Which of the following is not classified as an impression material?

The classification of impression materials is based on their intended use and properties in the dental field. Final impressions are used to create highly accurate replicas of the oral cavity, which are essential for making restorations like crowns, bridges, and dentures. Preliminary impressions serve as a starting point for diagnostic casts and treatment planning. Functional impressions are taken with the purpose of capturing the functional aspects of oral tissues, particularly in cases where the dynamics of the mouth during function need to be considered.

Temporary materials, however, are not classified as impression materials; they are primarily used to create provisional restorations or temporary restorations while a permanent solution is being fabricated. Unlike impressions, which capture details of the dental structures, temporary materials do not serve the same role and are not specifically intended to create a mold for obtaining replicas of dental structures. Therefore, identifying temporary materials as not falling into the impression category is accurate.