<prompt> Which of the following techniques can extend the working time of a zinc phosphate cement?The PL ratio can be reduced to produce a thinner mixtureSmaller portions of powder should be mixed for the first few incrementsColder mixing temperature though temperature of mixing slab should be above dew pointAll of the above  <response>: Control of Setting Time:Manufacturing processSintering temperature: Higher the temperature, the more slowly the cement sets.Particle size: Finer particles react more quickly as a greater surface area is exposed to the liquid.Water content of liquid: Presence of excess water accelerates, whereas insufficient water retards the reaction.Buffering agents: When added, slows down the reaction.Factors under control of operatorTemperature: Higher temperatures accelerate the reaction. Cooling the mixing slab is an effective way of slowing the reaction and prolonging the working time.Powder-liquid ratio: More the liquid, slower the reaction. Rate of addition of powder to liquid: The reaction is slower, if the powder is incorporated slowly.Mixing time: Longer the mixing time within practical limits, the slower is the rate of reaction.Ref: Manappalil P: 90 