Kendzior G M, Leinfelder K F, Hershey H G
Angle Orthod. 1976 Oct;46(4):345-50. doi: 10.1043/0003-3219(1976)046<0345:TEOCTM>2.0.CO;2.
A series of proprietary zinc phosphate cements were evaluated after mixing on glass slabs at three different temperatures, 23 degrees, 6 degrees and -10 degrees C. Working time, setting time, diametral tensile strength, compressive strength and solubility were investigated. From the results of the tests the following conclusions were made: 1) As the temperature of the mixing slab was decreased, the amount of powder required to maintain a constatnt viscosity increased. 2) Compressive, tensile, and solubility values remained constant as the temperature of the mixing slab was decreased provided a consistent viscosity was maintained. 3) Mixing zinc phosphate cement substantially below the dew point is an acceptable practice provided the powder/liquid ratio is modified accordingly. 4) Although the setting time of zinc phosphate cement generally remained constant at temperatures below 6 degrees C, the working time continued to increase at -10 degrees C. 5) Mixing zinc phosphate cemment on a cold mixing slab increases the working time on the glass slab and decreases the setting time in an oral environment. Both of these alterations are clinically beneficial to the orthodontist.
对一系列专利磷酸锌水门汀在三种不同温度（23摄氏度、6摄氏度和零下10摄氏度）的玻璃板上混合后进行了评估。研究了工作时间、凝固时间、径向拉伸强度、抗压强度和溶解度。根据测试结果得出以下结论：1）随着混合板温度降低，为保持恒定粘度所需的粉末量增加。2）如果保持一致的粘度，随着混合板温度降低，抗压、拉伸和溶解度值保持恒定。3）只要相应调整粉液比，在大大低于露点的温度下混合磷酸锌水门汀是一种可接受的做法。4）尽管磷酸锌水门汀的凝固时间在6摄氏度以下的温度通常保持恒定，但在零下10摄氏度时工作时间继续增加。5）在冷的混合板上混合磷酸锌水门汀会增加在玻璃板上的工作时间，并缩短在口腔环境中的凝固时间。这两种变化对正畸医生在临床上都有益。
