An In Vitro Evaluation of Rigid Internal Fixation Techniques for Sagittal Split Ramus Osteotomies: Setback Surgery

dc.creatorBrasileiro, Bernardo Ferreira
dc.creatorGrotta-Grempel, Rafael
dc.creatorBovi Ambrosano, Glaucia Maria
dc.creatorPasseri, Luis Augusto
dc.date2012
dc.date2013-09-19T18:06:40Z
dc.date2016-06-30T20:25:23Z
dc.date2013-09-19T18:06:40Z
dc.date2016-06-30T20:25:23Z
dc.date.accessioned2018-03-29T01:53:25Z
dc.date.available2018-03-29T01:53:25Z
dc.identifierJournal of Oral and Maxillofacial Surgery. W B Saunders Co-Elsevier Inc, v.70, n.4, p.941-951, 2012
dc.identifier0278-2391
dc.identifierWOS:000302482000040
dc.identifier10.1016/j.joms.2011.02.106
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/2351
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/2351
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1308393
dc.descriptionPurpose: The aim of this study was to evaluate the biomechanical features of 3 different methods of rigid internal fixation for sagittal split ramus osteotomy for mandibular setback in vitro. Materials and Methods: Sixty polyurethane replicas of human hemimandibles were used as substrates, simulating a 5-mm setback surgery by sagittal split ramus osteotomy. These replicas served to reproduce 3 different techniques of fixation, including 1) a 4-hole plate and 4 monocortical screws (miniplate group), 2) a 4-hole plate and 4 monocortical screws with 1 additional bicortical positional screw (hybrid group), and 3) 3 bicortical positional screws in a traditional inverted-L pattern (inverted-L group). After fixation, hemimandibles were adapted to a test support and subjected to lateral torsional forces on the buccal molar surface and vertical cantilever loading on the incisal edge with an Instron 4411 mechanical testing unit. Peak loadings at 1, 3, 5, and 10 mm of displacement were recorded. Means and standard deviation were analyzed using analysis of variance and Tukey test with a 5% level of significance, and failures during tests were recorded. Results: Regardless of the amount of displacement and direction of force, the miniplate group always showed the lowest load peak scores (P < .01) compared with the other fixation techniques. The hybrid group demonstrated behavior similar to the inverted-L group in lateral and vertical forces at any loading displacement (P > .05). Molar load tests required more force than incisal load tests to promote the same displacement in the mandibular setback model (P < .05). Conclusion: For mandibular setback surgery of 5 mm, this study concluded that the fixation technique based on the miniplate group was significantly less rigid than the fixation observed in the hybrid and inverted-L groups. Mechanically, adding 1 bicortical positional screw in the retromolar region in the miniplate technique may achieve the same stabilization offered by inverted-L fixation for mandibular sagittal split ramus osteotomy setback surgery in vitro. (C) 2012 American Association of Oral and Maxillofacial Surgeons J Oral Maxillofac Surg 70:941-951, 2012
dc.description70
dc.description4
dc.description941
dc.description951
dc.languageeng
dc.publisherW B Saunders Co-Elsevier Inc
dc.publisherPhiladelphia
dc.relationJournal of Oral and Maxillofacial Surgery
dc.rightsfechado
dc.sourceWOS
dc.subjectBICORTICAL SCREW FIXATION
dc.subjectTERM-FOLLOW-UP
dc.subjectMANDIBULAR SETBACK
dc.subjectBIOMECHANICAL EVALUATION
dc.subjectORTHOGNATHIC SURGERY
dc.subjectSURGICAL-CORRECTION
dc.subjectPOSITION SCREWS
dc.subjectPLATE FIXATION
dc.subjectTISSUE PROFILE
dc.subjectSTABILITY
dc.titleAn In Vitro Evaluation of Rigid Internal Fixation Techniques for Sagittal Split Ramus Osteotomies: Setback Surgery
dc.typeArtículos de revistas


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