<b>Dimensional accuracy of Polyether Elastomeric Impression materials after using Chitosan as a disinfectant: A Sustainable Approach to Dental Infection Control</b>
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<b>Background:</b> with the growing demand for sustainable dental practices, chitosan has evolved as an eco-friendly disinfectant for polyether impressions.<b>Purpose: </b>The present study investigated the disinfectant efficacy of chitosan on the dimensional accuracy of polyether (PE) impression material.<b>Materials and methods:</b> sixty-three polyether impressions (ImpregumTM, PentaTM, 3M ESPE, USA) were prepared from the master 3D- printed model, each consisted of a single unit abutment facing two units’ abutments. Three groups of these subjects were used, while each group was comprised of 21 impressions respectively. <b>Group 1</b> is used as a control group and not subjected to chemical disinfection. <b>Group 2</b> is spraying group, in which the PE impressions were sprayed with 0.5% Chitosan with high molecular weight. <b>Group 3</b> is the immersion group, in which the impression was immersed for 15 minutes in 0.5% chitosan with high molecular weight. Data collected was analyzed using SPSS 28.0 and the difference in dimensional accuracy between the groups was measured using one-way ANOVA.<b>Results:</b> Both Intra-and Inter- abutment measurements (MD and OG) showed no statistically significant difference in the dimensional changes between the control and the study groups. While the cross-arch distance showed statistically significant difference in the dimensional change between control and immersion group. P=0.000<b>Conclusion:</b> While chitosan disinfection induced slight dimensional changes in polyether impressions, these alterations remained within clinically acceptable limits. The spray application method appeared to be more preferable to immersion, as it resulted in less pronounced dimensional changes.
**背景：** 随着牙科诊疗可持续化实践需求的日益增长，壳聚糖（chitosan）已逐步发展为聚醚（polyether, PE）印模的环保型消毒剂。**目的：** 本研究旨在探讨壳聚糖对聚醚印模材料尺寸精度的消毒效果。**材料与方法：** 从3D打印主模型上制取63个聚醚印模（Impregum™、Penta™，3M ESPE，美国），每个印模均包含1个单单位基台与2个相对设置的双单位基台。将样本分为3组，每组各21个印模。**第1组**为对照组，不进行化学消毒处理；**第2组**为喷雾组，采用0.5%高分子量壳聚糖对聚醚印模进行喷雾消毒；**第3组**为浸泡组，将印模置于0.5%高分子量壳聚糖溶液中浸泡15分钟。采用SPSS 28.0软件对采集的数据进行分析，通过单因素方差分析（one-way ANOVA）比较各组间的尺寸精度差异。**结果：** 基台内部与基台间的测量指标（MD与OG）显示，对照组与各实验组的尺寸变化均无统计学显著性差异。而跨弓距离的测量结果显示，对照组与浸泡组的尺寸变化存在统计学显著性差异（P=0.000）。**结论：** 尽管壳聚糖消毒会使聚醚印模产生轻微的尺寸变化，但该改变仍处于临床可接受范围内。喷雾式消毒法相较于浸泡法更为可取，因其引发的尺寸改变程度更为轻微。
