure. Polycarboxylate is also a reliable choice, providing a strong bond to both enamel and dentin. Resins are known for their strength and aesthetic qualities, making them suitable for temporary crowns as well. Therefore, silicone does not fit the criteria of a temporary cement and is correctly identified as the option that does not belong.