Which statement is true about custom final impressions?

Custom final impressions are often made using materials that allow for accurate and precise capture of the oral tissues to create a detailed mold for restorations, aligners, or dentures. While silicone is a popular choice for impression materials due to its flexibility and dimensional stability, it is not the only material that can be used. Resin-based materials can also be utilized for custom final impressions as they can provide the necessary detail and are compatible with various dental procedures. This versatility in materials is important, as it allows dental professionals to choose the best option based on the specific clinical situation.

The other options present limitations or inaccuracies about custom final impressions. For example, while double-arch trays may be beneficial in some cases, they are not a mandatory requirement for all custom final impressions, making that statement not universally true. Additionally, custom final impressions are indeed used for permanent restorations, contrary to the suggestion that they are not used for such purposes. This further emphasizes the role of custom final impressions in achieving long-lasting dental work.