Purpose: Relapse caused by clockwise (opening) rotation of the distal segment (dentate segment) in the sagittal plane is one of the postoperative complications sometimes seen after sagittal split ramus osteotomy. The force involved in this movement is primarily exerted by the masticatory and suprahyoid muscles. For postoperative stability, we have used two plates on each side: a straight plate placed over the vertical osteotomy line at the buccal surface of the first molar and an L-shaped plate placed at the distal or lateral part of the last molar over the osteotomy line, just crossing over the upper-lateral edge of the buccal shelf, to prevent the tail of the distal segment from moving upward. Although postoperative stability was clinically fine, experimental evaluations have not previously been performed. To clarify the effects of the L-shaped plate, we performed an experimental study using a bioabsorbable plate system.
Methods: A custom-fabricated jig was made to simulate rotational movement of the segments. Two segments made from polyoxymethylene resin were fixed with a four-hole straight or four-hole box poly-L-lactate bioabsorbable plate. An L-shaped plated was then added for rigidity, and mechanical testing was performed.
Results: The yield load exerted by the four-hole straight plate alone was 152.4 ± 11.0 N. This increased significantly to 273.8 ± 43.7 N with addition of an L-shaped plate (P < 0.05).
Conclusion: Addition of an L-shaped plate significant improves the rigidity of four-hole straight plate fixation in a bioabsorbable plate system.
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http://dx.doi.org/10.1007/s10006-011-0266-9 | DOI Listing |
J Stomatol Oral Maxillofac Surg
November 2024
Inönü University, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Malatya, Turkey. Electronic address:
Aim: This study aimed to investigate the biomechanical properties of 60 % carbon fiber-reinforced polyetheretherketone (Cfr-PEEK), which exhibits high mechanical strength and can address the limitations of titanium mini plates used in Le Fort I osteotomy.
Material And Method: Models were created using the FEA method based on tomography images of adult individuals. A 5 mm maxillary advancement was applied to the models following Le Fort I osteotomy.
Clin Biomech (Bristol)
October 2023
Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 600 Yishan Road, Shanghai 200233, China. Electronic address:
Background: Lateral intra-articular varus osteotomy is an L-shaped osteotomy of the lateral tibial condyle to correct mild knee valgus and lateral plateau malunion of the proximal tibia. In order to minimize injury, it was modified to preserve the posterolateral cortex and the upper tibiofibular joint. The aim of this study was to evaluate the stability of modified lateral intra-articular varus osteotomy by comparing the biomechanical strength with lateral intra-articular varus osteotomy.
View Article and Find Full Text PDFJ Maxillofac Oral Surg
June 2024
Maxillofacial Surgery Department, Tabriz University of Medical Sciences, Tabriz, Iran.
Introduction: To compare the biomechanical parameters of microplates and the combined miniplate-microplate for fixing zygomaticomaxillary complex (ZMC) fractures using nonlinear finite element analysis (FEA).
Material And Methods: Two samples of ZMC fracture models were prepared. In sample 1 (S1), the fractures were stabilized with microplates, and in sample 2 (S2), with miniplates plus microplates.
Med Eng Phys
July 2024
State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Department of Orthognathic and TMJ Surgery, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China. Electronic address:
Objective: To evaluate and compare the biomechanical behavior of three-dimensionally (3D) printed patient-specific Ti6Al4V with commercially made titanium mini plates following Lefort-I osteotomy using finite element analysis.
Methods: Le Fort I osteotomy was virtually simulated with a 5 mm maxillary advancement and mediolateral rotation in the coronal plane, resulting in a 3 mm gap on the left side's posterior. Two fixation methods were modeled using software to compare 3D-printed Ti6Al4V and commercial titanium mini plates, both featuring a 4-hole l-shape with thicknesses of 0.
Int J Surg Case Rep
July 2024
Department of Orthopaedic Surgery, Ashikaga Red Cross Hospital, Ashikaga-shi, Tochigi, Japan.
Introduction: Avulsion fractures of the calcaneal tuberosity with significant displacement can cause soft tissue complications in the heel. However, a treatment strategy for calcaneal tuberosity fractures with poor heel-skin condition is yet to be established. Here, we report a case involving avulsion fracture of the calcaneal tuberosity presenting with superficial skin necrosis that was treated with a plate lacking the anterior component and screws inserted percutaneously.
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