Comparative finite element analysis of the biomechanical stability of 2.0 fixation plates in atrophic mandibular fractures.

The objective of the present study was to conduct a computational, laboratory-based comparison of the biomechanical stability of 2.0 fixation locking plates with different profiles in Class III atrophic mandibular fractures using 3-dimensional finite element analysis. Three-dimensional finite element models simulating Class III atrophic mandibular fractures were constructed. The models were divided into 4 groups according to plate thickness (1.0, 1.5, 2.0, and 2.5 mm). Fractures were simulated in left mandibular bodies, and 3 locking screws were used on each side of each fracture for fixation. Bite forces of approximately 63 N were simulated in the incisor and molar regions of the mandibles in finite element models. The level of compressive strain on the bone around the screw was within the physiological limit. No significant difference was observed in the displacement of bone segments in the fracture region. Von Mises stress was higher during simulated bites in the molar region for plates with thicknesses of 1.0 mm. Plate tension values were below the level required for permanent deformation or fracture in all models. The 2.5-mm-thick plate presented better biomechanical performance than all other plates. The 2.0-mm-thick plate also showed satisfactory results and adequate safety limits. Large-profile (2.0-mm-thick) locking plates showed better biomechanical performance than did 1.0- and 1.5-mm-thick plates and can be considered an alternative reconstruction plate for the treatment of Class III atrophic mandibular fractures.

Vajgel A ，Camargo IB ，Willmersdorf RB ，de Melo TM ，Laureano Filho JR ，Vasconcellos RJ ... -  《-》

Comparison of Neck Screw and Conventional Fixation Techniques in Mandibular Condyle Fractures Using 3-Dimensional Finite Element Analysis.

To compare the mechanical stress on the mandibular condyle after the reduction and fixation of mandibular condylar fractures using the neck screw and 2 other conventional techniques according to 3-dimensional finite element analysis. A 3-dimensional finite element model of a mandible was created and graphically simulated on a computer screen. The model was fixed with 3 different techniques: a 2.0-mm plate with 4 screws, 2 plates (1 1.5-mm plate and 1 2.0-mm plate) with 4 screws, and a neck screw. Loads were applied that simulated muscular action, with restrictions of the upper movements of the mandible, differentiation of the cortical and medullary bone, and the virtual "folds" of the plates and screws so that they could adjust to the condylar surface. Afterward, the data were exported for graphic visualization of the results and quantitative analysis was performed. The 2-plate technique exhibited better stability in regard to displacement of fractures, deformity of the synthesis materials, and minimum and maximum tension values. The results with the neck screw were satisfactory and were similar to those found when a miniplate was used. Although the study shows that 2 isolated plates yielded better results compared with the other groups using other fixation systems and methods, the neck screw could be an option for condylar fracture reduction.

Conci RA ，Tomazi FH ，Noritomi PY ，da Silva JV ，Fritscher GG ，Heitz C ... -  《-》

Feasibility of carbon-fiber-reinforced polymer fixation plates for treatment of atrophic mandibular fracture: A finite element method.

The objective of this study was to conduct a computer assessment of the biomechanical stability of locking fixation plates of different thicknesses, made of titanium alloy and carbon-fiber- reinforced polyetheretherkotone (CFR-PEEK) in Class III atrophic mandibular fractures. Class III atrophic mandibular models were constructed using three-dimensional finite element models. After simulation of fracture on the left side, plates with different thicknesses (1.0, 1.5, 2.0, and 2.5 mm) were adapted to the models and three locking screws on each side of the fracture were used for fixation. Titanium alloy and CFR-PEEK material properties were assessed for all plate models. Von Mises stress values decreased gradually with an increase in plate profile thickness. Von Mises stress values for screws and plates were lower in models using CFR-PEEK plates. An increase in plate profile enhanced the load-sharing performance of the fixation systems, with rigid titanium alloy plates sharing the load among the screws more evenly. 1.0 mm, 1.5 mm, and 2.0 mm CFR-PEEK plates produced strain values of 2-10%, which promote proper healing via formation of callus in the fracture line. In terms of investigated biomechanical parameters, and with a Young's modulus similar to that of cortical bone, CFR-PEEK materials appear to be suitable for the treatment of atrophic mandibular fractures.

Nurettin D ，Burak B 《-》

Biomechanical analysis of miniplate osteosynthesis for fractures of the atrophic mandible.

Sugiura T ，Yamamoto K ，Murakami K ，Kawakami M ，Kang YB ，Tsutsumi S ，Kirita T ... -  《-》

A 3-dimensional finite-element analysis investigating the biomechanical behavior of the mandible and plate osteosynthesis in cases of fractures of the condylar process.

Wagner A ，Krach W ，Schicho K ，Undt G ，Ploder O ，Ewers R ... -  《oral surgery oral medicine oral pathology oral radiology and endodontics》