Which storage condition for elastomeric impressions helps maintain dimensional stability?

• A. Direct heat
• B. Sealed container away from heat and moisture
• C. Exposed to air
• D. In light

Answer: (B)

Dimensional stability for elastomeric impressions relies on keeping the environmental conditions steady after removal from the mouth. If the material is exposed to heat, the continued reactions or thermal fluctuations can cause distortion, leading to shrinkage or warping. If it’s left in air or in a moist environment, the impression can exchange moisture or solvents, resulting in volume changes that alter accuracy. Storing the impression in a sealed container away from heat and moisture protects it from these fluctuations—moisture exchange is minimized and temperature stays stable—so the impression remains dimensionally stable until it’s poured.