Dimensional stability of condensation silicone is less than that of which material?

Condensation silicone is a type of elastomeric impression material that is known for its ability to capture fine details. However, it exhibits dimensional changes over time due to its chemical reactions and the release of by-products during setting. Among the materials listed, polysulfide is known for its superior dimensional stability compared to condensation silicone.

Polysulfide elastomers have a more stable reaction process that allows them to maintain their dimensions better over time, particularly in the presence of moisture. The longer working time and the ability to resist dimensional changes from humidity make polysulfide a preferred choice for situations where high accuracy is required, such as in indirect restorations and prosthodontics.

In contrast, other materials like irreversible hydrocolloid and reversible hydrocolloid typically exhibit greater dimensional changes due to their water content and susceptibility to swelling or shrinkage from environmental factors. Dental plaster, being rigid and non-elastic, does not perform similarly in terms of flexibility and adaptation in the impression process. Thus, it's understood that polysulfide offers better dimensional stability compared to condensation silicone, making the correct answer reflective of this property.