Saleh Saber Fariba, Abolfazli Nader, Kohsoltani Maryam
Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Science, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2010 Fall;4(4):124-9. doi: 10.5681/joddd.2010.031. Epub 2010 Dec 21.
The condensation silicone impression materials are available, but there is little knowledge of their accuracy after disinfection. The objective of this study was to evaluate the effect of the disinfection by spray atomization on dimensional accuracy of condensation silicone impressions.
Impressions were made on a stainless steel master model containing a simulated two complete crown preparation with an edentulous space interposed using Spidex® and Rapid® impression materials. 44 impressions were made with each material, of which 16 were disinfected with 5.25% sodium hypochlorite, 16 were disinfected with 10% iodophor and 12 were not disinfected. Three dimensional measurements of working casts, including interpreparation distance, height, and diameter, were calculated using a measuring microscope graduated at 0.001 mm. Dimensional changes (mm) between the disinfected and non-disinfected working casts were compared. One-way analysis of variance (ANOVA) was employed to analyze the data (α=0.05).
Disinfection of each condensation silicone material by spraying atomization with two different disinfectant material resulted in significant change in interpreparation distance (p<0.05). Changes in height and diameter were only significant in Spidex® impressions (p<0.05).
Significant changes in the mean dimensions were seen as a result of disinfection by spraying; however, the dimensional changes do not seem great enough to cause critical positional distortion of teeth when fixed partial denture restorations are made.
缩合型硅橡胶印模材料已广泛应用，但对于其消毒后的准确性了解甚少。本研究的目的是评估喷雾雾化消毒对缩合型硅橡胶印模尺寸精度的影响。
在一个不锈钢主模型上制作印模，该模型包含两个模拟全冠预备体，中间有一无牙间隙，使用Spidex®和Rapid®印模材料。每种材料制作44个印模，其中16个用5.25%次氯酸钠消毒，16个用10%碘伏消毒，12个未消毒。使用分度为0.001mm的测量显微镜计算工作模型的三维测量值，包括预备体间距离、高度和直径。比较消毒和未消毒工作模型之间的尺寸变化（mm）。采用单因素方差分析（ANOVA）分析数据（α=0.05）。
用两种不同消毒剂对每种缩合型硅橡胶材料进行喷雾雾化消毒后，预备体间距离有显著变化（p<0.05）。高度和直径的变化仅在Spidex®印模中显著（p<0.05）。
喷雾消毒导致平均尺寸有显著变化；然而，当制作固定局部义齿修复体时，尺寸变化似乎不足以引起牙齿严重的位置变形。
