Objective Explore the influence of water temperature variations on the flowability,working time,setting time,and deformation of alginate impression materials.Methods Four different water temperatures were used to mix alginate with a full-automatic impression mixing machine,grouped according to different water temperatures(8 ℃,14 ℃,23 ℃ and 32 ℃),and the work-ing time and setting time were observed and measured by comparing the flowability of alginate impression materials on the glass plate;a mold kit was used to prepare the impression and observe its deformation.The data was statisically analyze using the SPSS 24.0 soft-ware package and compare the differences between the groups.Results The flowability of the alginate impression materials prepared by the four different water temperature was in order of 8 ℃ group＞14 ℃ group＞23 ℃ group＞32 ℃ group,and the difference between groups was statistically significant(P＜0.05).The working time and the setting time in descending order was 32 ℃ group＜23 ℃ group＜14 ℃ group＜8 ℃ group,and the difference between different groups was statistically significant(P＜0.05).The working time of(29.3±1.0)s and setting time of(41.0±1.4)s in the 32 ℃ group,as well as the setting time of(133.2±3.8)s in 8 ℃ group,did not meet the requirements for clinical application.There was a differences in deformation between the groups,but it was not statistically significant(P＞0.05).Conclusion Within a certain range,the water temperature has a negative correlation with the fluidity,working time and setting time of alginate impression materials.A water temperature of 14～25 ℃ is suitable for clinical use.
维普
万方数据