What causes porosity in a denture base?

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Packing during the dough phasePolymerizing at 160°F for 9 hoursApplying insufficient pressureAll of the above factors

Explanation

Porosity in denture bases can result from multiple factors including packing at the dough stage, curing at 160°F for 9 hours, and inadequate pressure. Therefore, all these contribute to the formation of porosity.