When a denture needs relining, what material is commonly used to take the impression?

The commonly used material for taking impressions when a denture needs relining is impression paste. Impression paste is designed to capture the details of the oral tissues accurately, making it ideal for relining procedures. This material provides a more stable and precise impression compared to other materials, ensuring a better fit once the reline is completed.

Impression paste typically contains components that allow it to be moldable and create a strong, accurate replication of the contours and nuances of the gums and mouth, which is critical for the comfortable and functional fit of the denture. Since relining involves modifying the interior surface of the denture to accommodate changes in oral anatomy over time, using a material that adheres well and captures fine details is crucial.

Other materials like alginate may be used in some situations; however, they are generally more suitable for preliminary impressions rather than for the direct relining of existing dentures due to their setting qualities and potential for distortion. Wax is often used for border molding or for other purposes in prosthetics but not as the primary material for relining impressions. Silicone can be an option as well but is less commonly referred to as "impression paste" specifically, which often indicates a certain type of material used in the relining process.