Yubin Chen

Publications (5)8.36 Total impact

• Article: Development of a finite element model for blast injuries to the pig mandible and a preliminary biomechanical analysis.

  Tao Lei, Liangxian Xie, Wenbin Tu, Yubin Chen, Yinghui Tan
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  ABSTRACT: Explosive damages to the maxillofacial bones exhibit complex dynamic response processes; the current traditional model and methods for blast wounds are unable to meet research needs. The finite element (FE) method has obvious advantages in complex biomechanical analysis. The objective of this study was to develop an FE model for blast injuries to the pig mandible and investigate the feasibility of using FE method as an ideal research tool for mandible blast wounds. A hexahedral FE model of a pig mandible was established to simulate explosive damage in air by using MIMICS and ANSA software. Then, the FE model was imported into LS-DYNA for computation. Finally, the LS-POST was used for the analysis and the measurements. At the same time, an experimental study was performed by measuring biomechanical data (strains and accelerations) and wound patterns from fresh pig mandibles to validate our FE model and simulation result. The FE model and the dynamic processes of blast injuries to the pig mandible were developed and simulated successfully, and most of the biomechanical data and wound patterns displayed no significant differences with experimental results. Stress distribution in the mandible was relatively uniform; high-intensity strain was mainly concentrated in the mandibular angle and ramus, especially along the location of the fracture line. The FE model and method of this experiment will be helpful for investigations in the biomechanical mechanisms of mandibular blast injuries and the subsequent human maxillofacial blast injury simulation.
  The journal of trauma and acute care surgery. 08/2012; 73(4):902-7.
• Article: Blast injuries to the human mandible: Development of a finite element model and a preliminary finite element analysis.

  Tao Lei, Liangxian Xie, Wenbing Tu, Yubin Chen, Zhen Tang, Yinghui Tan
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  ABSTRACT: In an attempt to explore new tools for constructing a model of blast injuries to the human mandible, a finite element method was used. This model allowed us to perform dynamic simulations and analyse the injury processes and severity of trauma to the human mandible from an explosion striking at the middle mandibular angle. A 3D finite element model of the human mandible was created using digitally visualised CT scanning data of the human mandible. It was used to dynamically simulate the complete injury process of a blast event to a human mandible (at the middle mandibular angle) under the injury conditions of a 600mg TNT explosion. The model was also used to elucidate the subsequent mandibular damage and the dynamic distribution of several biomechanical indices (e.g., stress, and strain). The resulting data were subjected to a comparative analysis. Simulation was successfully conducted for injury events in which 600mg of TNT exploded at 3cm, 5cm and 10cm from the middle mandibular angle of a human mandible; specifically, the simulation included the dynamic injury processes and the distribution of stress and strain in various parts of the damaged mandible. A comparison of the simulation data revealed that different blast distances resulted in considerable variation in the severity and biological indices of the mandibular injury. The finite element model was able to dynamically simulate the blast-initiated trauma processes to a human mandible, which allowed for investigation of the severity of damage to the mandible under different injury conditions. This model and the simulation method are conducive for applications in basic studies and clinical investigations of blast-initiated injury mechanisms of bone tissues.
  Injury 08/2012; 43(11):1850-5. · 1.98 Impact Factor
• Article: Dynamic simulation and preliminary finite element analysis of gunshot wounds to the human mandible.

  Zhen Tang, Wenbing Tu, Gang Zhang, Yubin Chen, Tao Lei, Yinghui Tan
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  ABSTRACT: Due to the complications arising from gunshot wounds to the maxillofacial region, traditional models of gunshot wounds cannot meet our research needs. In this study, we established a finite element model and conducted preliminary simulation and analysis to determine the injury mechanism and degree of damage for gunshot wounds to the human mandible. Based on a previously developed modelling method that used animal experiments and internal parameters, digital computed tomography data for the human mandible were used to establish a three-dimensional finite element model of the human mandible. The mechanism by which a gunshot injures the mandible was dynamically simulated under different shot conditions. First, the residual velocities of the shootings using different projectiles at varying entry angles and impact velocities were calculated. Second, the energy losses of the projectiles and the rates of energy loss after exiting the mandible were calculated. Finally, the data were compared and analysed. The dynamic processes involved in gunshot wounds to the human mandible were successfully simulated using two projectiles, three impact velocities, and three entry angles. The stress distributions in different parts of mandible after injury were also simulated. Based on the computation and analysis of the modelling data, we found that the injury severity of the mandible and the injury efficiency of the projectiles differ under different injury conditions. The finite element model has many advantages for the analysis of ballistic wounds, and is expected to become an improved model for studying maxillofacial gunshot wounds.
  Injury 04/2011; 43(5):660-5. · 1.98 Impact Factor
• Article: Effect of pulse Nd:YAG laser on bond strength and microleakage of resin to human dentine.

