AU - Zarbakhsh, A AU - Mazaheri Tehrani, A AU - Shamshirgar, F AU - Khosroshahi, H TI - Effect of GapSealĀ® as a Sealing Material on Microgap and Microleakage at External Hexagon Implant Connections Following Cyclic Loading: An In Vitro Study PT - JOURNAL ARTICLE TA - J-Res-Dent-Maxillofac-Sci JN - J-Res-Dent-Maxillofac-Sci VO - 3 VI - 3 IP - 3 4099 - http://jrdms.dentaliau.ac.ir/article-1-216-en.html 4100 - http://jrdms.dentaliau.ac.ir/article-1-216-en.pdf SO - J-Res-Dent-Maxillofac-Sci 3 ABĀ  - Background and Aim: The mismatch of the implant-abutment connection can produce instant stress and microleakage which result in mechanical and biological complications. This study aimed to investigate the influence of GapSeal® as a sealing material on the extent of microgap and microleakage at the external hexagon implant platform following cyclic loading. Materials and Methods: Sixteen implants with an external-hexagon connection (BioHorizons External dental implant) were employed in this in-vitro experimental study. All implant-abutment sets were assigned to two groups and were molded in acrylic resins. GapSeal® was injected into the implants in the experimental (test) group. Then, implant assemblies were tightened with the torque of 30 N/cm, and 1200,000 loading cycles with the force of 100 N and the frequency of 1 Hz were applied. Every sample was immersed in a methylene blue dye to evaluate microleakage. Microgap was measured in six regions randomly using a scanning electron microscope (SEM). The data were entered into SPSS 22 and were analyzed using t-test. Results: The mean±SD microgap was 0.87±0.35 µm and 3.43±1.61 µm in the test and control groups, respectively. Methylene blue dye was observed in all of the specimens of the control group, while no liquid was seen in the test group. A significant statistical difference was found between the groups regarding the microgap and microleakage (P<0.0001). Conclusion: Application of GapSeal® reduced the dimension of the microgap and decreased microleakage at the implant-abutment interface. CP - IRAN IN - Tehran Medical Sciences, Islamic Azad University, Tehran, Iran. LG - eng PB - J-Res-Dent-Maxillofac-Sci PG - 42 PT - Original article YR - 2018