scholarly journals Numerical design studies on a novel electrostimulative osteosynthesis system for the mandible

2017 ◽  
Vol 3 (2) ◽  
pp. 613-617 ◽  
Author(s):  
Hendrikje Raben ◽  
Christian Schmidt ◽  
Karthik Sridhar ◽  
Peer W. Kämmerer ◽  
Ursula van Rienen
Keyword(s):  
Finite Element Method ◽  
Electric Field Distribution ◽  
Bone Defects ◽  
Fracture Site ◽  
The Finite Element Method ◽  
Reconstruction Plate ◽  
Design Studies ◽  
Mandibular Bone ◽  
Numerical Design ◽  
Crucial Parameter

AbstractFractures or other major bone defects in the mandible are commonly treated by mounting a reconstruction plate at the fracture site. To avoid complications due to loosening of the implant or the fixation screws, electrical stimulation presents a possibility to accelerate bone healing. The aim of this study was to investigate different combinations of activated electrodes and plate designs regarding their feasibility for electrostimulation of the mandibular bone. The electric field distribution for multiple implant designs was computed using the finite element method. The results suggest that the electrode insulation renders a crucial parameter, which influences substantially the stimulation impact and its power consumption.

Voltage Distribution Studies in Polluted ZnO Arrester Using the FEMLAB

2011 ◽  
Vol 268-270 ◽  
pp. 412-417 ◽  
Author(s):  
Ferhat Tighilt
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Metal Oxide ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
The Finite Element Method ◽  
Voltage Distribution ◽  
Distribution Studies ◽  
Long Operation

The voltage and electric field distribution in an arrester are very important for its long operation 15 kV with and without pollution. In order to clarify the influence of pollution severity conditions on metal oxide surge arrester, the finite element method (FEM) compilation of the voltage distribution in the ZnO column varistors under different pollution layer conductivity (200 μS, 70μS, 20μS) and clean was employed using the FEMLAB package.

Optimizing Design of Accessories for High-Voltage XPLE Power Cables

2013 ◽  
Vol 441 ◽  
pp. 189-194
Author(s):  
Chao Jie Yang ◽  
Jie Chen ◽  
Zhi Song Xie ◽  
Yi Hui Zeng ◽  
Dao Long Wang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Optimization Design ◽  
Electric Field Distribution ◽  
Power Cable ◽  
Power Cables ◽  
The Finite Element Method ◽  
Electric Stress ◽  
Optimizing Design

This paper describes the optimization design of prefabricated XPLE cable accessories and presents the formula of the design of stress cone. The finite element method for optimizing the design of the electric stress distribution inside the HV power cable joint and adjusting the length and curvature of the stress cone of this termination is discussed. The relationships between dimensions of stress cones structure and the electric field distribution were obtained.

Design and Manufacturing of a Temporomandibular Joint (TMJ) Prosthesis for Mandibular Bone Necrosis Using the Finite Element Method

2018 ◽  
pp. 393-439 ◽  
Author(s):  
Juan Alfonso Beltrán-Fernández ◽  
Luis Héctor Hernández-Gómez ◽  
Juan Luis Cuevas-Andrade ◽  
Jesús Eduardo Campa-Zuno ◽  
Alfredo de la Peña-Muñoz ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temporomandibular Joint ◽  
The Finite Element Method ◽  
Mandibular Bone ◽  
Bone Necrosis ◽  
Design And Manufacturing ◽  
Element Method

In Vitro Mechanical Evaluation of Mandibular Bone Transport Devices

2014 ◽  
Vol 8 (2) ◽  
Author(s):  
Uriel Zapata ◽  
Ikuya Watanabe ◽  
Lynne A. Opperman ◽  
Paul C. Dechow ◽  
Timothy Mulone ◽  
...  
Keyword(s):  
Numerical Models ◽  
Surgical Techniques ◽  
Experimental Tests ◽  
Bone Defects ◽  
Bone Transport ◽  
Reconstruction Plate ◽  
Mandibular Bone ◽  
Biomechanical Behavior ◽  
Extreme Loads