  Xiujie Wen, Luchuan Liu, Xin Nie, Li Zhang, Manjing Deng, Yubin Chen
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  ABSTRACT: The purpose of this study was to investigate the effect of pulse Nd:YAG laser on human dentine adhesion by optimizing the laser parameter combination and comparing it with other pretreatment methods for dentine adhesion. In recent decades, many scholars have been seeking an optimal method to enhance the bond strength of resin to human dentine. However, little improvement has been achieved. In this study, pulse Nd:YAG laser was studied as a pretreatment method for dentine adhesion. Two-hundred ten freshly extracted, caries-free human premolars were used in this study, which was conducted after approval from the IRB. Ninety of them were selected and randomly divided into nine groups, according to parameter combinations of pulse Nd:YAG laser. Tensile-bond strength was tested, and the laser parameter combination was optimized for later experiments. The other teeth were randomly divided into six groups: laser-irradiated, acid-etched, laser + acid, 10-3 solution, laser + 10-3 solution, and negative control (unconditioned). Each group had 20 specimens: 10 for tensile-bond strength tests and the other 10 for microleakage examination. After the bond-strength test, the fractured surfaces were examined under scanning electronic microscopy. The bond strengths fluctuated with different laser-parameter combinations applied and showed significant differences in different laser-parameter groups (p < 0.01). The highest mean of tensile-bond strength was found in the group irradiated with the parameter combination of 1 W/15 Hz. In the contrasting experiments, the laser-irradiated group, the 10-3 solution group, and the laser + 10-3 solution groups showed higher tensile-bond strength and lower microleakage than did the other three groups (p < 0.05). Pulse Nd:YAG laser, 10-3 solution, and their combination showed favorable effects on bond strength and adaptation of resin to human dentine and can be used to pretreat dentine surfaces before adhesion. The optimal parameter combination of pulse Nd:YAG laser was determined to be 1 W/15 Hz in this study.
  Photomedicine and laser surgery 10/2010; 28(6):741-6. · 1.76 Impact Factor
• Article: Wound ballistics of the pig mandibular angle: a preliminary finite element analysis and experimental study.

  Yubin Chen, Yingyun Miao, Chuan Xu, Gang Zhang, Tao Lei, Yinghui Tan
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  ABSTRACT: To study wound ballistics of the mandibular angle, a combined hexahedral-tetrahedral finite element (FE) model of the pig mandible was developed to simulate ballistic impact. An experimental study was carried out by measuring impact load parameters from 14 fresh pig mandibles that were shot at the mandibular angle by a standard 7.62 mm M43 bullet. FE analysis was executed through the LS-DYNA code under impact loads similar to those obtained from the experimental study. The resulting residual velocity, the transferred energy from the bullet to the mandible, and the surface area of the entrance wound had no statistical differences between the FE simulation and the experimental study. However, the mean surface area of the exit wounds in the experimental study was significantly larger than that in the simulation. According to the FE analysis, the stress concentrated zones were mainly located at the region of impact, condylar neck, coronoid process and mandibular body. The simulation results also indicated that trabecular bone had less stress concentration and a lower speed of stress propagation compared with cortical bone. The FE model is appropriate and conforms to the basic principles of wound ballistics. This modeling system will be helpful for further investigations of the biomechanical mechanisms of wound ballistics.
  Journal of biomechanics 04/2010; 43(6):1131-7. · 2.66 Impact Factor