Which elastomeric impression material is ideal for subgingival preparations?

The ideal elastomeric impression material for subgingival preparations is polysulfide. This type of material is known for its excellent flow properties, allowing it to easily adapt to the complexities of the subgingival area. Its working time is relatively long, which provides the clinician ample opportunity to accurately capture the details of the preparation and any adjacent structures that may be involved. Additionally, polysulfide offers good tear strength and dimensional stability, essential factors when dealing with impressions taken in challenging areas like subgingival margins.

Other elastomeric materials, while useful in various scenarios, do not provide the same level of adaptability and flow that polysulfide offers in this specific context. Polyether, for example, while also good for capturing details, may not flow as well in deeper, subgingival preparations. Condensation silicone and addition silicone can provide accurate impressions as well, but they typically do not possess the same combination of flow and long working time as polysulfide, making them less favorable for scenarios where subgingival access is needed.