DANB General Chairside Practice Test

A polyether is classified as which type of impression material?

1. Alginates

2. Elastomeric

3. Cements

4. Thermoplastics

The correct answer is: Elastomeric

A polyether is classified as an elastomeric impression material because it exhibits rubber-like elasticity, allowing it to deform and return to its original shape effectively. Elastomeric materials, including polyether, are characterized by their ability to capture fine details and resist deformation, making them ideal for dental impressions. They are typically used in situations where accuracy and precision are critical, such as in the creation of dental prosthetics or braces. In contrast, alginates, although they are impression materials, do not have the same elastic properties as elastomers and are generally used for preliminary impressions. Cements and thermoplastics serve different purposes in dentistry, with cements primarily used for bonding and thermoplastics for applications that require heat to shape the material. Thus, understanding the classification of materials helps in selecting the appropriate type for specific dental procedures.