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Structural optimization of patient-specific temporomandibular joint replacement implants for additive manufacturing:novel metrics for safety evaluation and biomechanical performance

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Bio-Design and Manufacturing 2022年第2期5卷 333-347页

作者： Manuel Pinheiro Anouar Krairi Robin Willaert Maria C.Costa Wim Van Paepegem Mechanics of Materials and Structures(MMS) Ghent UniversityGhentBelgium Materials Innovation Institute(M2i) DelftThe Netherlands Department of Oral and Maxillofacial Surgery University Hospitals Leuven LeuvenBelgium 4 Department of Head and Neck SurgeryGhent University HospitalGhentBelgium

Total temporomandibular joint(TMJ)replacement is recommended only when there is irreversible damage to the joint and no conservative treatment can provide functional *** stock and custom-made TMJ implants have been made available;however,retrospective and comparative studies were unable to find significant differences between the two types of *** introduction of additive manufacturing(AM)techniques in medical practice allows for a greater freedom of design and a higher degree of device *** combination of AM with structural optimisation may streamline development and provide the key for fabricating biomechanic ally enhanced TMJ *** this study,structural optimis ation techniques were applied to develop and numerically validate a patient-specific TMJ *** biomechanical behaviour of each intermediate TMJ design was assessed under four different nominal and maximum biting tasks using finite element *** addition,a new set of metrics were proposed to compare each design regarding biomechanical performance and implant *** results suggest that 55-82%of the natural/intact strain patterns can be recovered with the finally selected TMJ *** represents an increase of 15%in biomechanical performance for incisor biting,15%for right molar biting,17%for left molar biting and a decrease of 2%for left group biting compared with the initial *** results also suggest that load transfer at the proximal ramus reduces the implant’s impact on the mandible’s strain ***,structural optimisation allows for a volume reduction of up to 44%with a minimum loss of implant safety and biomechanical performance.

关键词： Temporomandibular joint Additive manufacturing Implant safety biomechanical performance Finite element analysis

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Comparison of the biomechanical performance of three spinal implants for treating the wedge-shaped burst fractures

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Medicine in Novel Technology and Devices 2022年第1期13卷 71-78页

作者： Tingxiang Gong Yongtao Lu Liangliang Cheng Department of Engineering Mechanics Dalian University of TechnologyDalianChina DUT-BSU Joint Institute Dalian University of TechnologyNo.2 Linggong Road116024DalianChina Affiliated Zhongshan Hospital of Dalian University DalianChina

Spinal fracture is a serious problem impairing life quality,associating with low back pain and many other chronic *** all the spinal fractures,the rate of thoracolumbar fractures is the highest and accounts for approximately 90%.Although surgical treatment is an effective approach,it is still unclear which treatment method performs the *** aim of the present study was to investigate the biomechanical performance of three spinal implants for treating the thoracolumbar wedge-shaped burst fractures using the finite element(FE)*** model of the T12/L1/L2 spinal segment was created from CT images and the thoracolumbar wedge-shaped burst fractures were created by removing some elements in the anterior part of *** FE models of the traditional system,the universal spine system(USS)and the cortical bone trajectory(CBT)system were created and their biomechanical performances were *** results revealed that among the three fixation systems,the highest von-Mises stress occurred in the CBT *** all the loading scenarios except for the lateral bending,the maximal von-Mises stress was higher when the USS system rather than the traditional system was *** average displacement around the fracture site was the highest in the CBT *** for the lateral bending,the average displacement around the fracture site was higher when the USS system rather than the traditional system was *** all the fixation approaches,the highest von-Mises stress always occurred at the screw *** present study provided important data for the treatment of thoracolumbar wedge-shaped burst *** example,the traditional spinal system is preferentially selected for the thoracolumbar wedgeshaped burst fracture of L1.

关键词： Spinal fracture Fixation implant Finite element biomechanical performance Stress analysis

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A critical review on the biomechanical study of cervical interbody fusion cage

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Medicine in Novel Technology and Devices 2021年第3期11卷 47-84页

作者： Huiwen Huang Jinglong Liu Lizhen Wang Yubo Fan Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijingChina

Anterior Cervical Discectomy and Fusion(ACDF)is the preferred surgical method for the treatment of severe cervical degenerative disc disease with radiculopathy or myelopathy,of which the objectives are to restore the normal height of intervertebral space and cervical lordosis through the implantation of cervical interbody fusion *** biomechanical performance of a cervical interbody fusion cage,which plays a significant role in achieving the goals of ACDF,is influenced by multiple *** this paper,various studies focusing on the biomechanical performance of cervical interbody fusion cage are ***,the research methods,biomechanical evaluation parameters and data analysis methods of these research are analyzed in order to obtain a comprehensive understanding of the progress and limitations of research in this *** great progress has been made to clarify the biomechanical behaviors of cervical interbody fusion cage,there is still controversy regarding the issues such as the relative contribution of multiple factors to the performance of cage,the interactions among these factors,as well as whether the effects of factors change with the process of intervertebral osseointegration and so ***,investigations are still needed to improve the comprehension of cervical interbody fusion cage biomechanically.

关键词： Anterior cervical discectomy and fusion Cervical interbody fusion cage biomechanical performance Mechanical stability Cage subsidence Adjacent segment degeneration

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biomechanical Characteristics of Rape Stalks

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Agricultural Science & Technology 2012年第5期13卷 972-978页

作者：吴晓强闫鹏王鑫曹中华刘春利韩彩锐牛应泽四川农业大学信息与工程技术学院四川雅安625014 四川农业大学农学院四川成都611130

[Objective] To study the correlation between the biomechanical properties of rape stalks and rape stem lodging. [Method] Through axial compression tests to the stalks of 4 different rape varieties, the change rules of maximum stem bearing ca- pacity, maximum compressive strength, elastic modulus and moment of inertia along plant height were analyzed, as well as the effect of different varieties and water contents on the biomechanical property indices of rape stalks. [Result] The maximum loads of rape stalks presented liner decrease trend along with the increase of stem height, and all reached the maximums below the height of 50 cm. The maximum stem compressive strength and elastic modulus of the 4 varieties were increased with ascending height, but in a slow rate with small change, thus the modulus of e- lasticity could be considered as unchanged. The maximum bearing capacity, maxi- mum compressive strength and elastic modulus of dry rape stalks were higher than wet stalks, indicating that the water contents of rape stalks had significant effect on their mechanical properties. According to the actual lodging situations in filed, stalks of variety No. 1 owned the worst biomechanical properties and lodging degree, while the biomechanical properties of No. 6 and F5 were better than No. 1 and No. 9, and they also had stronger lodging-resistance. [Conclusion] The study provides parameters and bases for the design of mechanized production and mechanical deep processing of crops, and can better reveal the physical natures of organisms. The methods used in this study can also be used to screen excellent crop stalks.

关键词： Rape stalk Lodging Axial compression Plant height biomechanical performance

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