How can the dimensional stability of hydrocolloid impressions be maintained effectively?

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Reducing the water-to-powder proportionKeeping the impression submerged in waterExtending the working timeStoring the impression in a humidorApplying heat during setting

Explanation

Dimensional stability of hydrocolloid impressions is best preserved by storing them in a humid environment, such as a humidor, which prevents shrinkage or distortion. Other methods like altering water-powder ratios, immersing in water, or prolonging manipulation do not effectively maintain the impression's dimensions.