浸泡消毒对海藻酸盐印模三维尺寸稳定性影响的评价

目的评价海藻酸盐印模分别接受2%酸性戊二醛、2%碱性戊二醛、2%强化中性戊二醛、84消毒液(有效氯含量为0.3%)的30分钟浸泡消毒处理后的三维尺寸稳定性的变化。方法采用同一个标准模型制取印模。实验分为四个消毒处理组,不处理组作为对照组。采用三维坐标扫描机分析消毒处理后的印模灌制出模型的尺寸改变,精确度可达0.001mm。结果除了2%强化酸性戊二醛处理组各项指标均与对照组没有显著性差异以外(P>0.05),其余三个消毒处理组均在水平向、垂直向和角度等方面与对照组出现显著性差异(P<0.05)。结论2%酸性戊二醛浸泡消毒30分钟,对海藻酸盐印模的三维尺寸稳定性没有显著性影响。

Evaluation of the three-dimensional stability of alginate impression materials after immersion disinfection

Objective To evaluate the effect of immersion disinfection on the three-dimensional stability of alginate impression materials after 30 minutes immersion in different disinfection solusions of 2% neutral glutaraldehyde, 2% acid glutaraldehyde, 2% alkaline glutaraldehyde solutions, and sodium hypochlorite ( 0.3% available chlorine), respectively.Methods Impressions were made from the master model with irreversible hydrocolloid (Heraeus Kulzer's Alginoplast) impression material. In 4 treatment groups, the disinfected samples were immersed for 30 minutes with the four disinfectants, respectively. Impressions with no immersion were served as the controls. A computerized contact-measuring device was used to measure the three-dimensions of the stone casts poured against the treated impressions. The device was capable of producing 0.001 mm reading precision.Results Statistical evaluation of measurements of the casts showed significant differences (P< 0.05) in the 2% neutral glutaraldehyde, in the 2% alkaline glutaraldehyde, and in the sodium hypochlorite group compared to the control group. The difference was not found in the 2% acid glutaraldehyde group (P> 0.05).Conclusion Treating irreversible hydrocolloid impressions with 2% acid glutaraldehyde solution for 30 minutes did not cause statistically significant three-dimensional changes in the tested alginate impression materials.