Azevedo Maria João, Correia Inês, Portela Ana, Sampaio-Maia Benedita
Faculty of Dental Medicine, Universidade do Porto, Porto, Portugal.
National Institute of Biomedical Engineering, Universidade do Porto, Porto, Portugal.
J Adv Prosthodont. 2019 Jun;11(3):155-161. doi: 10.4047/jap.2019.11.3.155. Epub 2019 Jun 26.
Although dental impression disinfection is determinant to reduce the cross-infection risk, some studies have shown that, in real practice, the disinfection procedures vary considerably. Thus, the aim of this study was to evaluate the antimicrobial effectiveness and the impact on the dimensional stability of addition silicone' impressions of water wash and the most clinically used disinfection solutions: 3% hydrogen peroxide, commercial disinfectant MD520 (Durr) and 1% and 5.25% sodium hypochlorite.
For this investigation, dental impressions were taken on 16 volunteer dental students. The antimicrobial effectiveness of each procedure was evaluated by pour plate method. The dimensional stability was evaluated using a standardized stainless-steel model, according to ANSI/ADA nº19 specification.
The study results showed that water wash does not alter the dimensional stability of addition silicone impressions but doesn't reduce the microbial load of the material (>.05). On the other hand, addition silicone disinfection by immersion with 3% hydrogen peroxide, MD520 (Durr), or sodium hypochlorite at 1% and 5.25% does not alter the dimensional stability significantly but reduces > 99.9% of the microbial load of the impressions (<.001).
Addition silicone impressions should always be disinfected after water wash in order to reduce effectively the cross-infection risk. All disinfectants tested showed high antimicrobial efficiency without significant changes in three-dimensional shape of impressions. Hydrogen peroxide and sodium hypochlorite are of particular importance because are easily accessible in dental setting. The less explored hydrogen peroxide could be a valuable alternative for silicone impressions disinfection.
尽管牙科印模消毒对于降低交叉感染风险至关重要，但一些研究表明，在实际操作中，消毒程序差异很大。因此，本研究的目的是评估水洗以及临床上最常用的消毒溶液（3%过氧化氢、商用消毒剂MD520（杜尔）以及1%和5.25%的次氯酸钠）对加成型硅橡胶印模的抗菌效果及其对尺寸稳定性的影响。
在16名牙科专业志愿者学生身上制取牙科印模用于本次研究。通过倾注平板法评估每种消毒程序的抗菌效果。根据ANSI/ADA第19号规范，使用标准化不锈钢模型评估尺寸稳定性。
研究结果表明，水洗不会改变加成型硅橡胶印模的尺寸稳定性，但不会降低材料的微生物负荷（P>0.05）。另一方面，用3%过氧化氢、MD520（杜尔）或1%和5.25%的次氯酸钠浸泡消毒加成型硅橡胶印模，不会显著改变尺寸稳定性，但可降低印模>99.9%的微生物负荷（P<0.001）。
为有效降低交叉感染风险，加成型硅橡胶印模水洗后应始终进行消毒。所有测试的消毒剂均显示出高抗菌效率，且印模的三维形状无显著变化。过氧化氢和次氯酸钠尤为重要，因为在牙科环境中容易获取。较少被研究的过氧化氢可能是硅橡胶印模消毒的一种有价值的替代方法。
