In vitro biomechanical evaluation of sagittal split osteotomy fixation with a specifically designed miniplate

Filho, Valfrido Antônio Pereira; Iamashita, Heric Yukio; Monnazzi, Marcelo Silva; Gabrielli, Mário Francisco Real; Vaz, Luı́s Geraldo; Pásseri, Luís Augusto

doi:10.1016/j.ijom.2012.07.008

Cited by 27 publications

(35 citation statements)

References 29 publications

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“…The sheep mandible has been chosen for these studies because of its similarities in size and thickness to the human mandible (Wittenberg et al). A few studies that used the entire mandible included mechanical tests with the possibility of applying homolateral and contralateral levers (Pereira-Filho et al, 2013;Trivellato et al, 2014). Finally, we must consider that a metallic support on bearings was used for the mechanical test, allowing the movement and deformation of the mandibles as a whole during the application of the load, to imitate the freedom of functional movement of a human mandible, docked in the mandibular cavities and free in all other regions (Landgraf).…”

Section: Resultsmentioning

confidence: 99%

“…Polyurethane hemimandibles have been used in many studies regarding fixation systems for fractures or orthognathic surgery (Goulart et al; de Medeiros et al;Pereira-Filho et al, 2013Peterson et al;Lima et al). However, the natural mandible has a single response under stress that should be taken into account in the choice of substrate to be used in the studies, and this presents the possibility of entrapment observed after fracture.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies on the fixation systems for fractures (Goulart et al, 2015;de Medeiros et al, 2016;Pereira-Filho et al, 2016) or orthognathic surgery (Peterson et al;Pereira-Filho et al, 2013;Lima et al, 2015) have been performed in polyurethane hemimandibles. These comprise synthetic replicas with the purpose of providing anatomical and structural patterns similar to human bone, including dense and compact cortical structures filled by a porous medullary (Ribeiro-Junior et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Biomechanical Evaluation of the Sheep Mandible as a Model for Studying Fixation Methods

Carvalho¹,

Saavedra²,

Ballester³

et al. 2018

Int. J. Morphol.

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Recently, there has been increased interest in the use of natural jaws for better results in bone fixation studies. Thus, the sheep mandible has been chosen for such studies. The aim of this study was to evaluate the length and resistance of the sheep mandible when submitted to a compression test with freedom in the three axes of space. Seventy fresh sheep (Ovis aries) mandibles were used in this study. Initially, the soft tissues were removed, and measurements of the mandible size were performed. Fifty mandibles were selected for mechanical testing based on the mean values from this assessment. The mandibles were joined by fixation in the symphyseal region and were tridimensionally deformed. A metallic support suitable for study of the mandible under efforts with freedom in the three axes in space was used. For this test, three displacement cycles were applied. Based on the mean stiffness, 35 mandibles were selected. The mean value of the sheep mandible mensuration was 13.6 cm ± 0.53 cm. The mean value of the sheep mandible stiffness was 153.5N ± 54.0 N. These data are useful for future studies on fixation systems for fractures and orthognathic surgery.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biomechanical Evaluation of the Sheep Mandible as a Model for Studying Fixation Methods

Carvalho¹,

Saavedra²,

Ballester³

et al. 2018

Int. J. Morphol.

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“…Despite their greater flexibility due to their larger grains, the G4 plates have optimal mechanical strength. Iamashita et al [25], evaluating three fixation techniques used for sagittal osteotomy of the mandibular branch, using the same G4 commercial brand system, reported a lower resistance of the plates to compressive loads when compared to that of the bicortical screws; what was expected due to different fixation techniques used.…”

Section: Discussionmentioning

confidence: 98%

Mechanical and microstructural properties of fixation systems used in oral and maxillofacial surgery

Mendes

Medeiros

Lauria

et al. 2015

Oral Maxillofac Surg

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“…The international literature has shown that the use of three bicortical screws in an inverted‐L pattern produces better mechanical resistance than miniplates. However, the use of this method carries the risk of damage to adjacent structures, such as teeth, nerves or vessels, due to a need for transcutaneous access.…”

Section: Introductionmentioning

confidence: 99%

Fixation of sagittal split ramus osteotomy of the mandible: a comparative assessment of three techniques based on mechanical, photoelastic and finite element analysis

et al. 2017

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Aim:The purpose of the present study was to compare the mechanical characteristics and stress distribution when using two plates, or two plates joined by bridge, in the fixation of sagittal split ramus osteotomy (SSRO). Material and methods: A 3D finite element model of a hemimandible was created and a 5 mm advancement SSRO was simulated on a computer model. The model was fixed using three different techniques: two plates; two plates joined by one bridge; and two plates joined by two bridges. Load was applied until 3 mm displacement was attained and the results were compared with previous mechanical and photoelastic tests, thus analysing the mechanical stress developed in the proximity of miniplates and screws, as well as within the fixation system itself. Results: Fixation with two separate plates produced better mechanical resistance in the mechanical test for peak displacement, peak and ending load. In the photoelastic test, the same group exhibited better stress distribution, far from the osteotomy line. In the finite element analysis, the best technique involved two plates joined by one bridge, with the results showing a more uniform stress distribution. Conclusions: This article may provide knowledge about the rational advantages of using two plates, which produced more mechanical resistance and better stress distribution. Clinical relevanceScientific rationale for study Several companies offer osteosynthesis products to use in orthognathic surgery. When the surgeon decided to use two 2.0 mm plates in the fixation of sagittal split ramus osteotomy, is the addition of one or two bridges between the plates improves mechanical stability? Principal findingsTwo plates without bridge showed highest mechanical resistance and better stress distribution for areas of thicker bone. Practical implicationsThis article provides knowledge about the advantages of choosing separated plates in the fixation of mandibular sagittal split osteotomies.Oral Surgery 10 (2017) e48--e54.

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In vitro biomechanical evaluation of sagittal split osteotomy fixation with a specifically designed miniplate

Cited by 27 publications

References 29 publications

Biomechanical Evaluation of the Sheep Mandible as a Model for Studying Fixation Methods

Biomechanical Evaluation of the Sheep Mandible as a Model for Studying Fixation Methods

Mechanical and microstructural properties of fixation systems used in oral and maxillofacial surgery

Fixation of sagittal split ramus osteotomy of the mandible: a comparative assessment of three techniques based on mechanical, photoelastic and finite element analysis

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