Which impression material is a flexible silicone known for accuracy and dimensional stability?

Which impression material is a flexible silicone known for accuracy and dimensional stability?

• A. Alginate
• B. Impression tray
• C. Polyvinyl siloxane
• D. Desensitizer

Answer: (C)

Vinyl polysiloxane, a flexible silicone impression material, is known for its accuracy and dimensional stability. It cures with minimal shrinkage and captures fine details well, making it a reliable choice for final impressions. It also offers a range of viscosities and good tear resistance, which helps preserve details when removing the impression from the mouth. Alginate is less dimensionally stable and more prone to distortion over time, so it’s typically used for preliminary impressions. A desensitizer is a topical agent, not an impression material, and an impression tray is the device that holds the impression material.

Vinyl polysiloxane, a flexible silicone impression material, is known for its accuracy and dimensional stability. It cures with minimal shrinkage and captures fine details well, making it a reliable choice for final impressions. It also offers a range of viscosities and good tear resistance, which helps preserve details when removing the impression from the mouth. Alginate is less dimensionally stable and more prone to distortion over time, so it’s typically used for preliminary impressions. A desensitizer is a topical agent, not an impression material, and an impression tray is the device that holds the impression material.