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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Long-Term Effects of Medical Implants
SJR: 0.133 SNIP: 0.491 CiteScore™: 0.89

ISSN Печать: 1050-6934
ISSN Онлайн: 1940-4379

Выпуски:
Том 29, 2019 Том 28, 2018 Том 27, 2017 Том 26, 2016 Том 25, 2015 Том 24, 2014 Том 23, 2013 Том 22, 2012 Том 21, 2011 Том 20, 2010 Том 19, 2009 Том 18, 2008 Том 17, 2007 Том 16, 2006 Том 15, 2005 Том 14, 2004 Том 13, 2003 Том 12, 2002 Том 11, 2001 Том 10, 2000

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2019030866
pages 79-86

The Effect of Mandibular Flexure on Stress Distribution in the All-on-4 Treated Edentulous Mandible: A Comparative Finite-Element Study Based on Mechanostat Theory

Shayan Shahriari
Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Azim Parandakh
Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
Mohammad-Mehdi Khani
Medical Nanotechnology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Nima Azadikhah
Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Paniz Naraghi
Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mahsa Aeinevand
Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mohammad Nikkhoo
Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Arash Khojasteh
Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Краткое описание

The All-on-4 treatment concept is a felicitous approach for treatment of edentulous mandible. Mandibular flexure plays a decisive role in several restorative failures−for instance, screw loosening, particularly in widely separated implant supports such as those utilized in All-on-4 treatment methods. We investigated the effect of mandibular flexure on stress distribution and likelihood of bone loss or growth in the implanted mandible using two frequently used All-on-4 methods of implantation: parallel and tilted. Three-dimensional finite-element models of mandible and dental implants together with their compartments were developed. Assuming sagittal symmetry for the mandible, only half of the full geometry was considered. In the parallel model, two dental implants were inserted into the mandible perpendicular to the occlusal plane. In the tilted model, the posterior implant was rotated 30° around the buccal-lingual axis. In both models, maximum stress was detected at the neck region of the posterior implant. This maximum stress was greater in the tilted model than in the parallel model. However, since the corresponding strain was considerably lower in the parallel model, according to mechanostat theory several elements in the parallel model were at risk of bone loss. In contrast, the greater strain in the tilted model decreased the likelihood of bone loss. These findings suggest that use of tilted implants in the treatment of edentulous mandible would reduce the probability of bone loss in vulnerable parts of the osseous tissue surrounding dental implants.

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