Objective To investigate the effect of computer aided 3D simulation technique for treating complicated foot and ankle fractures precisely.Methods From November 2007 to August 2009,255 patients with complicated foot an...Objective To investigate the effect of computer aided 3D simulation technique for treating complicated foot and ankle fractures precisely.Methods From November 2007 to August 2009,255 patients with complicated foot and ankle fractures展开更多
To understand the relationship between the process-microstructure-mechanical properties of the high-pressure die-casting(HPDC) AE44 magnesium alloy, 3D reconstruction and 2D characterization were carried out on the HP...To understand the relationship between the process-microstructure-mechanical properties of the high-pressure die-casting(HPDC) AE44 magnesium alloy, 3D reconstruction and 2D characterization were carried out on the HPDC castings produced with different process parameters(low slow-shot speed, fast slow-shot speed, solidification pressure). Microstructural characterization revealed that the formation of shrinkage pores are closely related to ESCs, which were mainly controlled by the low slow-shot speed in shot sleeve(ESCs growth time) and fast slow-shot speed into the die cavity(distribution of ESCs). In addition, solidification pressure can significantly reduce the shrinkage porosity in the center by improving the feeding capacity of liquid metal. Tensile fracture revealed that the tearing ridge is mainly evolved from the slip band of ESCs. The quantity and distribution of ESCs determine the fracture mode of castings. The relationship between mechanical properties of castings and the morphology of ESCs and porosity is also statistically discussed.展开更多
Facial fracture repair is time-dependent.Early reduction and fixation after trauma help with later repair.Abnormal healing caused by delayed repair increases not only the difficulty of reconstruction,but also the risk...Facial fracture repair is time-dependent.Early reduction and fixation after trauma help with later repair.Abnormal healing caused by delayed repair increases not only the difficulty of reconstruction,but also the risk of aesthetic or functional defects.Digital technology was used to model local trauma in three dimensions.The fracture fragments were reset,and the facial shape was reconstructed on the reset model.After resampling,3D printing was used to construct a personalised external fixation helmet.Combined with the posterior nasal passage lift reduction technique,early reduction of the mid-face fractures was performed.Through the early application of a 3D-printed personalised external fixation helmet to a patient with a comprehensive fracture,the helmet manufacturing process and application methods were introduced,and the effect of this application was investigated.In the treatment of facial fractures,the early application of a 3D-printed personalised external fixation helmet is conducive to fracture reduction and fixation and reduces the difficulty of later reconstruction.展开更多
文摘Objective To investigate the effect of computer aided 3D simulation technique for treating complicated foot and ankle fractures precisely.Methods From November 2007 to August 2009,255 patients with complicated foot and ankle fractures
基金financially supported by the Fundamental Research Funds for the Central Universities (M22JBMC0060)the National Natural Science Foundation of China (No.52175284)the State Key Lab of Advanced Metals and Materials (No.2021-ZD08)。
文摘To understand the relationship between the process-microstructure-mechanical properties of the high-pressure die-casting(HPDC) AE44 magnesium alloy, 3D reconstruction and 2D characterization were carried out on the HPDC castings produced with different process parameters(low slow-shot speed, fast slow-shot speed, solidification pressure). Microstructural characterization revealed that the formation of shrinkage pores are closely related to ESCs, which were mainly controlled by the low slow-shot speed in shot sleeve(ESCs growth time) and fast slow-shot speed into the die cavity(distribution of ESCs). In addition, solidification pressure can significantly reduce the shrinkage porosity in the center by improving the feeding capacity of liquid metal. Tensile fracture revealed that the tearing ridge is mainly evolved from the slip band of ESCs. The quantity and distribution of ESCs determine the fracture mode of castings. The relationship between mechanical properties of castings and the morphology of ESCs and porosity is also statistically discussed.
基金the“3D Snowball”Project of Medical College of Shanghai Jiao Tong University。
文摘Facial fracture repair is time-dependent.Early reduction and fixation after trauma help with later repair.Abnormal healing caused by delayed repair increases not only the difficulty of reconstruction,but also the risk of aesthetic or functional defects.Digital technology was used to model local trauma in three dimensions.The fracture fragments were reset,and the facial shape was reconstructed on the reset model.After resampling,3D printing was used to construct a personalised external fixation helmet.Combined with the posterior nasal passage lift reduction technique,early reduction of the mid-face fractures was performed.Through the early application of a 3D-printed personalised external fixation helmet to a patient with a comprehensive fracture,the helmet manufacturing process and application methods were introduced,and the effect of this application was investigated.In the treatment of facial fractures,the early application of a 3D-printed personalised external fixation helmet is conducive to fracture reduction and fixation and reduces the difficulty of later reconstruction.
