Porosity measurements in four types of hand-mixed  cements  showed  that __________  cement had the highest porosity.
Porosity measurements in four types of hand-mixed cements showed that polycarboxylate cement had the highest porosity and resin cement had the least. Zinc phosphate and GICs had intermediate amounts of porosity.
Ref: Phillip’s Science of Dental Materials ed 12 pg 320
Resin cement
GIC
Zinc phosphate cement
Polycarboxylate cement