Finite element analysis(FEA) is a computer technique of structural stress analysis and developed in engineering mechanics. FEA has developed to investigate structural behavior of human bones over the past 40 years. Wh...Finite element analysis(FEA) is a computer technique of structural stress analysis and developed in engineering mechanics. FEA has developed to investigate structural behavior of human bones over the past 40 years. When the faster computers have acquired, better FEA, using 3-dimensional computed tomography(CT) has been developed. This CT-based finite element analysis(CT/FEA) has provided clinicians with useful data. In this review, the mechanism of CT/FEA, validation studies of CT/FEA to evaluate accuracy and reliability in human bones, and clinical application studies to assess fracture risk and effects of osteoporosis medication are overviewed.展开更多
In a full-arch implant rehabilitation ad modum Branemark, the distribution of stress and strain in mandibular bone is influenced by the type, number and position of implants used. In particular, the biomechanical beha...In a full-arch implant rehabilitation ad modum Branemark, the distribution of stress and strain in mandibular bone is influenced by the type, number and position of implants used. In particular, the biomechanical behaviour of the bone structure after complete osseointegration depends on the load transferred to the bone by each fixture. In this study, a finite-element analysis of two models was performed. Models of an all-on-four configuration and a six-implant configuration were compared in a worst-case scenario. A new V parameter is presented to aid the quantitative and comparative analysis of the all-on-four and six-implant configurations. The influence of orthotropy was also investigated, and a geometric change in the all-on-four configuration is presented.展开更多
目的:观察疏风清热合剂对兔桡骨骨折早期骨组织形态与强度的影响。方法:将造模后的36只新西兰雄性家兔随机分成3组:模型对照组、生理盐水组、疏风清热合剂组,其中疏风清热合剂组于造模后以10 m L(kg·d)灌胃,实验中每5 d称重1次,根...目的:观察疏风清热合剂对兔桡骨骨折早期骨组织形态与强度的影响。方法:将造模后的36只新西兰雄性家兔随机分成3组:模型对照组、生理盐水组、疏风清热合剂组,其中疏风清热合剂组于造模后以10 m L(kg·d)灌胃,实验中每5 d称重1次,根据体质量调节给药量。每日1次,连续给药10 d。生理盐水组给予同等剂量的生理盐水灌胃,对照组不做任何处理仅一起进行指标检测。通过X线检查,骨组织形态学分析与骨生物力学三点弯曲试验观察3组家兔骨组织形态与强度并进行对比。结果:疏风清热合剂组动物骨折处X线检查评分高于生理盐水组与对照组,骨组织形态分析骨痂成骨细胞计数疏风清热合剂组高于生理盐水组与对照组,骨生物力学三点弯曲试验示动物骨折处的抗弯曲能力疏风清热合剂组高于生理盐水组与对照组。结论:疏风清热合剂对家兔骨折早期有明显的促进愈合的作用。展开更多
基金Supported by Japan Society for the Promotion of Science KAKENHI,No.26462284
文摘Finite element analysis(FEA) is a computer technique of structural stress analysis and developed in engineering mechanics. FEA has developed to investigate structural behavior of human bones over the past 40 years. When the faster computers have acquired, better FEA, using 3-dimensional computed tomography(CT) has been developed. This CT-based finite element analysis(CT/FEA) has provided clinicians with useful data. In this review, the mechanism of CT/FEA, validation studies of CT/FEA to evaluate accuracy and reliability in human bones, and clinical application studies to assess fracture risk and effects of osteoporosis medication are overviewed.
文摘In a full-arch implant rehabilitation ad modum Branemark, the distribution of stress and strain in mandibular bone is influenced by the type, number and position of implants used. In particular, the biomechanical behaviour of the bone structure after complete osseointegration depends on the load transferred to the bone by each fixture. In this study, a finite-element analysis of two models was performed. Models of an all-on-four configuration and a six-implant configuration were compared in a worst-case scenario. A new V parameter is presented to aid the quantitative and comparative analysis of the all-on-four and six-implant configurations. The influence of orthotropy was also investigated, and a geometric change in the all-on-four configuration is presented.
文摘目的:观察疏风清热合剂对兔桡骨骨折早期骨组织形态与强度的影响。方法:将造模后的36只新西兰雄性家兔随机分成3组:模型对照组、生理盐水组、疏风清热合剂组,其中疏风清热合剂组于造模后以10 m L(kg·d)灌胃,实验中每5 d称重1次,根据体质量调节给药量。每日1次,连续给药10 d。生理盐水组给予同等剂量的生理盐水灌胃,对照组不做任何处理仅一起进行指标检测。通过X线检查,骨组织形态学分析与骨生物力学三点弯曲试验观察3组家兔骨组织形态与强度并进行对比。结果:疏风清热合剂组动物骨折处X线检查评分高于生理盐水组与对照组,骨组织形态分析骨痂成骨细胞计数疏风清热合剂组高于生理盐水组与对照组,骨生物力学三点弯曲试验示动物骨折处的抗弯曲能力疏风清热合剂组高于生理盐水组与对照组。结论:疏风清热合剂对家兔骨折早期有明显的促进愈合的作用。
