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Evaluation and comparison of the mechanical behavior of two techniques for internal fixation of the sagittal osteotomy after advancement and clockwise rotation of the mandible: in vitro study

Grant number: 17/19171-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): February 01, 2018
Effective date (End): December 31, 2018
Field of knowledge:Health Sciences - Dentistry - Oral and Maxillofacial Surgery
Principal researcher:Alexandre Elias Trivellato
Grantee:Matheus Favaro
Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


The Bilateral Sagittal Split Osteotomy is one of the most commonly used techniques for correction of mandibular deformities, showing an extremely versatile technique, resulting in an intimate contact of the segments, favoring an effective bone remodeling, besides allowing an adequate and precise fixation , with consequent stability. With the advent of rigid internal fixation and functionally stable fixation, the use of titanium plates and screws became the "gold standard" because they increase stability, provide a rapid return to function, improve nutritional support and establish an effective maintenance of the via the area, in addition to reducing recurrence rates. The number of techniques that have been developed for internal fixation of the distal and proximal segment at the time of surgery have been extensively reviewed by numerous studies that employ the most diverse types of fixation. However, despite a wide discussion in the literature, to date, it is not possible to establish a consensus as to the most effective technique for the fixation of the bilateral sagittal spilt osteotomy in the corrections of mandibular deformities in view of each technique presenting distinct peculiarities. The present experiment will aim to perform an evaluation and comparison of the mechanical behavior of four techniques for internal fixation of the bilateral sagittal split osteotomy after advancement and mandible clockwise rotation. It will be used 28 replicates of polyurethane jaws, sectioned in a standard way, simulating 7mm of advance and mandibular clockwise rotation. The 28 replicates will be divided into 2 groups, with 14 jaws each, according to the fixation method. Group I: fixation with one 2.0mm 4-hole plate with 4 screws (2.0mm x 6mm) associated with 1 bi-cortical screw in the region retro-molar (Hybrid Technique) on each side and Group II: 2 2.0mm 4-hole plates with segment with 8 screws (2.0mm x 6mm) on each side. The loads will be applied in the incisor and right first molar regions, aiming at progressive application of force and consequently resistance value, measured in kgf. The resistance will be measured during peak load, measuring 1, 3 and 5 mm displacement at the section site. The results obtained are submitted to statistical analysis, using an analysis of variance (ANOVA), follow Tukey test, significance level of 5%. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MATTOS DE CARVALHO, PEDRO HENRIQUE; OLIVEIRA, SORAYA DA SILVA; FAVARO, MATHEUS; SVERZUT, CASSIO EDVARD; TRIVELLATO, ALEXANDRE ELIAS. Which type of method shows the best mechanical behavior for internal fixation of bilateral sagittal split osteotomy in major advancements with clockwise rotation? Comparison of four methods. ORAL AND MAXILLOFACIAL SURGERY-HEIDELBERG, JUL 2020. Web of Science Citations: 0.

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