In vitro study of a modified sagittal split osteotomy fixation technique of the mandible: a mechanical test |
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Authors: | C.L. Sonego M.A.R. Scheffer O.L. Chagas Júnior B.M. Vetromilla L.P. Fernandes A. Ozkomur A.N. Silva Júnior S.A.Q. Miguens Júnior P.A.G. Hernandez |
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Affiliation: | 1. Graduate Program in Dentistry, Oral and Maxillofacial Surgery, Lutheran University of Brazil, Canoas, RS, Brazil;2. Oral and Maxillofacial Surgery Residency Program, University Hospital, Federal University of Pelotas, Pelotas, RS, Brazil;3. Graduate Program in Dentistry, Prosthodontics, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil |
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Abstract: | This study was performed to evaluate the compressive mechanical strength of rigid internal fixation (RIF) using 1.5-mm L-shaped plates fixed with monocortical screws in sagittal split osteotomy (SSO). Thirty synthetic hemimandibles, which had all undergone a 5-mm advancement, were divided into three groups: three 12-mm bicortical titanium screws were placed in an inverted L pattern in group A; one straight 2.0-mm system spaced titanium plate fixed with four 5-mm monocortical screws was used in group B; two 1.5-mm system L-shaped titanium plates, each fixed with four 5-mm monocortical screws, were used in group C. The models were subjected to compressive and progressive mechanical tests with forces applied in the area between the second premolar and first molar to verify resistance in Newtons (N). A displacement speed of 1 mm/min was applied, with a maximum 10 mm displacement of the distal segment or until disruption of the fixation. The deformity and/or eventual rupture of the plates were evaluated, and consequently their technical stability was determined. The results showed that the modified fixation technique tested in this study on synthetic mandibles resulted in adequate stability and superior mechanical behaviour compared to simulated osteosynthesis with the use of a straight 2.0-mm titanium plate. |
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Keywords: | sagittal split osteotomy of the mandibular ramus fracture fixation material resistance |
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