Dental Which of the following is the least preferred method for increasing the working time of ZnPO4 cement? A The P/L ratio can be reduced to produce a thinner mixture B Smaller portions of powder should be mixed for the first few increments C The operator can prolong the spatulation of the last increment of powder D Colder mixing temperature (though temperature of mixing slab should be above dew point) 💡 Explanation Which of the following is the least preferred method for increasing the working time of ZnPO4 cement? ✓ Correct Answer: C. The operator can prolong the spatulation of the last increment of powder