Thota Kiran Kumar, Jasthi Sujana, Ravuri Rajyalakshmi, Tella Suchita
Reader, Department of Prosthodontics, Kamineni Institute of Dental Sciences, Sreepuram , Narketpally, Nalgonda, Telangana, India .
Post Graduate Student, Department of Prosthodontics, Kamineni Institute of Dental Sciences, Sreepuram , Narketpally, Nalgonda, Telangana, India .
J Clin Diagn Res. 2014 Oct;8(10):ZC48-50. doi: 10.7860/JCDR/2014/9768.5036. Epub 2014 Oct 20.
The purpose of the study was to determine the effect of autoclaving on the dimensional stability of three different elastomeric impression materials at three different time intervals.
Standardized stainless steel master die as per ADA specification number 19 was fabricated. The impression materials used for the study were condensation silicone (GP1), addition silicone (GP2) and polyether (GP3). A total of 45 samples of the stainless steel die were made (n = 45), that is 15 samples for each group. Impression materials were mixed according to the manufacturer's instructions and were loaded into the mold to make an impression of the die. Impressions were identified with the help of numerical coding system and measurements were made using stereomicroscope (MAGNUS MSZ-Bi) of 0.65x magnification with the help of image analysis software (IMACE PRO-INSIGHT VERSION.The results were subjected to statistical analysis using one way analysis of variance and student t-test for comparison between the groups.
Within the limitations of the study statistically significant dimensional changes were observed for all the three impression materials at three different time intervals but this change was not clinically significant.
It is well-known fact that all impressions should be disinfected to avoid possible transmission of infectious diseases either by direct contact or cross contamination. Immersion and spray disinfection as well as various disinfection solutions have been tested and proven to be effective for this purpose. But for elastomeric impression materials these methods have proven to be ineffective as they do not prevent cross contamination among the dental team. So autoclaving was one of the most effective sterilization procedure for condensation silicone and addition silicone. Since polyether is hydrophilic it is better to disinfect the impressions as recommended by the manufacturer or by immersion or spray atomization.
本研究的目的是确定在三个不同时间间隔下，高压灭菌对三种不同弹性印模材料尺寸稳定性的影响。
按照ADA规范第19号制作标准化不锈钢主模型。本研究使用的印模材料为缩合型硅橡胶（GP1）、加成型硅橡胶（GP2）和聚醚橡胶（GP3）。共制作了45个不锈钢模型样本（n = 45），即每组15个样本。印模材料按照制造商的说明进行混合，并装入模具中制作模型的印模。通过数字编码系统对印模进行识别，并借助图像分析软件（IMACE PRO-INSIGHT VERSION），使用放大倍数为0.65倍的体视显微镜（MAGNUS MSZ-Bi）进行测量。结果采用单因素方差分析和学生t检验进行统计学分析，以比较各组之间的差异。
在本研究的局限性范围内，在三个不同时间间隔下，观察到所有三种印模材料均有统计学上显著的尺寸变化，但这种变化在临床上并不显著。
众所周知，所有印模都应进行消毒，以避免通过直接接触或交叉污染可能传播的传染病。浸泡和喷雾消毒以及各种消毒溶液已经过测试并被证明对此有效。但对于弹性印模材料，这些方法已被证明是无效的，因为它们不能防止牙科团队之间的交叉污染。因此，高压灭菌是缩合型硅橡胶和加成型硅橡胶最有效的灭菌程序之一。由于聚醚橡胶具有亲水性，最好按照制造商的建议或通过浸泡或喷雾雾化对印模进行消毒。
