3种调拌方法对藻酸盐印模材料气泡及凝固状态的影响

Effect of three mixing methods on air bubbles and solidification state of alginate impression materials

目的 :比较全自动印模调拌机、顺时针手动和联合八字手动3种调拌方法对藻酸盐印模材料气泡含量、流动性等物理性能的影响。方法:分别采用3种不同调拌方法调制藻酸盐印模材料,比较印模的气泡数量、总面积和流动性,调拌前、后温度变化以及工作时间和凝固时间差异。采用SPSS 24.0软件包对数据进行统计学分析。结果:全自动调拌组气泡数量为(2.30±2.50)个,总面积为(0.17±0.18) mm2,小于顺时针手动调拌组数量[(59.60±14.19)个]和总面积[(7.41±2.24) mm2],差异有统计学意义(P<0.01);顺时针手动调拌组流动性(39.52±0.85) mm,小于全自动调拌组[(50.78±0.90) mm]和联合八字手动调拌组[(50.36±1.75) mm],差异有统计学意义(P<0.01);3种方法调印模的工作时间和凝固时间均符合临床要求。结论:全自动调拌法印模在气泡含量、流动性等方面较佳。手动调拌中,联合八字调拌法有助于减少印模气泡与形变量,提高流动性。

PURPOSE: To evaluate the effect of full-automatic mixing machine method, clockwise manual mixing and combined eight-shaped manual mixing on air bubble content, flowability, temperature, working time and setting time of alginate impression materials. METHODS: With the same condition, alginate impression materials were mixed by three different methods. The number of bubbles, area, flowability, temperature, working time and setting time were evaluated with SPSS 24.0 software package. RESULTS: The number of bubbles in the automatic mixing group was(2.30±2.50), and the area was(0.17±0.18) mm2, which was less than the number of clockwise manual mixing group(59.60 ±14.19), and the total area(7.41±2.24) mm2(P<0.01). The flowability of the clockwise manual mixing group [(39.52±0.85) mm] was less than that of the full-automatic mixing group [(50.78 ±0.90) mm] and the combined eight-character manual mixing group[(50.36±1.75) mm](P<0.01).The setting time of the material mixed by three methods was eligible for clinical use. CONCLUSIONS: The mixing method of alginate impression material has an effect on material’s bubble content, flowability and temperature changes. The impression materials mixed by full-automatic mixing method are better in terms of bubble content, flowability and other properties. If manual mixing is used, combined eight-shaped manual mixing method can help reduce impression bubbles and deformation, and improve flowability.