en Oral medicine Oral medicine Original article Original article <table align="center" cellpadding="0" cellspacing="0" hspace="0" vspace="0"> <tbody> <tr> <td align="left"><strong>Background and Aim</strong><strong>:</strong> &nbsp;The purpose of this study was to compare dentinal tubular penetration of two root canal sealers namely AH26 and MTA Fillapex in single-rooted teeth by scanning electron<br> microscopy.<br> <strong>Materials and Methods:</strong> &nbsp;Thirty-five mature human single-rooted teeth were selected. Cleaning and shaping was performed. The teeth were randomly divided into 2 groups. AH26 was delivered into the canals in group 1, and MTA Fillapex was delivered into the root<br> canals in group 2 by lateral compaction technique. The roots were sectioned at 3 mm and 5 mm from the apex. The sections were evaluated by scanning electron microscopy, and the deepest<br> penetration depth of sealers was recorded. Statistical analysis was performed by t-test using SPSS version 19.0.<br> <strong>Results:</strong> &nbsp;&nbsp;The deepest tubular penetration in group 1 at 3 mm from the apex was 808 &micro;m while it was 717 &micro;m in group 2 at 3 mm from the apex. The difference between the two groups was not significant (P=0.4). At 5 mm from the apex, the deepest tubular infiltration in group 1 was 995 &micro;m while it was 915 &micro;m in group 2. The difference between the 2 groups was not significant (P=0.4).</td> </tr> </tbody> </table> <div style="clear:both;"></div><strong>Conclusion:</strong> &nbsp;&nbsp;Both sealers can be predictively used in different<br> clinical situations when indicated . Root Canal Preparation, Microscopy, Electron, Scanning, Root Canal Therapy 15 21 http://jrdms.dentaliau.ac.ir/browse.php?a_code=A-10-352-2&slc_lang=en&sid=1 A Delvarani adelvarani@yahoo.com 10031947532846009684 10031947532846009684 No Endodontics Department, Membership of Dental Material Research Center, Faculty of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran F Arzhangi arzhangifatima@gmail.com 10031947532846009685 10031947532846009685 No Dental student, Faculty of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran. M Mohamadi ddsmehdimohamadi@yahoo.com 10031947532846009686 10031947532846009686 No Endodontics Department, Faculty of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran S Toursavadkouhi s_savadkouhi@yahoo.com 10031947532846009687 10031947532846009687 Yes Endodontics Dept, Member ship of Dental Material Research Center, Faculty of Dentistry, Tehran Medical Sciences,Islamic Azad University, Tehran, Iran