Bone transport distraction osteogenesis (BTDO) is a surgical procedure that has been used over the last 30 years for the correction of segmental defects produced mainly by trauma and oncological resections. Application of BTDO has several clinical advantages over traditional surgical techniques. Over the past few years, several BTDO devices have been introduced to reconstruct mandibular bone defects. Based on the location and outline of the defect, each device requires a uniquely shaped reconstruction plate. To date, no biomechanical evaluations of mandibular BTDO devices have been reported in the literature. The present study evaluated the mechanical behavior of three different shaped prototypes of a novel mandibular bone transport reconstruction plate and its transport unit for the reconstruction of segmental bone defects of the mandible by using numerical models complemented with mechanical laboratory tests to characterize strength, fatigue, and stability. The strength test evaluated device failures under extreme loads and was complemented with optimization procedures to improve the biomechanical behavior of the devices. The responses of the prototypes were characterized to improve their design and identify weak and strong regions in order to avoid posterior device failure in clinical applications. Combinations of the numerical and mechanical laboratory results were used to compare and validate the models. In addition, the results remark the importance of reducing the number of animals used in experimental tests by increasing computational and in vitro trials.

scholarly journals Comparative Numerical Analysis between Two Types of Orthodontic Wire for the Lingual Technique, Using the Finite Element Method

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Rosa Alicia Hernández-Vázquez ◽  
Rodrigo Arturo Marquet-Rivera ◽  
Octavio Alejandro Mastache-Miranda ◽  
Angel Javier Vázquez-López ◽  
Salvador Cruz-López ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Clinical Trial ◽  
Finite Element ◽  
3D Imaging ◽  
Fem Analysis ◽  
The Finite Element Method ◽  
Mandibular Bone ◽  
Orthodontic Wire ◽  
Lingual Technique ◽  
The Comparative Study

In the lingual orthodontic technique, there are two paradigms regarding the type of wire used. Regardless of the material or gauge, some orthodontists choose to use the straight wire and resin and bond it to the surface of the tooth; they call it compensations. Other orthodontists prefer to bend the wire, giving it a mushroom shape. There is no specific indication for the use of each type of wire, so orthodontists use them according to their criteria. The present study establishes the bases so that it is possible to find the indications for each type of wire. A clinical trial of a lingual orthodontic patient was used. To carry out the comparative study, a straight arch was placed in his right arch and a mushroom arch in the left arch. Using 3D imaging, a high-biofidelity biomodel of the patient’s mandible was generated, with which the FEM analysis was performed, which allowed comparing the reactions of the mandibular bone and appliances with the different arches. It was found that, on the side with the straight arch, there were greater deformations, and in the mushroom arch, there were greater stresses. With this, it is possible to find which clinical cases in each type of wire are indicated.

scholarly journals Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2510 ◽  
Author(s):  
Haitao Hu ◽  
Xiaohong Zhang ◽  
Yanli Liu ◽  
Lijun Guo ◽  
Junguo Gao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Nonlinear Coefficient ◽  
The Finite Element Method ◽  
Physical Size ◽  
Protection Layer ◽  
The Difference

The electric field distribution at the end of a large hydro-generator is highly nonuniform and prone to corona discharge, which damages the main insulation and significantly reduces the service life of the hydro-generator. In order to reduce the thickness of the main insulation and the physical size of a large hydro-generator, it is necessary to understand the distribution of the electric field at the end of its stator bar. In this paper, the stator bar at the end of a large generator is simulated using the finite element method to determine the distribution of the potential, electric field, and loss at the rated voltage, as well as to elucidate the differences between the linear corona protection, two-segment nonlinear corona protection, and three-segment nonlinear corona protection structures. The influences of the arc angle, length of each corona protection layer, intrinsic resistivity of the corona protection material, and nonlinear coefficient are also analyzed. The results manifest that the angle of the stator bar should be 22.5°, the difference in resistivity between the two adjacent corona protection coatings should not exceed two orders of magnitude, and the resistivity of the medium resistivity layer should be nearly 106 Ω·m or 107 Ω·m, for an optimal design of the corona protection structure.

Sign in / Sign up

Export Citation Format

Share Document