HOSA Dental Terminology Test 2025 – 400 Free Practice Questions to Pass the Exam

The selection of agar as the option that is not a basic type of rubber base is accurate because agar is actually a gelation material derived from seaweed, commonly used in microbiology and dental impressions, but it does not belong to the category of rubber bases.

Rubber bases such as silicone, polyether, and polysulfide are all types of elastomers that provide the necessary properties for making precise and flexible dental impressions. Silicone, for example, is praised for its dimensional stability and ease of use, while polyether is known for its excellent accuracy and hydrophilicity, making it suitable for capturing fine details. Polysulfide, on the other hand, offers good elastic recovery and is often favored for its resilience. In contrast, agar does not exhibit the same elastic properties or composition as these rubber base materials, which is why it stands out from the other three choices as not fitting within this specific classification.