TODENTJ-25-03-2019_TODENTJ-9-87 1553505635 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 2 10 2015 9 1 Mahmoud Sabouhi Saied Nosouhian Mansour Dakhilalian Amin Davoudi Ramin Mehrad Introduction : Post and core are needed to regain retentions and functions after endodontic therapies. Also, risk of cross contamination from dental prosthesis is so high. The aim of this study was to compare dimensional changes of acrylic resin patterns (ARP) in three different storing environments. Materials and methods : conventional root canal therapy was done on one first premolar tooth and the canal filled with Guttapercha. 2/3 of the filling was expelled and 30 direct APRs were prepared by Duralay. The samples were divided into 3 groups based on storing environments: water, NaOCl 5% and air. Finally dimensional changes in coronoapical length (CAL), coronal (CD) and apical diameter (AD) of APRs were measured in 7 consecutive times (immediately after polymerization, 1, 2, 4, 8, 24, 48 hours later). All the data were analyzed by Paired T-test and Duncon test using SPSS software ver.13 at significant level of 0.05. Results : After 24 hours, the ARPs, which were stored in air, contracted 0.07, 0.06 and 0.12 mm in AD, CD and CAL; the ARPs, which were stored in water, showed 0.03, 0.06 and 0.12 mm decrease in AD, CD and CAL; But the ARPs, which were stored in NaOCl 5%, showed significant expansion in AD, CD and CAL (0.03, 0.06 and 0.10 mm) (all P values < 0.01). Conclusion : It is better not to use NaOCl for disinfecting; also the best time for storing APRs is 8 hours for water and 2 hours for air environments after setting time. 2 10 2015 87 90 TODENTJ-9-87 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2014-11-10 2014-12-10 2014-12-14 2015-2-10 http://creativecommons.org/licenses/by-nc/3.0/ 10.2174/1874210601509010087 1553505635 https://opendentistryjournal.com/VOLUME/9/PAGE/87/ https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-87/TODENTJ-9-87.xml Anusavice K, Ed. 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