What type of adhesive would likely be used for a VPS tray?

The correct choice for an adhesive used in conjunction with a VPS (Vinyl Polysiloxane) tray is a rubber base adhesive. VPS materials are known for their excellent dimensional stability, accuracy, and ease of use in dental impressions. Rubber base adhesives provide strong adhesion to various substrates, which is crucial when securing a VPS tray during the impression process. This ensures that the impression material remains in position, capturing details accurately and preventing distortion.

In contrast to other types of adhesives listed, such as iron oxide, silicone, and acidic base adhesives, rubber base adhesives are specifically designed to complement the properties of VPS materials. Iron oxide is used primarily as a pigment and lacks the bonding properties needed for this context. Silicone adhesives are generally not formulated for bonding VPS materials effectively, while acidic base adhesives might cause reactions with the VPS material that can compromise the integrity of the impression.

Overall, rubber base adhesive is the most suitable choice for ensuring a reliable and effective bonding between the VPS tray and the impression material, leading to a high-quality dental impression.