Effect of Disinfecting Solutions for AIDS, ATL and HB Virus on Surface Conditions of Die Models

在牙科诊所，病毒感染如艾滋病、ATL和B型肝炎的风险一直是一个重要的问题。将牙印模浸入各种消毒溶液中已被证明是一种有效的病毒感染消毒方法。本研究比较了三种消毒液对硅橡胶印模材料（Tosicon Injection，Hydrophilic Exaflex Injection Type）、琼脂印模材料（Dentoloid Pink）和藻酸盐印模材料（Aroma Fine Dust Free Normal Set）的消毒效果。将印模分别浸泡在2%戊二醛、10%聚维酮碘和70%乙醇中30分钟。对模具的表面粗糙度、表面硬度、尺寸变化及与铸件的适应性进行了测试。2%戊二醛、10%聚维酮碘和70%乙醇浸泡对模具表面粗糙度无影响.对于硅橡胶印模材料，10%聚维酮碘和70%乙醇浸泡后，印模表面硬度略有下降.琼脂和藻酸盐印模材料制作的印模模型在70%乙醇中浸泡后易发生尺寸变化. I类嵌体和2类嵌体的骨水泥层厚度非常薄。消毒液浸泡印模法制备的印模精度可满足临床要求. 2%戊二醛溶液浸泡印模30分钟对硅橡胶印模材料制作的模型是非常合适的。

In dental offices, the risk of viral infections such as AIDS, ATL and hepatitis B has been an important problem. Immersion of dental impressions in various disinfecting solutions has been shown to be an effective disinfection procedure for viral infection. The effects of immersing impression materials in three disinfecting solutions were compared in this study.Two silicone impression materials(Tosicon Injection, Hydrophilic Exaflex Injection Type), one agar impression material(Dentoloid Pink)and one alginate impression material(Aroma Fine Dust Free Normal Set)were used. These impressions were immersed in 2% glutaraldehyde, 10% povidone iodine and 70% ethanol for 30 minutes respectively. The die models were assayed for its surface roughness, surface hardness, dimensional changes and adaptation of castings.The main results were as follows :1. The surface roughness of die models was not affected by immersing in 2% glutaraldehyde, 10% povidone iodine and 70% ethanol.2. In the case of silicone impression materials, the surface hardness of die models slightly decreased by immersing 10% povidone iodine and 70% ethanol.3. The dimentional changes of die models made from agar and alginate impression materials were often brought about by immersing in 70% ethanol.4. The thickness of the cement layers of Class I inlays and Class 2 inlays were excellently thin. The precision of the casting prepared by means of immersion of impressions in disinfecting solutions could satisfy the clinical requirements.5. Immersion of impressions in 2% glutaraldehyde solution for 30 minutes was found highly suitable for the models made from silicone impression materials.