3种方式调拌Jeltrate藻酸盐印模材料的气泡含量及物理性能比较

目的：评价全自动印模调拌机、半自动印模调拌机、手动调拌3种调拌方法调拌藻酸盐印模材料的气泡含量及物理性能。方法在同种条件下（室温、水粉比、蒸馏水温度），分别采用全自动印模调拌机调拌法、半自动印模调拌机调拌法、手动调拌法调制藻酸盐印模材料。比较各调拌方法所调制材料的气泡数量、气泡总面积、压应变值、弹性回复值、流动性。结果3种调拌方法的气泡量和气泡面积之间差异有统计学意义。全自动调拌机调拌的材料气泡最少，半自动调拌机调拌的材料次之，手动调拌的材料气泡最多。3种调拌方法调拌的材料物理性能均符合国家相关标准，手工调拌法的弹性回复值低于半自动调拌法及全自动调拌法，全自动调拌法印模流动性最好。结论在本实验条件下，藻酸盐印模材料调拌方法对材料气泡含量及其物理性能有影响；不同调拌方法所调材料物理性能均符合国家相关标准，全自动调拌法所调材料性能最佳。

Effects of mixing methods on the porosity and mechanical properties of three different alginate impression materials

Objective To evaluate the air bubble formation and mechanical properties of alginate impression material mixed manually, by a fully automatic mixing machine, and by a semi-automatic mixing machine. Methods Alginate impression materials were mixed by three different methods under the same conditions(room temperature, water/powder ratio, and distilled water temperature). The number and area of air bubbles, compression strain, elastic recovery, and rheological property were evaluated. Results The number and area of air bubbles were statistically different between the materials mixed by three different methods. Material sections from the manual group had the most air bubbles, whereas material sections from the fully automatic group had the least. The manual group had lower elastic recovery compared with the fully automatic and semi-automatic groups. The impression materials were mixed by different methods according to national criteria. The fully automatic group had the best rheological property. Conclusion Mixing methods affected the air bubble content and mechanical properties of alginate material. The mechanical properties of the material mixed by different methods were eligible for clinical use in accordance with national criteria. The alginate mixed with the fully automatic machine showed the best performance.