Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 6 4 2009 12 15 206 208 A. Monzavi Associate Professor, Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran G. Asadi Assistant Professor, Department of Prosthodontics and Implant, School of Dentistry, Tehran Universit 2015 10 03 Making impression to obtain an accurate working cast needs to use accurate impression materials such as polyether. On the other hand, polyether cannot be used easily in places with undercut such as excessive interproximal spaces and under the pontics of fixed partial dentures as it may be locked in these free spaces. In this article, a method is presented to blockout interproximal spaces in order to minimize distortion and to facilitate impression removal from the mouth. https://fid.tums.ac.ir/index.php/fid/article/view/201 https://fid.tums.ac.ir/index.php/fid/article/download/201/201