Which elastomer types are considered hydrophobic?

The correct choice identifies condensation silicon as a hydrophobic elastomer type. Condensation silicones, also known as addition silicones, have a structure that repels water due to their hydrophobic properties. This characteristic allows them to resist absorption of moisture, making them suitable for use in environments where water exposure can be an issue.

While polyether and polysulfide elastomers can absorb some moisture, condensation silicones do not interact with water in the same way, ensuring better dimensional stability and reduced distortion over time. This property is particularly valuable in dental applications where moisture can impact accuracy and performance.

Furthermore, understanding the hydrophobic nature of condensation silicones is vital in selecting appropriate materials for specific dental procedures, ensuring longevity and reliability in dental impressions or prosthetics.