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The 3D mandible model with a symphyseal fracture, teeth, periodontal ligament, and fixation devices were created for the FE analyzes. The bone structure was determined as a transverse isotropic whereas the fixation devices were titanium. The load includes Masseter, Medial Pterygoid, and Temporalis muscular forces as well as the occlusal forces acting on first molars, canines, and incisors. The maximum stress occurs at the center of fixation devices at symphyseal fracture. The maximum stress values were 877.4\u2009MPa for the reconstruction plate and 646.8\u2009MPa for the mini-plates. The plates maintained the fracture width at mid-region better than superior and inferior. The maximum fracture gap were 1.10 and 0.78\u2009mm for reconstruction plate and mini-plates, respectively. The fracture site\u2019s elastic strain stabilized with the reconstruction plate was 1089.0\u2009microstrains and with the mini-plates was 399.6\u2009microstrains. The treatment of a mandibular symphyseal fracture using a mini-plates provides more adequate fracture stability for new bone formation and mechanically safer than locking reconstruction plate. Mini-plates fixation was able to control the fracture gap better than the reconstruction plate. Mini-plates technique was considered as the first choice of internal fixation, however, a reconstruction plate can also be used in case of unavailability and complication related to mini-plating.<\/jats:p>","DOI":"10.1177\/09544119231168506","type":"journal-article","created":{"date-parts":[[2023,4,18]],"date-time":"2023-04-18T05:12:03Z","timestamp":1681794723000},"page":"597-606","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Biomechanical evaluation of two internal fixation systems for the treatment of mandibular symphyseal fracture"],"prefix":"10.1177","volume":"237","author":[{"given":"Udom","family":"Wongwaithongdee","sequence":"first","affiliation":[{"name":"Faculty of Dentistry, Western University, Pathumthani, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Samroeng","family":"Inglam","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Thammasat University, Pathumthani, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1386-5885","authenticated-orcid":false,"given":"Nattapon","family":"Chantarapanich","sequence":"additional","affiliation":[{"name":"Digital Industrial Design and Manufacturing Research Unit, Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University, Chonburi, Thailand"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2023,4,18]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0030-4220(85)90002-7"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/0278-2391(83)90297-5"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.injury.2011.03.031"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.coms.2013.07.002"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joms.2011.01.032"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joms.2011.08.042"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1007\/s12663-013-0573-9"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.4103\/1658-354X.76476"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0901-5027(05)80533-8"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/0030-4220(88)90183-1"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-71034-6"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0301-0503(78)80062-9"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joms.2009.03.069"},{"key":"e_1_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.5005\/jp-journals-10024-1099"},{"key":"e_1_3_2_16_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10006-019-00762-5"},{"key":"e_1_3_2_17_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joms.2008.06.013"},{"key":"e_1_3_2_18_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.mri.2012.05.001"},{"key":"e_1_3_2_19_2","first-page":"8","article-title":"FEM sensitivity analyses on the stress levels in a human mandible with a varying ATM modelling complexity","volume":"4","author":"Armentani E","year":"2010","unstructured":"Armentani E, Caputo F, Citarella R. 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