戊二醛消毒液对4种高分子印模尺寸变化的影响

目的:比较Impregum聚醚橡胶印模、Express硅橡胶印模和Silagum硅橡胶印模以及GC EXAFINE硅橡胶印模用20ml/L碱性戊二醛处理不同时间后对模型精度的影响。方法:用这4种印模材料各制取15个同一金属实验模具的石膏模型,每种模型材料分为3组:一组用清水冲洗作对照组,其余2组用20ml/L碱性戊二醛浸泡20、40min后用超硬石膏灌模,静置24h后用测量显微镜测量金属模型和石膏模型上各标志点的距离,精度为0.001mm,所得数据进行统计分析。结果:Express硅橡胶印模材料制取的石膏模型线性变化率在浸泡20min时均为正值且比主模型稍大。4种印模材料印模在浸泡40min后灌注的石膏模型和金属模型相比有显著性差异。结论:在这4种印模材料中,浸泡20min时,Express硅橡胶印模材料的印模精度最高。

The effect of glutaraldehyde disinfectant on the dimension stability of four high polymer impression materials

Objective:To measure the effect of disinfection on dimension stability of four high polymer impression materials which were separately immersed in 20 ml/L glutaraldehyde solution.Methods:Fifteen plaster replication models of four high polymer impression materials(Impregum Penta polyether, Express-Putty silicone, Silagum-Putty silicone, GC EXAFINE silicone) were made on the same metal master cast respectively. Vertical and horizontal dimensions between landmarks on the masters and plaster casts were measured with an optical microscope,one-way ANOVA was used to compare the measurements among the materials.Results:The difference between the masters and Casts in horizontal distances measured on Express-Putty silicone impression material produced models was longer than those on other high polymer impression materials produced ones after disinfection for 20 minutes and beyond clinical requirement. Compared with metal master cast, the difference became significant when these four silicone impression materials were disinfected for 40 minutes. Conclusion: Among the four kinds of impression materials, the Express-Putty silicone material is relatively the most accurate one after disinfection for 20 minutes.